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  • 1. Abbasi, R.
    et al.
    Abdou, Y.
    Abu-Zayyad, T.
    Adams, J.
    Aguilar, J. A.
    Ahlers, M.
    Andeen, K.
    Auffenberg, J.
    Bai, X.
    Baker, M.
    Barwick, S. W.
    Bay, R.
    Alba, J. L. Bazo
    Beattie, K.
    Beatty, J. J.
    Bechet, S.
    Becker, J. K.
    Becker, K. -H
    Benabderrahmane, M. L.
    Berdermann, J.
    Berghaus, P.
    Berley, D.
    Bernardini, E.
    Bertrand, D.
    Besson, D. Z.
    Bissok, M.
    Blaufuss, E.
    Boersma, D. J.
    Bohm, C.
    Bolmont, J.
    Botner, O.
    Bradley, L.
    Braun, J.
    Breder, D.
    Castermans, T.
    Chirkin, D.
    Christy, B.
    Clem, J.
    Cohen, S.
    Cowen, D. F.
    D'Agostino, M. V.
    Danninger, M.
    Day, C. T.
    De Clercq, C.
    Demiroers, L.
    Depaepe, O.
    Descamps, F.
    Desiati, P.
    de Vries-Uiterweerd, G.
    DeYoung, T.
    Diaz-Velez, J. C.
    Dreyer, J.
    Dumm, J. P.
    Duvoort, M. R.
    Edwards, W. R.
    Ehrlich, R.
    Eisch, J.
    Ellsworth, R. W.
    Engdegard, O.
    Euler, S.
    Evenson, P. A.
    Fadiran, O.
    Fazely, A. R.
    Feusels, T.
    Filimonov, K.
    Finley, C.
    Foerster, M. M.
    Fox, B. D.
    Franckowiak, A.
    Franke, R.
    Gaisser, T. K.
    Gallagher, J.
    Ganugapati, R.
    Gerhardt, L.
    Gladstone, L.
    Goldschmidt, A.
    Goodman, J. A.
    Gozzini, R.
    Grant, D.
    Griesel, T.
    Gro, A.
    Grullon, S.
    Gunasingha, R. M.
    Gurtner, M.
    Ha, C.
    Hallgren, A.
    Halzen, F.
    Han, K.
    Hanson, K.
    Hasegawa, Y.
    Heise, J.
    Helbing, K.
    Herquet, P.
    Hickford, S.
    Hill, G. C.
    Hoffman, K. D.
    Hoshina, K.
    Hubert, D.
    Huelsnitz, W.
    Huelss, J. -P
    Hulth, P. O.
    Hultqvist, K.
    Hussain, S.
    Imlay, R. L.
    Inaba, M.
    Ishihara, A.
    Jacobsen, J.
    Japaridze, G. S.
    Johansson, H.
    Joseph, J. M.
    Kampert, K. -H
    Kappes, A.
    Karg, T.
    Karle, A.
    Kelley, J. L.
    Kenny, P.
    Kiryluk, J.
    Kislat, F.
    Klein, S. R.
    Knops, S.
    Kohnen, G.
    Kolanoski, H.
    Koepke, L.
    Kowalski, M.
    Kowarik, T.
    Krasberg, M.
    Kuehn, K.
    Kuwabara, T.
    Labare, M.
    Lafebre, S.
    Laihem, K.
    Landsman, H.
    Lauer, R.
    Lennarz, D.
    Lucke, A.
    Lundberg, J.
    Luenemann, J.
    Madsen, J.
    Majumdar, P.
    Maruyama, R.
    Mase, K.
    Matis, H. S.
    McParland, C. P.
    Meagher, K.
    Merck, M.
    Meszaros, P.
    Middell, E.
    Milke, N.
    Miyamoto, H.
    Mohr, A.
    Montaruli, T.
    Morse, R.
    Movit, S. M.
    Nahnhauer, R.
    Nam, J. W.
    Niessen, P.
    Nygren, D. R.
    Odrowski, S.
    Olivas, A.
    Olivo, M.
    Ono, M.
    Panknin, S.
    Patton, S.
    de los Heros, C. Perez
    Petrovic, J.
    Piegsa, A.
    Pieloth, D.
    Pohl, Arvid
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Porrata, R.
    Potthoff, N.
    Price, P. B.
    Prikockis, M.
    Przybylski, G. T.
    Rawlins, K.
    Redl, P.
    Resconi, E.
    Rhode, W.
    Ribordy, M.
    Rizzo, A.
    Rodrigues, J. P.
    Roth, P.
    Rothmaier, F.
    Rott, C.
    Roucelle, C.
    Rutledge, D.
    Ryckbosch, D.
    Sander, H. -G
    Sarkar, S.
    Schlenstedt, S.
    Schmidt, T.
    Schneider, D.
    Schukraft, A.
    Schulz, O.
    Schunck, M.
    Seckel, D.
    Semburg, B.
    Seo, S. H.
    Sestayo, Y.
    Seunarine, S.
    Silvestri, A.
    Slipak, A.
    Spiczak, G. M.
    Spiering, C.
    Stamatikos, M.
    Stanev, T.
    Stephens, G.
    Stezelberger, T.
    Stokstad, R. G.
    Stoufer, M. C.
    Stoyanov, S.
    Strahler, E. A.
    Straszheim, T.
    Sulanke, K. -H
    Sullivan, G. W.
    Swillens, Q.
    Taboada, I.
    Tamburro, A.
    Tarasova, O.
    Tepe, A.
    Ter-Antonyan, S.
    Terranova, C.
    Tilav, S.
    Toale, P. A.
    Tooker, J.
    Tosi, D.
    Turcan, D.
    van Eijndhoven, N.
    Vandenbroucke, J.
    Van Overloop, A.
    Voigt, B.
    Walck, C.
    Waldenmaier, T.
    Walter, M.
    Wendt, C.
    Westerhoff, S.
    Whitehorn, N.
    Wiebusch, C. H.
    Wiedemann, A.
    Wikstroem, G.
    Williams, D. R.
    Wischnewski, R.
    Wissing, H.
    Woschnagg, K.
    Xu, X. W.
    Yodh, G.
    Yoshida, S.
    Search for muon neutrinos from gamma-ray bursts with the IceCube neutrino telescope2010In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 710, no 1, p. 346-359Article in journal (Refereed)
    Abstract [en]

    We present the results of searches for high-energy muon neutrinos from 41 gamma-ray bursts (GRBs) in the northern sky with the IceCube detector in its 22 string configuration active in 2007/2008. The searches cover both the prompt and a possible precursor emission as well as a model-independent, wide time window of -1 hr to + 3 hr around each GRB. In contrast to previous searches with a large GRB population, we do not utilize a standard Waxman-Bahcall GRB flux for the prompt emission but calculate individual neutrino spectra for all 41 GRBs from the burst parameters measured by satellites. For all of the three time windows, the best estimate for the number of signal events is zero. Therefore, we place 90% CL upper limits on the fluence from the prompt phase of 3.7 x 10(-3) erg cm(-2) (72 TeV-6.5 PeV) and on the fluence from the precursor phase of 2.3 x 10(-3) erg cm(-2) (2.2-55 TeV), where the quoted energy ranges contain 90% of the expected signal events in the detector. The 90% CL upper limit for the wide time window is 2.7 x 10(-3) erg cm(-2) (3 TeV-2.8 PeV) assuming an E-2 flux.

  • 2. Abbasi, R.
    et al.
    Abdou, Y.
    Abu-Zayyad, T.
    Adams, J.
    Aguilar, J. A.
    Ahlers, M.
    Andeen, K.
    Auffenberg, J.
    Bai, X.
    Baker, M.
    Barwick, S. W.
    Bay, R.
    Alba, J. L. Bazo
    Beattie, K.
    Beatty, J. J.
    Bechet, S.
    Becker, J. K.
    Becker, K. -H
    Benabderrahmane, M. L.
    Berdermann, J.
    Berghaus, P.
    Berley, D.
    Bernardini, E.
    Bertrand, D.
    Besson, D. Z.
    Bissok, M.
    Blaufuss, E.
    Boersma, D. J.
    Bohm, C.
    Bolmont, J.
    Botner, O.
    Bradley, L.
    Braun, J.
    Breder, D.
    Castermans, T.
    Chirkin, D.
    Christy, B.
    Clem, J.
    Cohen, S.
    Cowen, D. F.
    D'Agostino, M. V.
    Danninger, M.
    Day, C. T.
    De Clercq, C.
    Demiroers, L.
    Depaepe, O.
    Descamps, F.
    Desiati, P.
    de Vries-Uiterweerd, G.
    DeYoung, T.
    Diaz-Velez, J. C.
    Dreyer, J.
    Dumm, J. P.
    Duvoort, M. R.
    Edwards, W. R.
    Ehrlich, R.
    Eisch, J.
    Ellsworth, R. W.
    Engdegard, O.
    Euler, S.
    Evenson, P. A.
    Fadiran, O.
    Fazely, A. R.
    Feusels, T.
    Filimonov, K.
    Finley, C.
    Foerster, M. M.
    Fox, B. D.
    Franckowiak, A.
    Franke, R.
    Gaisser, T. K.
    Gallagher, J.
    Ganugapati, R.
    Gerhardt, L.
    Gladstone, L.
    Goldschmidt, A.
    Goodman, J. A.
    Gozzini, R.
    Grant, D.
    Griesel, T.
    Gross, A.
    Grullon, S.
    Gunasingha, R. M.
    Gurtner, M.
    Ha, C.
    Hallgren, A.
    Halzen, F.
    Han, K.
    Hanson, K.
    Hasegawa, Y.
    Heise, J.
    Helbing, K.
    Herquet, P.
    Hickford, S.
    Hill, G. C.
    Hoffman, K. D.
    Hoshina, K.
    Hubert, D.
    Huelsnitz, W.
    Huelss, J. -P
    Hulth, P. O.
    Hultqvist, K.
    Hussain, S.
    Imlay, R. L.
    Inaba, M.
    Ishihara, A.
    Jacobsen, J.
    Japaridze, G. S.
    Johansson, H.
    Joseph, J. M.
    Kampert, K. -H
    Kappes, A.
    Karg, T.
    Karle, A.
    Kelley, J. L.
    Kenny, P.
    Kiryluk, J.
    Kislat, F.
    Klein, S. R.
    Knops, S.
    Kohnen, G.
    Kolanoski, H.
    Koepke, L.
    Kowalski, M.
    Kowarik, T.
    Krasberg, M.
    Kuehn, K.
    Kuwabara, T.
    Labare, M.
    Lafebre, S.
    Laihem, K.
    Landsman, H.
    Lauer, R.
    Lennarz, D.
    Lucke, A.
    Lundberg, J.
    Luenemann, J.
    Madsen, J.
    Majumdar, P.
    Maruyama, R.
    Mase, K.
    Matis, H. S.
    McParland, C. P.
    Meagher, K.
    Merck, M.
    Meszaros, P.
    Middell, E.
    Milke, N.
    Miyamoto, H.
    Mohr, A.
    Montaruli, T.
    Morse, R.
    Movit, S. M.
    Muenich, K.
    Nahnhauer, R.
    Nam, J. W.
    Niessen, P.
    Nygren, D. R.
    Odrowski, S.
    Olivas, A.
    Olivo, M.
    Ono, M.
    Panknin, S.
    Patton, S.
    de los Heros, C. Perez
    Petrovic, J.
    Piegsa, A.
    Pieloth, D.
    Pohl, Arvid
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Porrata, R.
    Potthoff, N.
    Price, P. B.
    Prikockis, M.
    Przybylski, G. T.
    Rawlins, K.
    Redl, P.
    Resconi, E.
    Rhode, W.
    Ribordy, M.
    Rizzo, A.
    Rodrigues, J. P.
    Roth, P.
    Rothmaier, F.
    Rott, C.
    Roucelle, C.
    Rutledge, D.
    Ryckbosch, D.
    Sander, H. -G
    Sarkar, S.
    Schlenstedt, S.
    Schmidt, T.
    Schneider, D.
    Schukraft, A.
    Schulz, O.
    Schunck, M.
    Seckel, D.
    Semburg, B.
    Seo, S. H.
    Sestayo, Y.
    Seunarine, S.
    Silvestri, A.
    Slipak, A.
    Spiczak, G. M.
    Spiering, C.
    Stamatikos, M.
    Stanev, T.
    Stephens, G.
    Stezelberger, T.
    Stokstad, R. G.
    Stoufer, M. C.
    Stoyanov, S.
    Strahler, E. A.
    Straszheim, T.
    Sulanke, K. -H
    Sullivan, G. W.
    Swillens, Q.
    Taboada, I.
    Tamburro, A.
    Tarasova, O.
    Tepe, A.
    Ter-Antonyan, S.
    Terranova, C.
    Tilav, S.
    Toale, P. A.
    Tosi, D.
    Turcan, D.
    van Eijndhoven, N.
    Vandenbroucke, J.
    Van Overloop, A.
    Voigt, B.
    Walck, C.
    Waldenmaier, T.
    Walter, M.
    Wendt, C.
    Westerhoff, S.
    Whitehorn, N.
    Wiebusch, C. H.
    Wiedemann, A.
    Wikstrom, G.
    Williams, D. R.
    Wischnewski, R.
    Wissing, H.
    Woschnagg, K.
    Xu, X. W.
    Yodh, G.
    Yoshida, S.
    SEARCH FOR HIGH-ENERGY MUON NEUTRINOS FROM THE "NAKED-EYE" GRB 080319B WITH THE IceCube NEUTRINO TELESCOPE2009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 701, no 2, p. 1721-1731Article in journal (Refereed)
    Abstract [en]

    We report on a search with the IceCube detector for high-energy muon neutrinos from GRB 080319B, one of the brightest gamma-ray bursts (GRBs) ever observed. The fireball model predicts that a mean of 0.1 events should be detected by IceCube for a bulk Lorentz boost of the jet of 300. In both the direct on-time window of 66 s and an extended window of about 300 s around the GRB, no excess was found above background. The 90% CL upper limit on the number of track-like events from the GRB is 2.7, corresponding to a muon neutrino fluence limit of 9.5 x 10(-3) erg cm(-2) in the energy range between 120 TeV and 2.2 PeV, which contains 90% of the expected events.

  • 3.
    Abdalla, H.
    et al.
    Univ Namibia, Namibia.
    Aharonian, F.
    Dublin Inst Adv Studies, Ireland;Max Planck Inst Kernphys, Germany;RAU, High Energy Astrophys Lab, Armenia.
    Ait Benkhali, F.
    Max Planck Inst Kernphys, Germany.
    Anguner, E. O.
    Aix Marseille Univ, CPPM, CNRS, France.
    Arcaro, C.
    North West Univ, South Africa.
    Armand, C.
    Univ Savoie Mont Blanc, Univ Grenoble Alpes, CNRS,LAPP, France.
    Armstrong, T.
    Univ Oxford, UK.
    Ashkar, H.
    Univ Paris Saclay, France.
    Backes, M.
    Univ Namibia, Namibia;North West Univ, South Africa.
    Baghmanyan, V.
    Inst Fizyki Jadrowej PAN, Poland.
    Barbosa-Martins, V.
    DESY, Germany.
    Barnacka, A.
    Uniwersytet Jagiellonski, Poland.
    Barnard, M.
    North West Univ, South Africa.
    Becherini, Yvonne
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Berge, D.
    DESY, Germany.
    Bernloehr, K.
    Max Planck Inst Kernphys, Germany.
    Bi, B.
    Univ Tubingen, Germany.
    Bottcher, M.
    North West Univ, South Africa.
    Boisson, C.
    Univ Paris, Univ PSL, France.
    Bolmont, J.
    Univ Paris Diderot, Sorbonne Univ, France.
    de Bony de Lavergne, M.
    Univ Savoie Mont Blanc, Univ Grenoble Alpes, CNRS,LAPP, France.
    Breuhaus, M.
    Max Planck Inst Kernphys, Germany.
    Brose, R.
    Dublin Inst Adv Studies, Ireland.
    Brun, F.
    Univ Paris Saclay, France.
    Bulik, T.
    Univ Warsaw, Poland.
    Bylund, Tomas
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Cangemi, F.
    Univ Paris Diderot, Sorbonne Univ, France.
    Caroff, S.
    Univ Paris Diderot, Sorbonne Univ, France.
    Casanova, S.
    Max Planck Inst Kernphys, Germany;Inst Fizyki Jadrowej PAN, Poland.
    Chambery, P.
    Uniwersytet Jagiellonski, Obserwatorium Astron, Poland.
    Catalano, J.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Chand, T.
    North West Univ, South Africa.
    Chen, A.
    Univ Witwatersrand, South Africa.
    Cotter, G.
    Univ Oxford, UK.
    Curylo, M.
    Univ Warsaw, Poland.
    Dalgleish, H.
    Univ Namibia, Namibia;North West Univ, South Africa.
    Mbarubucyeye, J. Damascene
    DESY, Germany.
    Davids, I. D.
    Univ Namibia, Namibia.
    Davies, J.
    Univ Oxford, UK.
    Devin, J.
    Univ Paris, CNRS, France.
    Djannati-Atai, A.
    Univ Paris, CNRS, France.
    Dmytriiev, A.
    Univ Paris, Univ PSL, France.
    Donath, A.
    Max Planck Inst Kernphys, Germany.
    Doroshenko, V.
    Univ Tubingen, Germany.
    Dreyer, L.
    North West Univ, South Africa.
    du Plessis, L.
    North West Univ, South Africa.
    Duffy, C.
    Univ Leicester, UK.
    Egberts, K.
    Univ Potsdam, Germany.
    Einecke, S.
    Univ Adelaide, Australia.
    Emery, G.
    Univ Paris Diderot, Sorbonne Univ, France.
    Ernenwein, J. -P
    Feijen, K.
    Univ Adelaide, Australia.
    Fegan, S.
    Ecole Polytech, CNRS, France.
    Fiasson, A.
    Univ Savoie Mont Blanc, Univ Grenoble Alpes, CNRS,LAPP, France.
    de Clairfontaine, G. Fichet
    Univ Paris, Univ PSL, CNRS, France.
    Fontaine, G.
    Ecole Polytech, CNRS, France.
    Funk, S.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Fuessling, M.
    DESY, Germany.
    Gabici, S.
    Univ Paris, CNRS, France.
    Gallant, Y. A.
    Univ Montpellier, France.
    Ghafourizade, S.
    Heidelberg Univ, Germany.
    Giavitto, G.
    DESY, Germany.
    Giunti, L.
    Univ Paris Saclay, IRFU, CEA, France;Univ Paris, CNRS, France.
    Glawion, D.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Glicenstein, J. F.
    Univ Paris Saclay, IRFU, CEA, France.
    Grondin, M. -H
    Hattingh, S.
    North West Univ, South Africa.
    Haupt, M.
    DESY, Germany.
    Hermann, G.
    Max Planck Inst Kernphys, Germany.
    Hinton, J. A.
    Max Planck Inst Kernphys, Germany.
    Hofmann, W.
    Max Planck Inst Kernphys, Germany.
    Hoischen, C.
    Univ Potsdam, Germany.
    Holch, T. L.
    DESY, Germany.
    Holler, M.
    Leopold Franzens Univ Innsbruck, Austria.
    Horbe, M.
    Univ Oxford, UK.
    Horns, D.
    Univ Hamburg, Germany.
    Huang, Z.
    Max Planck Inst Kernphys, Germany.
    Huber, D.
    Leopold Franzens Univ Innsbruck, Austria.
    Jamrozy, M.
    Uniwersytet Jagiellonski, Poland.
    Jankowsky, D.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Jankowsky, F.
    Heidelberg Univ, Landessternwarte, Germany.
    Joshi, V.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Jung-Richardt, I.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Kasai, E.
    Univ Namibia, Namibia.
    Katarzynski, K.
    Nicolaus Copernicus Univ, Poland.
    Katz, U.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Khangulyan, D.
    Rikkyo Univ, Japan.
    Khelifi, B.
    Univ Paris, CNRS, France.
    Klepser, S.
    DESY, Germany.
    Kluzniak, W.
    Polish Acad Sci, Poland.
    Komin, Nu.
    Univ Witwatersrand, South Africa.
    Konno, R.
    DESY, Germany.
    Kosack, K.
    Univ Paris Saclay, IRFU, CEA, France.
    Kostunin, D.
    DESY, Germany.
    Kreter, M.
    North West Univ, South Africa.
    Kukec Mezek, Gasper
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Kundu, A.
    North West Univ, South Africa.
    Lamanna, G.
    Univ Savoie Mont Blanc, Univ Grenoble Alpes, CNRS,LAPP, France..
    Le Stum, S.
    Aix Marseille Univ, CPPM, CNRS, France.
    Lemiere, A.
    Univ Paris, CNRS, France.
    Lemoine-Goumard, M.
    Univ Bordeaux, CNRS, IN2P3, France.
    Lenain, J. -P
    Leuschner, F.
    Univ Tubingen, Germany.
    Levy, C.
    Univ Paris Diderot, Sorbonne Univ, France.
    Luashvili, A.
    Univ Paris, Univ PSL, France.
    Lohse, T.
    Humboldt Univ, Germany.
    Lypova, I.
    DESY, Germany.
    Mackey, J.
    Dublin Inst Adv Studies, Ireland.
    Majumdar, J.
    DESY, Germany.
    Malyshev, D.
    Univ Tubingen, Germany;Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Marandon, V.
    Max Planck Inst Kernphys, Germany.
    Marchegiani, P.
    Univ Witwatersrand, South Africa.
    Marcowith, A.
    Univ Montpellier, France.
    Mares, A.
    Univ Bordeaux, France.
    Marti-Devesa, G.
    Leopold Franzens Univ Innsbruck, Austria.
    Marx, R.
    Max Planck Inst Kernphys, Germany;Heidelberg Univ, Germany.
    Maurin, G.
    Univ Savoie Mont Blanc, Univ Grenoble Alpes, CNRS,LAPP, France.
    Meintjes, P. J.
    Univ Free State, South Africa.
    Meyer, M.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Mitchell, A.
    Max Planck Inst Kernphys, Germany.
    Moderski, R.
    Polish Acad Sci, Poland.
    Mohrmann, L.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Montanari, A.
    Univ Paris Saclay, IRFU, CEA, France.
    Moore, C.
    Univ Leicester, Dept Phys & Astron, Univ Rd, Leicester LE1 7RH, Leics, England..
    Morris, P.
    Univ Oxford, UK.
    Moulin, E.
    Univ Paris Saclay, IRFU, CEA, France.
    Muller, J.
    Ecole Polytech, CNRS, France.
    Murach, T.
    DESY, Germany.
    Nakashima, K.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Nayerhoda, A.
    Inst Fizyki Jadrowej PAN, Poland.
    de Naurois, M.
    Ecole Polytech, CNRS, France.
    Ndiyavala, H.
    North West Univ, South Africa.
    Niemiec, J.
    Inst Fizyki Jadrowej PAN, Poland.
    Noel, A.
    Uniwersytet Jagiellonski, Obserwatorium Astron, Poland.
    Oberholzer, L.
    North West Univ, South Africa.
    O'Brien, P.
    Univ Leicester, UK.
    Ohm, S.
    DESY, Germany.
    Olivera-Nieto, L.
    Max Planck Inst Kernphys, Germany.
    de Ona Wilhelmi, E.
    DESY, Germany.
    Ostrowski, M.
    Uniwersytet Jagiellonski, Poland.
    Panter, M.
    Max Planck Inst Kernphys, Germany.
    Panny, S.
    Leopold Franzens Univ Innsbruck, Austria.
    Parsons, R. D.
    Humboldt Univ, Germany.
    Peron, G.
    Max Planck Inst Kernphys, Germany.
    Pita, S.
    Univ Paris, CNRS, France.
    Poireau, V.
    Univ Savoie Mont Blanc, Unv Grenoble Alpes, CNRS,LAPP, France.
    Prokhorov, D. A.
    Univ Amsterdam, Netherlands.
    Prokoph, H.
    DESY, Germany.
    Puhlhoefer, G.
    Univ Tubingen, Germany.
    Punch, Michael
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering. Univ Paris, CNRS, Astroparticule & Cosmol, F-75013 Paris, France..
    Quirrenbach, A.
    Heidelberg Univ, Germany.
    Reichherzer, P.
    Univ Paris Saclay, IRFU, CEA, France.
    Reimer, A.
    Leopold Franzens Univ Innsbruck, Austria.
    Reimer, O.
    Leopold Franzens Univ Innsbruck, Austria.
    Remy, Q.
    Max Planck Inst Kernphys, Germany.
    Renaud, M.
    Univ Montpellier, France.
    Rieger, F.
    Max Planck Inst Kernphys, Germany.
    Romoli, C.
    Max Planck Inst Kernphys, Germany.
    Rowell, G.
    Univ Adelaide, Australia.
    Rudak, B.
    Polish Acad Sci, Poland.
    Rueda Ricarte, H.
    Univ Paris Saclay, IRFU, CEA, France.
    Ruiz-Velasco, E.
    Max Planck Inst Kernphys, Germany.
    Sahakian, V.
    Yerevan Phys Inst, Armenia.
    Sailer, S.
    Max Planck Inst Kernphys, Germany.
    Salzmann, H.
    Univ Tubingen, Germany.
    Sanchez, D. A.
    Univ Savoie Mont Blanc, Univ Grenoble Alpes, CNRS,LAPP, France.
    Santangelo, A.
    Univ Tubingen, Germany.
    Sasaki, M.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Schaefer, J.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Schussler, F.
    Univ Paris Saclay, IRFU, CEA, France.
    Schutte, H. M.
    North West Univ, South Africa.
    Schwanke, U.
    Senniappan, Mohanraj
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Seyffert, A. S.
    North West Univ, South Africa.
    Shapopi, J. N. S.
    Univ Namibia, Namibia.
    Shiningayamwe, K.
    Univ Namibia, Namibia.
    Simoni, R.
    Univ Amsterdam, Netherlands.
    Sinha, A.
    Univ Paris, CNRS, France.
    Spackman, H.
    Univ Oxford, UK.
    Sol, H.
    Univ Paris, Univ PSL, France.
    Specovius, A.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Spencer, S.
    Univ Oxford, UK.
    Spir-Jacob, M.
    Univ Paris, CNRS, France.
    Stawarz, L.
    Uniwersytet Jagiellonski, Poland.
    Sun, L.
    Univ Amsterdam, Netherlands.
    Steenkamp, R.
    Univ Namibia, Namibia.
    Stegmann, C.
    DESY, Germany;Univ Potsdam, Germany.
    Steinmassl, S.
    Max Planck Inst Kernphys, Germany.
    Steppa, C.
    Univ Potsdam, Germany.
    Takahashi, T.
    Univ Tokyo, Japan.
    Tanaka, T.
    Univ Sao Paulo, Brazil.
    Tavernier, T.
    Univ Paris Saclay, IRFU, CEA, France.
    Taylor, A. M.
    DESY, Germany.
    Terrier, R.
    Univ Paris, CNRS, France.
    Thorpe-Morgan, C.
    Univ Tubingen, Germany.
    Thiersen, J. H. E.
    North West Univ, South Africa.
    Tluczykont, M.
    Univ Hamburg, Germany.
    Tomankova, L.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Tsirou, M.
    Univ Montpellier, France.
    Tsuji, M.
    Rikkyo Univ, Japan.
    Tuffs, R.
    Max Planck Inst Kernphys, Germany.
    Uchiyama, Y.
    Rikkyo Univ, Japan.
    van der Walt, D. J.
    North West Univ, South Africa.
    van Eldik, C.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    van Rensburg, C.
    Univ Namibia, Namibia.
    van Soelen, B.
    Univ Free State, South Africa.
    Vasileiadis, G.
    Univ Montpellier, France.
    Veh, J.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Venter, C.
    North West Univ, South Africa.
    Vincent, P.
    Univ Paris Diderot, Sorbonne Univ, France.
    Viana, A.
    Univ Sao Paulo, Brazil.
    Vink, J.
    Univ Amsterdam, Netherlands.
    Voelk, H. J.
    Max Planck Inst Kernphys, Germany.
    Wagner, S. J.
    Heidelberg Univ, Germany.
    Werner, F.
    Max Planck Inst Kernphys, Germany.
    White, R.
    Max Planck Inst Kernphys, Germany.
    Wierzcholska, A.
    Inst Fizyki Jadrowej PAN, Poland;Heidelberg Univ, Landessternwarte, Germany.
    Wong, Yu Wun
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Yassin, H.
    North West Univ, South Africa.
    Yusafzai, A.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Zacharias, M.
    North West Univ, South Africa;Univ Paris, Univ PSL, France.
    Zanin, R.
    Max Planck Inst Kernphys, Germany.
    Zargaryan, D.
    Zdziarski, A. A.
    Polish Acad Sci, Poland.
    Zech, A.
    Univ Paris, Univ PSL, France.
    Zhu, S. J.
    DESY, Germany.
    Zmija, A.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Zorn, J.
    Max Planck Inst Kernphys, Germany.
    Zouari, S.
    Univ Leicester, UK.
    Zywucka, N.
    North West Univ, South Africa.
    Search for Dark Matter Annihilation Signals from Unidentified Fermi-LAT Objects with HESS2021In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 918, no 1, article id 17Article in journal (Refereed)
    Abstract [en]

    Cosmological N-body simulations show that Milky Way-sized galaxies harbor a population of unmerged dark matter (DM) subhalos. These subhalos could shine in gamma-rays and eventually be detected in gamma-ray surveys as unidentified sources. We performed a thorough selection among unidentified Fermi-Large Area Telescope Objects (UFOs) to identify them as possible tera-electron-volt-scale DM subhalo candidates. We search for very-high-energy (E greater than or similar to 100 GeV) gamma-ray emissions using H.E.S.S. observations toward four selected UFOs. Since no significant very-high-energy gamma-ray emission is detected in any data set of the four observed UFOs or in the combined UFO data set, strong constraints are derived on the product of the velocity-weighted annihilation cross section sigma v by the J factor for the DM models. The 95% confidence level observed upper limits derived from combined H.E.S.S. observations reach sigma vJ values of 3.7 x 10(-5) and 8.1 x 10(-6) GeV(2 )cm(-2 )s(-1) in the W (+) W (-) and tau (+) tau (-) channels, respectively, for a 1 TeV DM mass. Focusing on thermal weakly interacting massive particles, the H.E.S.S. constraints restrict the J factors to lie in the range 6.1 x 10(19)-2.0 x 10(21) GeV(2 )cm(-5) and the masses to lie between 0.2 and 6 TeV in the W (+) W (-) channel. For the tau (+) tau (-) channel, the J factors lie in the range 7.0 x 10(19)-7.1 x 10(20) GeV(2 )cm(-5) and the masses lie between 0.2 and 0.5 TeV. Assuming model-dependent predictions from cosmological N-body simulations on the J-factor distribution for Milky Way-sized galaxies, the DM models with masses >0.3 TeV for the UFO emissions can be ruled out at high confidence level.

  • 4.
    Abdalla, H.
    et al.
    North West Univ, South Africa.
    Aharonian, F.
    Max Planck Inst Kernphys, Germany;Dublin Inst Adv Studies, Ireland;Natl Acad Sci Republ Armenia, Armenia.
    Benkhali, F. Ait
    Max Planck Inst Kernphys, Germany.
    Anguner, E. O.
    Aix Marseille Univ, France.
    Arakawa, M.
    Rikkyo Univ, Japan.
    Arcaro, C.
    North West Univ, South Africa.
    Armand, C.
    Univ Savoie Mont Blanc, France.
    Arrieta, M.
    PSL Res Univ, France.
    Backes, M.
    North West Univ, South Africa;Univ Namibia, Namibia.
    Barnard, M.
    North West Univ, South Africa.
    Becherini, Yvonne
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Tjus, J. Becker
    Ruhr Univ Bochum, Inst Theoret Phys Lehrstuhl Weltraum & Astrophys, D-44780 Bochum, Germany..
    Berge, D.
    DESY, D-15738 Zeuthen, Germany..
    Bernhard, S.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Bernloehr, K.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Blackwell, R.
    Univ Adelaide, Sch Phys Sci, Adelaide, SA 5005, Australia..
    Bottcher, M.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Boisson, C.
    PSL Res Univ, CNRS, Univ Paris Diderot, LUTH,Observ Paris, 5 Pl Jules Janssen, F-92190 Meudon, France..
    Bolmont, J.
    UPMC Univ Paris 06, Univ Paris Diderot, LPNHE, Sorbonne Univ,CNRS,Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris 5, France..
    Bonnefoy, S.
    DESY, D-15738 Zeuthen, Germany..
    Bordas, P.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Bregeon, J.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS, IN2P3, CC72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    Brun, F.
    Univ Bordeaux, Ctr Etud Nucl Bordeaux Gradignan, CNRS, IN2P3, F-33175 Gradignan, France..
    Brun, P.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Bryan, M.
    Univ Amsterdam, Anton Pannekoek Inst Astron, GRAPPA, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands..
    Buechele, M.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Bulik, T.
    Univ Warsaw, Astron Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland..
    Bylund, Tomas
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Capasso, M.
    Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
    Caroff, S.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, IN2P3, F-91128 Palaiseau, France..
    Carosi, A.
    Univ Savoie Mont Blanc, Lab Annecy le Vieux Phys Particules, CNRS, IN2P3, F-74941 Annecy Le Vieux, France..
    Cerruti, M.
    UPMC Univ Paris 06, Univ Paris Diderot, LPNHE, Sorbonne Univ,CNRS,Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris 5, France..
    Chakraborty, N.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Chandra, S.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Chaves, R. C. G.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS, IN2P3, CC72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    Chen, A.
    Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa..
    Colafrancesco, S.
    Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa..
    Condon, B.
    Univ Bordeaux, Ctr Etud Nucl Bordeaux Gradignan, CNRS, IN2P3, F-33175 Gradignan, France..
    Davids, I. D.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek, Namibia..
    Deil, C.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Devin, J.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS, IN2P3, CC72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    deWilt, P.
    Univ Adelaide, Sch Phys Sci, Adelaide, SA 5005, Australia..
    Dirson, L.
    Univ Hamburg, Inst Expt Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany..
    Djannati-Atai, A.
    Univ Paris Diderot, Observ Paris, IN2P3, CNRS,APC,CEA Irfu,AstroParticule & Cosmol,Sorbonn, 10 Rue Alice Domon & Leonie, F-75205 Paris 13, France..
    Dmytriiev, A.
    PSL Res Univ, CNRS, Univ Paris Diderot, LUTH,Observ Paris, 5 Pl Jules Janssen, F-92190 Meudon, France..
    Donath, A.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Doroshenko, V
    Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
    Drury, L. O ' C
    Dyks, J.
    Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland..
    Egberts, K.
    Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany..
    Emery, G.
    UPMC Univ Paris 06, Univ Paris Diderot, LPNHE, Sorbonne Univ,CNRS,Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris 5, France..
    Ernenwein, J-P
    Aix Marseille Univ, CNRS, IN2P3, CPPM, Marseille, France..
    Eschbach, S.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Fegan, S.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, IN2P3, F-91128 Palaiseau, France..
    Fiasson, A.
    Univ Savoie Mont Blanc, Lab Annecy le Vieux Phys Particules, CNRS, IN2P3, F-74941 Annecy Le Vieux, France..
    Fontaine, G.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, IN2P3, F-91128 Palaiseau, France..
    Funk, S.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Fuessling, M.
    DESY, D-15738 Zeuthen, Germany..
    Gabici, S.
    Univ Paris Diderot, Observ Paris, IN2P3, CNRS,APC,CEA Irfu,AstroParticule & Cosmol,Sorbonn, 10 Rue Alice Domon & Leonie, F-75205 Paris 13, France..
    Gallant, Y. A.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS, IN2P3, CC72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    Gate, F.
    Univ Savoie Mont Blanc, Lab Annecy le Vieux Phys Particules, CNRS, IN2P3, F-74941 Annecy Le Vieux, France..
    Giavitto, G.
    DESY, D-15738 Zeuthen, Germany..
    Glawion, D.
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Glicenstein, J. F.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Gottschall, D.
    Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
    Grondin, M-H
    Univ Bordeaux, Ctr Etud Nucl Bordeaux Gradignan, CNRS, IN2P3, F-33175 Gradignan, France..
    Hahn, J.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Haupt, M.
    DESY, D-15738 Zeuthen, Germany..
    Heinzelmann, G.
    Univ Hamburg, Inst Expt Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany..
    Henri, G.
    Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France..
    Hermann, G.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Hinton, J. A.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Hofmann, W.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Hoischen, C.
    Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany..
    Holch, T. L.
    Humboldt Univ, Inst Phys, D-12489 Berlin, Germany..
    Holler, M.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Horns, D.
    Univ Hamburg, Inst Expt Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany..
    Huber, D.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Iwasaki, H.
    Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan..
    Jacholkowska, A.
    UPMC Univ Paris 06, Univ Paris Diderot, LPNHE, Sorbonne Univ,CNRS,Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris 5, France..
    Jamrozy, M.
    Uniwersytet Jagiellonski, Obserwatorium Astronomiczne, Ul Orla 171, PL-30244 Krakow, Poland..
    Jankowsky, D.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Jankowsky, F.
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Jouvin, L.
    Univ Paris Diderot, Observ Paris, IN2P3, CNRS,APC,CEA Irfu,AstroParticule & Cosmol,Sorbonn, 10 Rue Alice Domon & Leonie, F-75205 Paris 13, France..
    Jung-Richardt, I
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Kastendieck, M. A.
    Univ Hamburg, Inst Expt Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany..
    Katarzynski, K.
    Nicolaus Copernicus Univ, Fac Phys Astron & Informat, Ctr Astron, Grudziadzka 5, PL-87100 Torun, Poland..
    Katsuragawa, M.
    Univ Tokyo, Kavli IPMU, UTIAS, 5-1-5 Kashiwa No Ha, Kashiwa, Chiba 2778583, Japan..
    Katz, U.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Kerszberg, D.
    UPMC Univ Paris 06, Univ Paris Diderot, LPNHE, Sorbonne Univ,CNRS,Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris 5, France..
    Khangulyan, D.
    Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan..
    Khelifi, B.
    Univ Paris Diderot, Observ Paris, IN2P3, CNRS,APC,CEA Irfu,AstroParticule & Cosmol,Sorbonn, 10 Rue Alice Domon & Leonie, F-75205 Paris 13, France..
    King, J.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Klepser, S.
    DESY, D-15738 Zeuthen, Germany..
    Kluzniak, W.
    Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland..
    Komin, Nu
    Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa..
    Kosack, K.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Krakau, S.
    Ruhr Univ Bochum, Inst Theoret Phys Lehrstuhl Weltraum & Astrophys, D-44780 Bochum, Germany..
    Kraus, M.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Kruger, P. P.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Lamanna, G.
    Univ Savoie Mont Blanc, Lab Annecy le Vieux Phys Particules, CNRS, IN2P3, F-74941 Annecy Le Vieux, France..
    Lau, J.
    Univ Adelaide, Sch Phys Sci, Adelaide, SA 5005, Australia..
    Lefaucheur, J.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Lemiere, A.
    Univ Paris Diderot, Observ Paris, IN2P3, CNRS,APC,CEA Irfu,AstroParticule & Cosmol,Sorbonn, 10 Rue Alice Domon & Leonie, F-75205 Paris 13, France..
    Lemoine-Goumard, M.
    Univ Bordeaux, Ctr Etud Nucl Bordeaux Gradignan, CNRS, IN2P3, F-33175 Gradignan, France..
    Lenain, J-P
    UPMC Univ Paris 06, Univ Paris Diderot, LPNHE, Sorbonne Univ,CNRS,Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris 5, France..
    Leser, E.
    Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany..
    Lohse, T.
    Humboldt Univ, Inst Phys, D-12489 Berlin, Germany..
    Lorentz, M.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Lopez-Coto, R.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Lypova, I
    DESY, D-15738 Zeuthen, Germany..
    Malyshev, D.
    Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
    Marandon, V
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Marcowith, A.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS, IN2P3, CC72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    Mariaud, C.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, IN2P3, F-91128 Palaiseau, France..
    Marti-Devesa, G.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Marx, R.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Maurin, G.
    Univ Savoie Mont Blanc, Lab Annecy le Vieux Phys Particules, CNRS, IN2P3, F-74941 Annecy Le Vieux, France..
    Meintjes, P. J.
    Univ Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa..
    Mitchell, A. M. W.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Moderski, R.
    Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland..
    Mohamed, M.
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Mohrmann, L.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Moulin, E.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Murach, T.
    DESY, D-15738 Zeuthen, Germany..
    Nakashima, S.
    RIKEN, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    de Naurois, M.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, IN2P3, F-91128 Palaiseau, France..
    Ndiyavala, H.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Niederwanger, F.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Niemiec, J.
    Inst Fizyki Jadrowej PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland..
    Oakes, L.
    Humboldt Univ, Inst Phys, D-12489 Berlin, Germany..
    O'Brien, P.
    Univ Leicester, Dept Phys & Astron, Univ Rd, Leicester LE1 7RH, Leics, England..
    Odaka, H.
    Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan..
    Ohm, S.
    DESY, D-15738 Zeuthen, Germany..
    Ostrowski, M.
    Uniwersytet Jagiellonski, Obserwatorium Astronomiczne, Ul Orla 171, PL-30244 Krakow, Poland..
    Oya, I
    DESY, D-15738 Zeuthen, Germany..
    Padovani, M.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS, IN2P3, CC72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    Panter, M.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Parsons, R. D.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Perennes, C.
    UPMC Univ Paris 06, Univ Paris Diderot, LPNHE, Sorbonne Univ,CNRS,Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris 5, France..
    Petrucci, P-O
    Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France..
    Peyaud, B.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Piel, Q.
    Univ Savoie Mont Blanc, Lab Annecy le Vieux Phys Particules, CNRS, IN2P3, F-74941 Annecy Le Vieux, France..
    Pita, S.
    Univ Paris Diderot, Observ Paris, IN2P3, CNRS,APC,CEA Irfu,AstroParticule & Cosmol,Sorbonn, 10 Rue Alice Domon & Leonie, F-75205 Paris 13, France..
    Poireau, V
    Univ Savoie Mont Blanc, Lab Annecy le Vieux Phys Particules, CNRS, IN2P3, F-74941 Annecy Le Vieux, France..
    Noel, A. Priyana
    Uniwersytet Jagiellonski, Obserwatorium Astronomiczne, Ul Orla 171, PL-30244 Krakow, Poland..
    Prokhorov, D.
    Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa..
    Prokoph, H.
    DESY, D-15738 Zeuthen, Germany..
    Puehlhofer, G.
    Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
    Punch, Michael
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering. Univ Paris Diderot, France.
    Quirrenbach, A.
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Raab, S.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Rauth, R.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Reimer, A.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Reimer, O.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Renaud, M.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS, IN2P3, CC72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    Rieger, F.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany.;ITA Univ Heidelberg, Heidelberg, Germany..
    Rinchiuso, L.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Romoli, C.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Rowell, G.
    Univ Adelaide, Sch Phys Sci, Adelaide, SA 5005, Australia..
    Rudak, B.
    Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland..
    Ruiz-Velasco, E.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Sahakian, V
    Natl Acad Sci Republ Armenia, Marshall Baghramian Ave 24, Yerevan 0019, Armenia.;Yerevan Phys Inst, Yerevan 375036, Armenia..
    Saito, S.
    Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan..
    Sanchez, D. A.
    Univ Savoie Mont Blanc, Lab Annecy le Vieux Phys Particules, CNRS, IN2P3, F-74941 Annecy Le Vieux, France..
    Santangelo, A.
    Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
    Sasaki, M.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Schlickeiser, R.
    Ruhr Univ Bochum, Inst Theoret Phys Lehrstuhl Weltraum & Astrophys, D-44780 Bochum, Germany..
    Schussler, F.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Schulz, A.
    DESY, D-15738 Zeuthen, Germany..
    Schwanke, U.
    Humboldt Univ, Inst Phys, D-12489 Berlin, Germany..
    Schwemmer, S.
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Seglar-Arroyo, M.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Senniappan, Mohanraj
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Seyffert, A. S.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Shafi, N.
    Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa..
    Shilon, I
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Shiningayamwe, K.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek, Namibia..
    Simoni, R.
    Univ Amsterdam, Anton Pannekoek Inst Astron, GRAPPA, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands..
    Sinha, A.
    Univ Paris Diderot, Observ Paris, IN2P3, CNRS,APC,CEA Irfu,AstroParticule & Cosmol,Sorbonn, 10 Rue Alice Domon & Leonie, F-75205 Paris 13, France..
    Sol, H.
    PSL Res Univ, CNRS, Univ Paris Diderot, LUTH,Observ Paris, 5 Pl Jules Janssen, F-92190 Meudon, France..
    Spanier, F.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Specovius, A.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Spir-Jacob, M.
    Univ Paris Diderot, Observ Paris, IN2P3, CNRS,APC,CEA Irfu,AstroParticule & Cosmol,Sorbonn, 10 Rue Alice Domon & Leonie, F-75205 Paris 13, France..
    Stawarz, L.
    Uniwersytet Jagiellonski, Obserwatorium Astronomiczne, Ul Orla 171, PL-30244 Krakow, Poland..
    Steenkamp, R.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek, Namibia..
    Stegmann, C.
    DESY, D-15738 Zeuthen, Germany.;Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany..
    Steppa, C.
    Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany..
    Takahashi, T.
    Univ Tokyo, Kavli IPMU, UTIAS, 5-1-5 Kashiwa No Ha, Kashiwa, Chiba 2778583, Japan..
    Tavernet, J-P
    UPMC Univ Paris 06, Univ Paris Diderot, LPNHE, Sorbonne Univ,CNRS,Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris 5, France..
    Tavernier, T.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Taylor, A. M.
    DESY, D-15738 Zeuthen, Germany..
    Terrier, R.
    Univ Paris Diderot, Observ Paris, IN2P3, CNRS,APC,CEA Irfu,AstroParticule & Cosmol,Sorbonn, 10 Rue Alice Domon & Leonie, F-75205 Paris 13, France..
    Tibaldo, L.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Tiziani, D.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Tluczykont, M.
    Univ Hamburg, Inst Expt Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany..
    Trichard, C.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, IN2P3, F-91128 Palaiseau, France..
    Tsirou, M.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS, IN2P3, CC72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    Tsuji, N.
    Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan..
    Tuffs, R.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Uchiyama, Y.
    Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan..
    van der Walt, D. J.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    van Eldik, C.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    van Rensburg, C.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    van Soelen, B.
    Univ Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa..
    Vasileiadis, G.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS, IN2P3, CC72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    Veh, J.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Venter, C.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Vincent, P.
    UPMC Univ Paris 06, Univ Paris Diderot, LPNHE, Sorbonne Univ,CNRS,Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris 5, France..
    Vink, J.
    Univ Amsterdam, Anton Pannekoek Inst Astron, GRAPPA, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands..
    Voisin, F.
    Univ Adelaide, Sch Phys Sci, Adelaide, SA 5005, Australia..
    Voelk, H. J.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Vuillaume, T.
    Univ Savoie Mont Blanc, Lab Annecy le Vieux Phys Particules, CNRS, IN2P3, F-74941 Annecy Le Vieux, France..
    Wadiasingh, Z.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Wagner, S. J.
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Wagner, R. M.
    Stockholm Univ, Albanova Univ Ctr, Oskar Klein Ctr, Dept Phys, SE-10691 Stockholm, Sweden..
    White, R.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Wierzcholska, A.
    Inst Fizyki Jadrowej PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland..
    Yang, R.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Zaborov, D.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, IN2P3, F-91128 Palaiseau, France..
    Zacharias, M.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Zanin, R.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Zdziarski, A. A.
    Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland..
    Zech, A.
    PSL Res Univ, CNRS, Univ Paris Diderot, LUTH,Observ Paris, 5 Pl Jules Janssen, F-92190 Meudon, France..
    Zefi, F.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, IN2P3, F-91128 Palaiseau, France..
    Ziegler, A.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Zorn, J.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Zywucka, N.
    Uniwersytet Jagiellonski, Obserwatorium Astronomiczne, Ul Orla 171, PL-30244 Krakow, Poland..
    The 2014TeV gamma-Ray Flare of Mrk 501 Seen with HESS: Temporal and Spectral Constraints on Lorentz Invariance Violation2019In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 870, no 2, article id 93Article in journal (Refereed)
    Abstract [en]

    The blazar Mrk 501 (z = 0.034) was observed at very-high-energy (VHE, E greater than or similar to 100 GeV) gamma-ray wavelengths during a bright flare on the night of 2014 June 23-24 (MJD 56832) with the H.E.S.S. phase-II array of Cherenkov telescopes. Data taken that night by H.E.S.S. at large zenith angle reveal an exceptional number of gamma-ray photons at multi-TeV energies, with rapid flux variability and an energy coverage extending significantly up to 20 TeV. This data set is used to constrain Lorentz invariance violation (LIV) using two independent channels: a temporal approach considers the possibility of an energy dependence in the arrival time of gamma-rays, whereas a spectral approach considers the possibility of modifications to the interaction of VHE gamma-rays with extragalactic background light (EBL) photons. The non-detection of energy-dependent time delays and the non-observation of deviations between the measured spectrum and that of a supposed power-law intrinsic spectrum with standard EBL attenuation are used independently to derive strong constraints on the energy scale of LIV (E-QG) in the subluminal scenario for linear and quadratic perturbations in the dispersion relation of photons. For the case of linear perturbations, the 95% confidence level limits obtained are E-QG,E-1 > 3.6 x 10(17) GeV using the temporal approach and E-QG,E-1 > 2.6 x 10(19) GeV using the spectral approach. For the case of quadratic perturbations, the limits obtained are E-QG,E-2 > 8.5 x 10(10) GeV using the temporal approach and E-QG,E-2 > 7.8 x 10(11) GeV using the spectral approach.

  • 5.
    Abdalla, H.
    et al.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek 10005, Namibia..
    Aharonian, F.
    Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland.;Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany.;RAU, High Energy Astrophys Lab, 123 Hovsep Emin St, Yerevan 0051, Armenia..
    Benkhali, F. Ait
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Anguner, E. O.
    Aix Marseille Univ, CPPM, CNRS IN2P3, Marseille, France..
    Arcaro, C.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Armand, C.
    Univ Grenoble Alpes, Univ Savoie Mt Blanc, Lab Annecy Phys Particules, LAPP,CNRS, F-74000 Annecy, France..
    Armstrong, T.
    Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
    Ashkar, H.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Backes, M.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek 10005, Namibia.;North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Baghmanyan, V
    Inst Fizyki Jadrowej PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland..
    Martins, V. Barbosa
    DESY, D-15738 Zeuthen, Germany..
    Barnacka, A.
    Uniwersytet Jagiellonski, Obserwatorium Astron, Ul Orla 171, PL-30244 Krakow, Poland..
    Barnard, M.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Becherini, Yvonne
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Berge, D.
    DESY, D-15738 Zeuthen, Germany..
    Bernloehr, K.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Bi, B.
    Inst Astron & Astrophys, Univ Tubingen, Sand 1, D-72076 Tubingen, Germany..
    Bottcher, M.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Boisson, C.
    Univ Paris, Univ PSL, Observ Paris, Lab Univers & Theories,CNRS, F-92190 Meudon, France..
    Bolmont, J.
    Univ Paris Diderot, Sorbonne Univ, Lab Phys Nucl & Hautes Energies, LPNHE,CNRS IN2P3,Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris, France..
    de Lavergne, M. de Bony
    Univ Grenoble Alpes, Univ Savoie Mt Blanc, Lab Annecy Phys Particules, LAPP,CNRS, F-74000 Annecy, France..
    Breuhaus, M.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Brose, R.
    Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland..
    Brun, F.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Brun, P.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Bryan, M.
    Univ Amsterdam, Anton Pannekoek Inst Astron, GRAPPA, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands..
    Buechele, M.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Bulik, T.
    Univ Warsaw, Astron Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland..
    Bylund, Tomas
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Cangemi, F.
    LPNHE, Hautes Energies, 4 Pl Jussieu, F-75252 Paris, France..
    Caroff, S.
    Univ Grenoble Alpes, Univ Savoie Mt Blanc, Lab Annecy Phys Particules, LAPP,CNRS, F-74000 Annecy, France..
    Carosi, A.
    Univ Grenoble Alpes, Univ Savoie Mt Blanc, Lab Annecy Phys Particules, LAPP,CNRS, F-74000 Annecy, France..
    Casanova, S.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany.;Inst Fizyki Jadrowej PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland..
    Chambery, P.
    Univ Bordeaux, Ctr Etud Nucl Bordeaux Gragnan, CNRS IN2P3, F-33175 Gradignan, France..
    Chand, T.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Chandra, S.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Chen, A.
    Univ Witwatersrand, Sch Phys, 1 Jan Smuts Ave, ZA-2050 Johannesburg, South Africa..
    Cotter, G.
    Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
    Curylo, M.
    Univ Warsaw, Astron Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland..
    Mbarubucyeye, J. Damascene
    DESY, D-15738 Zeuthen, Germany..
    Davids, I. D.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek 10005, Namibia..
    Davies, J.
    Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
    Deil, C.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Devin, J.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Dirson, L.
    Univ Hamburg, Inst Expt Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany..
    Djannati-Atai, A.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Dmytriiev, A.
    Univ Paris, Univ PSL, Observ Paris, Lab Univers & Theories,CNRS, F-92190 Meudon, France..
    Donath, A.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Doroshenko, V
    Inst Astron & Astrophys, Univ Tubingen, Sand 1, D-72076 Tubingen, Germany..
    Dreyer, L.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Duffy, C.
    Univ Leicester, Dept Phys & Astron, Univ Rd, Leicester LE1 7RH, Leics, England..
    Du Plessis, L.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Dyks, J.
    Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland..
    Egberts, K.
    Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany..
    Eichhorn, F.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Einecke, S.
    Univ Adelaide, Sch Phys Sci, Adelaide, SA 5005, Australia..
    Emery, G.
    Univ Paris Diderot, Sorbonne Univ, Lab Phys Nucl & Hautes Energies, LPNHE,CNRS IN2P3,Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris, France..
    Ernenwein, J-P
    Aix Marseille Univ, CPPM, CNRS IN2P3, Marseille, France..
    Feijen, K.
    Univ Adelaide, Sch Phys Sci, Adelaide, SA 5005, Australia..
    Fegan, S.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, Inst Polytech Paris, F-91128 Palaiseau, France..
    Fiasson, A.
    Univ Grenoble Alpes, Univ Savoie Mt Blanc, Lab Annecy Phys Particules, LAPP,CNRS, F-74000 Annecy, France..
    de Clairfontaine, G. Fichet
    Univ Paris, Univ PSL, Observ Paris, Lab Univers & Theories,CNRS, F-92190 Meudon, France..
    Fontaine, G.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, Inst Polytech Paris, F-91128 Palaiseau, France..
    Funk, S.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Fuessling, M.
    DESY, D-15738 Zeuthen, Germany..
    Gabici, S.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Gallant, Y. A.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS IN2P3, CC 72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    Ghafourizade, S.
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Giavitto, G.
    DESY, D-15738 Zeuthen, Germany..
    Giunti, L.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.;Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Glawion, D.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Glicenstein, J. F.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Grondin, M-H
    Univ Bordeaux, Ctr Etud Nucl Bordeaux Gradignan, CNRS IN2P3, F-33175 Gradignan, France..
    Hahn, J.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Haupt, M.
    DESY, D-15738 Zeuthen, Germany..
    Hattingh, S.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Hermann, G.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Hinton, J. A.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Hofmann, W.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Hoischen, C.
    Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany..
    Holch, T. L.
    DESY, D-15738 Zeuthen, Germany..
    Holler, M.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Horbe, M.
    Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
    Horns, D.
    Univ Hamburg, Inst Expt Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany..
    Huang, Z.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Huber, D.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Jamrozy, M.
    Uniwersytet Jagiellonski, Obserwatorium Astron, Ul Orla 171, PL-30244 Krakow, Poland..
    Jankowsky, D.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Jankowsky, F.
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Jardin-Blicq, A.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Joshi, V
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Jung-Richardt, I
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Kasai, E.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek 10005, Namibia..
    Kastendieck, M. A.
    Univ Hamburg, Inst Expt Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany..
    Katarzynski, K.
    Nicolaus Copernicus Univ, Fac Phys Astron & Informat, Inst Astron, Grudziadzka 5, PL-87100 Torun, Poland..
    Katz, U.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Khangulyan, D.
    Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan..
    Khelifi, B.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Klepser, S.
    DESY, D-15738 Zeuthen, Germany..
    Kluzniak, W.
    Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland..
    Komin, Nu
    Univ Witwatersrand, Sch Phys, 1 Jan Smuts Ave, ZA-2050 Johannesburg, South Africa..
    Konno, R.
    DESY, D-15738 Zeuthen, Germany..
    Kosack, K.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Kostunin, D.
    DESY, D-15738 Zeuthen, Germany..
    Kreter, M.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Kukec Mezek, Gasper
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Kundu, A.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Lamanna, G.
    Univ Grenoble Alpes, Univ Savoie Mt Blanc, Lab Annecy Phys Particules, LAPP,CNRS, F-74000 Annecy, France..
    Lemiere, A.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Lemoine-Goumard, M.
    Univ Bordeaux, Ctr Etud Nucl Bordeaux Gradignan, CNRS IN2P3, F-33175 Gradignan, France..
    Lenain, J-P
    Univ Paris Diderot, Sorbonne Univ, Lab Phys Nucl & Hautes Energies, LPNHE,CNRS IN2P3,Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris, France..
    Le Stum, S.
    Aix Marseille Univ, CPPM, CNRS IN2P3, Marseille, France..
    Leuschner, F.
    Inst Astron & Astrophys, Univ Tubingen, Sand 1, D-72076 Tubingen, Germany..
    Levy, C.
    Univ Paris Diderot, Sorbonne Univ, Lab Phys Nucl & Hautes Energies, LPNHE,CNRS IN2P3,Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris, France..
    Lohse, T.
    Humboldt Univ, Inst Phys, Newtonstr 15, D-12489 Berlin, Germany..
    Luashvili, A.
    Univ Paris, Univ PSL, Observ Paris, Lab Univers & Theories,CNRS, F-92190 Meudon, France..
    Lypova, I
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Mackey, J.
    Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland..
    Majumdar, J.
    DESY, D-15738 Zeuthen, Germany..
    Malyshev, D.
    Inst Astron & Astrophys, Univ Tubingen, Sand 1, D-72076 Tubingen, Germany.;Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Marandon, V
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Marchegiani, P.
    Univ Witwatersrand, Sch Phys, 1 Jan Smuts Ave, ZA-2050 Johannesburg, South Africa..
    Marcowith, A.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS IN2P3, CC 72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    Mares, A.
    Univ Bordeaux, Ctr Etud Nucl Bordeaux Gradignan, CNRS IN2P3, F-33175 Gradignan, France..
    Marti-Devesa, G.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Marx, R.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany.;Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Maurin, G.
    Univ Grenoble Alpes, Univ Savoie Mt Blanc, Lab Annecy Phys Particules, LAPP,CNRS, F-74000 Annecy, France..
    Meintjes, P. J.
    Univ Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa..
    Meyer, M.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Mitchell, A.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Moderski, R.
    Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland..
    Mohrmann, L.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Montanari, A.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Moore, C.
    Univ Leicester, Dept Phys & Astron, Univ Rd, Leicester LE1 7RH, Leics, England..
    Morris, P.
    Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
    Moulin, E.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Muller, J.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, Inst Polytech Paris, F-91128 Palaiseau, France..
    Murach, T.
    DESY, D-15738 Zeuthen, Germany..
    Nakashima, K.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Nayerhoda, A.
    Inst Fizyki Jadrowej PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland..
    de Naurois, M.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, Inst Polytech Paris, F-91128 Palaiseau, France..
    Ndiyavala, H.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Niemiec, J.
    Inst Fizyki Jadrowej PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland..
    Oakes, L.
    Humboldt Univ, Inst Phys, Newtonstr 15, D-12489 Berlin, Germany..
    O'Brien, P.
    Univ Leicester, Dept Phys & Astron, Univ Rd, Leicester LE1 7RH, Leics, England..
    Odaka, H.
    Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan..
    Ohm, S.
    DESY, D-15738 Zeuthen, Germany..
    Olivera-Nieto, L.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Wilhelmi, E. de Ona
    DESY, D-15738 Zeuthen, Germany..
    Ostrowski, M.
    Uniwersytet Jagiellonski, Obserwatorium Astron, Ul Orla 171, PL-30244 Krakow, Poland..
    Panny, S.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Panter, M.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Parsons, R. D.
    Humboldt Univ, Inst Phys, Newtonstr 15, D-12489 Berlin, Germany..
    Peron, G.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Peyaud, B.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Piel, Q.
    Univ Grenoble Alpes, Univ Savoie Mt Blanc, Lab Annecy Phys Particules, LAPP,CNRS, F-74000 Annecy, France..
    Pita, S.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Poireau, V
    Univ Grenoble Alpes, Univ Savoie Mt Blanc, Lab Annecy Phys Particules, LAPP,CNRS, F-74000 Annecy, France..
    Noel, A. Priyana
    Uniwersytet Jagiellonski, Obserwatorium Astron, Ul Orla 171, PL-30244 Krakow, Poland..
    Prokhorov, D. A.
    Univ Amsterdam, Anton Pannekoek Inst Astron, GRAPPA, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands..
    Prokoph, H.
    DESY, D-15738 Zeuthen, Germany..
    Puehlhofer, G.
    Inst Astron & Astrophys, Univ Tubingen, Sand 1, D-72076 Tubingen, Germany..
    Punch, Michael
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering. Univ Paris, France.
    Quirrenbach, A.
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Raab, S.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Rauth, R.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Reichherzer, P.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Reimer, A.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Reimer, O.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Remy, Q.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Renaud, M.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS IN2P3, CC 72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    Reville, B.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Rieger, F.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Rinchiuso, L.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Romoli, C.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Rowell, G.
    Univ Adelaide, Sch Phys Sci, Adelaide, SA 5005, Australia..
    Rudak, B.
    Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland..
    Ricarte, H. Rueda
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Ruiz-Velasco, E.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Sahakian, V
    Yerevan Phys Inst, 2 Alikhanian Bros St, Yerevan 375036, Armenia..
    Sailer, S.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Salzmann, H.
    Inst Astron & Astrophys, Univ Tubingen, Sand 1, D-72076 Tubingen, Germany..
    Sanchez, D. A.
    Univ Grenoble Alpes, Univ Savoie Mt Blanc, Lab Annecy Phys Particules, LAPP,CNRS, F-74000 Annecy, France..
    Santangelo, A.
    Inst Astron & Astrophys, Univ Tubingen, Sand 1, D-72076 Tubingen, Germany..
    Sasaki, M.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Schaefer, J.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Schussler, F.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Schutte, H. M.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Schwanke, U.
    Humboldt Univ, Inst Phys, Newtonstr 15, D-12489 Berlin, Germany..
    Seglar-Arroyo, M.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Senniappan, Mohanraj
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Seyffert, A. S.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Shafi, N.
    Univ Witwatersrand, Sch Phys, 1 Jan Smuts Ave, ZA-2050 Johannesburg, South Africa..
    Shapopi, J. N. S.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek 10005, Namibia..
    Shiningayamwe, K.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek 10005, Namibia..
    Simoni, R.
    Univ Amsterdam, Anton Pannekoek Inst Astron, GRAPPA, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands..
    Sinha, A.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Sol, H.
    Univ Paris, Univ PSL, Observ Paris, Lab Univers & Theories,CNRS, F-92190 Meudon, France..
    Spackman, H.
    Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
    Specovius, A.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Spencer, S.
    Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
    Spir-Jacob, M.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Stawarz, L.
    Uniwersytet Jagiellonski, Obserwatorium Astron, Ul Orla 171, PL-30244 Krakow, Poland..
    Sun, L.
    Univ Amsterdam, Anton Pannekoek Inst Astron, GRAPPA, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands..
    Steenkamp, R.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek 10005, Namibia..
    Stegmann, C.
    Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany.;IDESY, D-15738 Zeuthen, Germany..
    Steinmassl, S.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Steppa, C.
    Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany..
    Takahashi, T.
    Univ Tokyo, Univ Tokyo Inst Adv Study UTIAS, Kavli Inst Phys & Math Universe WPI, 5-1-5 Kashiwa No Ha, Kashiwa, Chiba 2778583, Japan..
    Tanaka, T.
    Konan Univ, Dept Phys, Higashinada Ku, 8-9-1 Okamoto, Kobe, Hyogo 6588501, Japan..
    Tavernier, T.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Taylor, A. M.
    DESY, D-15738 Zeuthen, Germany..
    Terrier, R.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa.;Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Thiersen, J. H. E.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa.;Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Thorpe-Morgan, C.
    Inst Astron & Astrophys, Univ Tubingen, Sand 1, D-72076 Tubingen, Germany..
    Tiziani, D.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Tluczykont, M.
    Univ Hamburg, Inst Expt Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany..
    Tomankova, L.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Trichard, C.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, Inst Polytech Paris, F-91128 Palaiseau, France..
    Tsirou, M.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Tsuji, N.
    Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan.;RIKEN, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Tuffs, R.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Uchiyama, Y.
    Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan..
    van der Walt, D. J.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    van Eldik, C.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    van Rensburg, C.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek 10005, Namibia..
    van Soelen, B.
    Univ Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa..
    Vasileiadis, G.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS IN2P3, CC 72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    Veh, J.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Venter, C.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Vincent, P.
    Univ Paris Diderot, Sorbonne Univ, Lab Phys Nucl & Hautes Energies, LPNHE,CNRS IN2P3,Sorbonne Paris Cite, 4 Pl Jussieu, F-75252 Paris, France..
    Vink, J.
    Univ Amsterdam, Anton Pannekoek Inst Astron, GRAPPA, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands..
    Voelk, H. J.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Wadiasingh, Z.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Wagner, S. J.
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Watson, J.
    Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
    Werner, F.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    White, R.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Wierzcholska, A.
    Inst Fizyki Jadrowej PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland.;Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    DeWilt, P.
    Univ Adelaide, Sch Phys Sci, Adelaide, SA 5005, Australia..
    Wong, Yu Wun
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Yassin, H.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Yusafzai, A.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Zacharias, M.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa.;Univ Paris, Univ PSL, Observ Paris, Lab Univers & Theories,CNRS, F-92190 Meudon, France..
    Zanin, R.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Zargaryan, D.
    Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland.;RAU, High Energy Astrophys Lab, 123 Hovsep Emin St, Yerevan 0051, Armenia..
    Zdziarski, A. A.
    Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland..
    Zech, A.
    Univ Paris, Univ PSL, Observ Paris, Lab Univers & Theories,CNRS, F-92190 Meudon, France..
    Zhu, S. J.
    DESY, D-15738 Zeuthen, Germany..
    Zorn, J.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Zouari, S.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Zywucka, N.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Searching for TeV Gamma-Ray Emission from SGR 1935+2154 during Its 2020 X-Ray and Radio Bursting Phase2021In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 919, no 2, article id 106Article in journal (Refereed)
    Abstract [en]

    Magnetar hyperflares are the most plausible explanation for fast radio bursts (FRBs)-enigmatic powerful radio pulses with durations of several milliseconds and high brightness temperatures. The first observational evidence for this scenario was obtained in 2020 April when an FRB was detected from the direction of the Galactic magnetar and soft gamma-ray repeater SGR 1935+2154. The FRB was preceded by two gamma-ray outburst alerts by the BAT instrument aboard the Swift satellite, which triggered follow-up observations by the High Energy Stereoscopic System (H.E.S.S.). H.E.S.S. observed SGR 1935+2154 for 2 hr on 2020 April 28. The observations are coincident with X-ray bursts from the magnetar detected by INTEGRAL and Fermi-GBM, thus providing the first very high energy gamma-ray observations of a magnetar in a flaring state. High-quality data acquired during these follow-up observations allow us to perform a search for short-time transients. No significant signal at energies E > 0.6 TeV is found, and upper limits on the persistent and transient emission are derived. We here present the analysis of these observations and discuss the obtained results and prospects of the H.E.S.S. follow-up program for soft gamma-ray repeaters.

  • 6.
    Abdalla, H.
    et al.
    Univ Namibia, Namibia.
    Aharonian, F.
    Dublin Inst Adv Studies, Ireland.;Max Planck Inst Nucl Phys, Germany.;RAU, High Energy Astrophys Lab, Armenia..
    Benkhali, F. Ait
    Max Planck Inst Nucl Phys, D-69117 Heidelberg, Germany..
    Anguner, E. O.
    Aix Marseille Univ, CPPM, France.
    Arcaro, C.
    North West Univ, South Africa.
    Armand, C.
    Univ Savoie Mt Blanc, LAPP, CNRS, Lab Annecy Phys Particules,Univ Grenoble Alpes, F-74000 Annecy, France..
    Armstrong, T.
    Univ Oxford, UK.
    Ashkar, H.
    Univ Paris Saclay, France.
    Backes, M.
    Univ Namibia, Namibia.;North West Univ, South Africa.
    Baghmanyan, V
    Inst Fizyki Jadrowej PAN, Poland.;Univ Wisconsin, USA.
    Martins, V. Barbosa
    DESY, Germany.
    Barnacka, A.
    Uniwersytet Jagiellonski, Poland.
    Barnard, M.
    North West Univ, South Africa.
    Becherini, Yvonne
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Berge, D.
    DESY, Germany.
    Bernlohr, K.
    Max Planck Inst Nucl Phys, Germany.
    Bi, B.
    Univ Tubingen, Germany.
    Bottcher, M.
    North West Univ, South Africa.
    Boisson, C.
    Univ Paris, France.
    Bolmont, J.
    Sorbonne Univ, Univ Paris Diderot, France.
    Lavergne, M. de Bonyde
    Univ Savoie Mt Blanc, LAPP, CNRS, France.
    Breuhaus, M.
    Max Planck Inst Nucl Phys, Germany.
    Brose, R.
    Dublin Inst Adv Studies, Ireland.
    Brun, F.
    Univ Paris Saclay, IRFU, CEA, France.;Shanghai Jiao Tong Univ, China;Shanghai Jiao Tong Univ, China.
    Brun, P.
    Univ Paris Saclay, IRFU, CEA, France.
    Bryan, M.
    Univ Amsterdam, Netherlands.
    Buechele, M.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Bulik, T.
    Univ Warsaw, Poland.
    Bylund, Tomas
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Caroff, S.
    Univ Savoie Mt Blanc, LAPP, CNRS, France.
    Carosi, A.
    Univ Savoie Mt Blanc, LAPP, CNRS, France.
    Chand, T.
    North West Univ, South Africa.
    Chandra, S.
    North West Univ, South Africa.
    Chen, A.
    Univ Witwatersrand, South Africa.
    Cotter, G.
    Univ Oxford, UK.
    Mbarubucyeye, J. Damascene
    DESY, Germany.
    Davids, I. D.
    Univ Namibia, Namibia.
    Davies, J.
    Univ Oxford, UK.
    Deil, C.
    Max Plank inst, Germany.
    Devin, J.
    Univ Paris, France.
    Dirson, L.
    Univ Hamburg, Germany.
    Djannati-Atai, A.
    Univ Paris, CNRS, France.
    Dmytriiev, A.
    Univ Paris, France.
    Donath, A.
    Max Planck Inst Nucl Phys, Germany.
    Doroshenko, V
    Univ Tubingen, Germany.
    Dreyer, L.
    North West Univ, South Africa.
    Duffy, C.
    Univ Leicester, UK.
    Dyks, J.
    Polish Acad Sci, Poland.
    Egberts, K.
    Univ Potsdam, Germany.
    Eichhorn, F.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Einecke, S.
    Univ Adelaide, Australia.
    Emery, G.
    Sorbonne Univ, Univ Paris Diderot, France.
    Ernenwein, J-P
    Aix Marseille Univ, France.
    Feijen, K.
    Univ Adelaide, Australia.
    Fegan, S.
    Ecole Polytech, France.
    Fiasson, A.
    Univ Savoie Mt Blanc, France.
    de Clairfontaine, G. Fichet
    Univ Paris, France.
    Fontaine, G.
    Ecole Polytech, France.
    Funk, S.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Fuessling, M.
    DESY, Germany.
    Gabici, S.
    Univ Paris, CNRS, France.
    Gallant, Y. A.
    Univ Montpellier, France.
    Giavitto, G.
    DESY, Germany.
    Giunti, L.
    Univ Paris Saclay, France.;Univ Paris, CNRS, France.
    Glawion, D.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Glicenstein, J. F.
    Univ Paris Saclay, IRFU, France.
    Gottschall, D.
    Univ Tubingen, Germany.
    Grondin, M-H
    Univ Bordeaux, France.
    Hahn, J.
    Max Planck Inst Nucl Phys, Germany.
    Haupt, M.
    DESY, Germany.
    Hermann, G.
    Max Planck Inst Nucl Phys, Germany.
    Hinton, J. A.
    Max Planck Inst Nucl Phys, Germany;Univ Wisconsin, USA.
    Hofmann, W.
    Max Planck Inst Nucl Phys, Germany.
    Hoischen, C.
    Univ Potsdam, Germany.
    Holch, T. L.
    DESY, Germany.
    Holler, M.
    Leopold Franzens Univ Innsbruck, Austria.
    Horbe, M.
    Univ Oxford, UK.
    Horns, D.
    Univ Hamburg, Germany.
    Huber, D.
    Leopold Franzens Univ Innsbruck, Austria.
    Jamrozy, M.
    Uniwersytet Jagiellonski, Poland.
    Jankowsky, D.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Jankowsky, F.
    Heidelberg Univ, Germany.
    Jung-Richardt, I
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Kasai, E.
    Univ Namibia, Namibia.
    Kastendieck, M. A.
    Univ Hamburg, Germany.
    Katarzynski, K.
    Nicolaus Copernicus Univ, Poland.
    Katz, U.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Khangulyan, D.
    Rikkyo Univ, Japan.
    Khelifi, B.
    Univ Paris, CNRS, France.
    Klepser, S.
    DESY, Germany.
    Komin, Nu
    Univ Witwatersrand, South Africa.
    Konno, R.
    DESY, Germany.
    Kosack, K.
    Univ Paris Saclay, France.
    Kostunin, D.
    DESY, Germany.
    Kreter, M.
    North West Univ, South Africa.
    Lamanna, G.
    Univ Savoie Mt Blanc, LAPP, CNRS, France.
    Lemiere, A.
    Univ Paris, CNRS, France.
    Lemoine-Goumard, M.
    Univ Bordeaux, France.
    Lenain, J-P
    Sorbonne Univ, Univ Paris Diderot, Sorbonne Paris Cite, CNRS IN2P3, France.
    Leuschner, F.
    Univ Tubingen, Germany.
    Levy, C.
    Sorbonne Univ, Univ Paris Diderot, France.
    Lohse, T.
    Humboldt Univ, Germany.
    Lypova, I
    DESY, Germany.
    Mackey, J.
    Dublin Inst Adv Studies, Ireland.
    Majumdar, J.
    DESY, Germany.
    Malyshev, D.
    Univ Tubingen, Germany;Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Marandon, V
    Max Planck Inst Nucl Phys, Germany;Univ Wisconsin,USA;Shanghai Jiao Tong Univ, China;Shanghai Jiao Tong Univ, China.
    Marchegiani, P.
    Univ Witwatersrand, South Africa.
    Marcowith, A.
    Univ Montpellier, France.
    Mares, A.
    Univ Bordeaux, France.
    Marti-Devesa, G.
    Leopold Franzens Univ Innsbruck, Austria.
    Marx, R.
    Max Planck Inst Nucl Phys, Germany.
    Maurin, G.
    Univ Savoie Mt Blanc, LAPP, CNRS, Univ Grenoble Alpes, France.
    Meintjes, P. J.
    Univ Free State, South Africa.
    Meyer, M.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Mitchell, A. M. W.
    Max Planck Inst Nucl Phys, Germany.
    Moderski, R.
    Polish Acad Sci, Poland.
    Mohrmann, L.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Montanari, A.
    Univ Paris Saclay, IRFU, CEA, France.
    Moore, C.
    Univ Leicester, UK.
    Morris, P.
    Univ Oxford, UK.
    Moulin, E.
    Univ Paris Saclay, IRFU, CEA, France.
    Muller, J.
    Ecole Polytech, France.
    Murach, T.
    DESY, Germany.
    Nakashima, K.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Nayerhoda, A.
    Inst Fizyki Jadrowej PAN, Poland;Polish Acad Sci, Poland.
    de Naurois, M.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, France.
    Ndiyavala, H.
    North West Univ, South Africa.
    Niemiec, J.
    Inst Fizyki Jadrowej PAN, Poland.
    Oakes, L.
    Humboldt Univ, Germany.
    Odaka, H.
    Univ Tokyo, Japan.
    Ohm, S.
    DESY, Germany.
    Olivera-Nieto, L.
    Max Planck Inst Nucl Phys, Germany;Univ Wisconsin, USA.
    Wilhelmi, E. de Ona
    DESY, Germany.
    Ostrowski, M.
    Uniwersytet Jagiellonski, Poland.
    Panter, M.
    Max Planck Inst Nucl Phys, Germany.
    Panny, S.
    Leopold Franzens Univ Innsbruck, Austria.
    Parsons, R. D.
    Humboldt Univ, Inst Phys, Germany.
    Peron, G.
    Max Planck Inst Nucl Phys, Germany.
    Peyaud, B.
    Univ Paris Saclay, IRFU, CEA, France.
    Piel, Q.
    Univ Savoie Mt Blanc, LAPP, CNRS, Univ Grenoble Alpes, France.
    Pita, S.
    Univ Paris, CNRS, Astroparticule & Cosmol, France.
    Poireau, V
    Univ Savoie Mt Blanc, LAPP, CNRS, Univ Grenoble Alpes, France.
    Noel, A. Priyana
    Uniwersytet Jagiellonski, Poland.
    Prokhorov, D. A.
    Univ Amsterdam, Netherlands.
    Prokoph, H.
    DESY, Germany.
    Puehlhofer, G.
    Univ Tubingen, Germany.
    Punch, Michael
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering. Univ Paris, France.
    Quirrenbach, A.
    Heidelberg Univ, Germany.
    Raab, S.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Rauth, R.
    Leopold Franzens Univ Innsbruck, Austria.
    Reichherzer, P.
    Univ Paris Saclay, France.
    Reimer, A.
    Leopold Franzens Univ Innsbruck, Austria.
    Reimer, O.
    Leopold Franzens Univ Innsbruck, Austria.
    Remy, Q.
    Max Planck Inst Nucl Phys, Germany.
    Renaud, M.
    Univ Montpellier, France.
    Rieger, F.
    Max Planck Inst Nucl Phys, Germany.
    Rinchiuso, L.
    Univ Paris Saclay, IRFU, CEA, France.
    Romoli, C.
    Max Planck Inst Nucl Phys, Germany.
    Rowell, G.
    Univ Adelaide, Australia.
    Rudak, B.
    Polish Acad Sci, Poland.
    Sahakian, V
    Yerevan Phys Inst, Armenia.
    Sailer, S.
    Max Planck Inst Nucl Phys, Germany.
    Salzmann, H.
    Univ Tubingen, Germany.
    Sanchez, D. A.
    Univ Savoie Mt Blanc, LAPP, CNRS, Univ Grenoble Alpes, France.
    Santangelo, A.
    Univ Tubingen, Germany.
    Sasaki, M.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Schaefer, J.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Schussler, F.
    Univ Paris Saclay, IRFU, CEA, France.
    Schutte, H. M.
    North West Univ, South Africa.
    Schwanke, U.
    Humboldt Univ, Germany.
    Seglar-Arroyo, M.
    Univ Paris Saclay, IRFU, CEA, France.
    Senniappan, Mohanraj
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Seyffert, A. S.
    North West Univ, South Africa.
    Shafi, N.
    Univ Witwatersrand, South Africa.
    Shapopi, J. N. S.
    Univ Namibia, Namibia.
    Shiningayamwe, K.
    Univ Namibia, Namibia.
    Simoni, R.
    Univ Amsterdam, Netherlands.
    Sinha, A.
    Univ Paris, CNRS, France.
    Sol, H.
    Univ Paris, France.
    Specovius, A.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Spencer, S.
    Univ Oxford, UK.
    Sun, L.
    Univ Amsterdam, Netherlands.
    Steenkamp, R.
    Univ Namibia, Namibia.
    Stegmann, C.
    DESY, Germany;Univ Potsdam, Germany.
    Steinmassl, S.
    Max Planck Inst Nucl Phys, Germany.
    Steppa, C.
    Univ Potsdam, Germany.
    Takahashi, T.
    Univ Tokyo, Japan.
    Tavernier, T.
    Univ Paris Saclay, IRFU, CEA, France.
    Taylor, A. M.
    DESY, Germany.
    Terrier, R.
    Univ Paris, CNRS, France.
    Thiersen, J. H. E.
    North West Univ, South Africa.
    Tiziani, D.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Tluczykont, M.
    Univ Hamburg, Germany.
    Tomankova, L.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Trichard, C.
    Ecole Polytech, France.
    Tsirou, M.
    Max Planck Inst Nucl Phys, Germany.
    Tuffs, R.
    Max Planck Inst Nucl Phys, Germany.
    Uchiyama, Y.
    Rikkyo Univ, Japan.
    van der Walt, D. J.
    North West Univ, South Africa.
    van Eldik, C.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    van Rensburg, C.
    Univ Namibia, Namibia.
    van Soelen, B.
    Univ Free State, South Africa.
    Vasileiadis, G.
    Univ Montpellier, France.
    Veh, J.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Venter, C.
    North West Univ, South Africa.
    Vincent, P.
    Sorbonne Univ, Univ Paris Diderot, France.
    Vink, J.
    Univ Amsterdam, Netherlands.
    Voelk, H. J.
    Max Planck Inst Nucl Phys, Germany.
    Wadiasingh, Z.
    North West Univ, South Africa.
    Wagner, S. J.
    Heidelberg Univ, Germany.
    Watson, J.
    Univ Oxford, UK.
    Werner, F.
    Max Planck Inst Nucl Phys, Germany.;Univ Wisconsin, USA.
    White, R.
    Max Planck Inst Nucl Phys, Germany.
    Wierzcholska, A.
    Inst Fizyki Jadrowej PAN, Poland;Heidelberg Univ, Germany.
    Wong, Yu Wun
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Yusafzai, A.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Zacharias, M.
    North West Univ, South Africa;Univ Paris, France.
    Zanin, R.
    Max Planck Inst Nucl Phys, Germany.
    Zargaryan, D.
    Dublin Inst Adv Studies, Ireland;RAU, Armenia.
    Zdziarski, A. A.
    Polish Acad Sci, Poland.
    Zech, A.
    Univ Paris, France.
    Zhu, S. J.
    DESY, Germany.
    Zmija, A.
    Friedrich Alexander Univ Erlangen Nurnberg, Germany.
    Zorn, J.
    Max Planck Inst Nucl Phys, Germany.
    Zouari, S.
    Univ Paris, CNRS, France.
    Zywucka, N.
    North West Univ, South Africa.
    Albert, A.
    Los Alamos Natl Lab, USA.
    Alfaro, R.
    Univ Nacl Autonoma Mexico, Mexico.
    Alvarez, C.
    Univ Autonoma Chiapas, Mexico.
    Arteaga-Velezquez, J. C.
    Univ Michoacana, Mexico.
    Arunbabu, K. P.
    Univ Nacl Autonoma Mexico, Mexico.
    Rojas, D. Avila
    Univ Nacl Autonoma Mexico, Mexico.
    Belmont-Moreno, E.
    Univ Nacl Autonoma Mexico, Mexico.
    BenZvi, S. Y.
    Univ Rochester, USA.
    Brisbois, C.
    Univ Maryland, USA.
    Caballero-Mora, K. S.
    Univ Autonoma Chiapas, Mexico.
    Capistran, T.
    Univ Nacl Autonoma Mexico, Mexico.
    Carraminana, A.
    Inst Nacl Astrofis Opt & Electr, Mexico.
    Casanova, S.
    Polish Acad Sci, Poland;Univ Wisconsin, USA.
    Cotti, U.
    Univ Michoacana, Mexico.
    Cotzomi, J.
    Benemarita Univ Autanoma Puebla, Mexico.
    Coutino de Leon, S.
    Inst Nacl Astrofis Opt & Electr, Mexico.
    De la Fuente, E.
    Univ Guadalajara, Mexico;Univ Tokyo, Japan.
    de Leon, C.
    Univ Michoacana, Mexico.
    Diaz Hernandez, R.
    Inst Nacl Astrofis Opt & Electr, Mexico.
    Diaz-Velez, J. C.
    Univ Guadalajara, Mexico.
    Dingus, B. L.
    Los Alamos Natl Lab, USA.
    DuVernois, M. A.
    Univ Wisconsin, USA.
    Durocher, M.
    Los Alamos Natl Lab, USA.
    Ellsworth, R. W.
    Univ Maryland, USA.
    Engel, K.
    Univ Maryland, USA.
    Espinoza, C.
    Univ Nacl Autonoma Mexico, Mexico.
    Fan, K. L.
    Univ Maryland, USA.
    Alonso, M. Fernandez
    Penn State Univ, USA.
    Fraija, N.
    Univ Nacl Autonoma Mexico, Mexico.
    Galvan-Gamez, A.
    Univ Nacl Autonoma Mexico, Mexico.
    Garcia, D.
    Univ Nacl Autonoma Mexico, Mexico.
    Garcia-Gonzalez, J. A.
    Tecnol Monterrey, Mexico.
    Garfias, F.
    Univ Nacl Autonoma Mexico, Mexico.
    Giacinti, G.
    Max Planck Inst Nucl Phys, Germany;Univ Wisconsin, USA.
    Gonzalez, M. M.
    Univ Nacl Autonoma Mexico, Mexico.
    Goodman, J. A.
    Univ Maryland, USA.
    Harding, J. P.
    Los Alamos Natl Lab, USA.
    Hernandez, S.
    Univ Nacl Autonoma Mexico, Mexico.
    Hona, B.
    Univ Utah, USA.
    Huang, D.
    Michigan Technol Univ, USA.
    Hueyotl-Zahuantitla, F.
    Univ Autonoma Chiapas, Mexico.
    Huntemeyer, P.
    Michigan Technol Univ, USA.
    Iriarte, A.
    Univ Nacl Autonoma Mexico, Mexico.
    Jardin-Blicq, A.
    Max Planck Inst Nucl Phys, Germany;Univ Wisconsin, USA;Chulalongkorn Univ, Thailand;Natl Astron Res Inst Thailand Publ Org, Thailand.
    Joshi, V
    Friedrich Alexander Univ Erlangen Nurnberg, Germany;Univ Wisconsin, USA.
    Kieda, D.
    Univ Utah, USA.
    Lee, W. H.
    Univ Nacl Autonoma Mexico, Mexico.
    Leon Vargas, H.
    Univ Nacl Autonoma Mexico, Mexico.
    Linnemann, J. T.
    Michigan State Univ, USA.
    Longinotti, A. L.
    Inst Nacl Astrofis Opt & Electr, Mexico.
    Luis-Raya, G.
    Univ Politecn Pachuca, Mexico.
    Lopez-Coto, R.
    Ist Nazl Fis Nucl, Italy;Univ Padua, Italy.
    Malone, K.
    Los Alamos Natl Lab, USA.
    Martinez, O.
    Benemerita Univ Autonoma Puebla, Mexico.
    Martinez-Castellanos, I
    Univ Maryland, USA.
    Martinez-Castro, J.
    Inst Politecn Nacl, Mexico.
    Matthews, J. A.
    Univ New Mexico, USA.
    Miranda-Romagnoli, P.
    Univ Autonoma Estado Hidalgo, Mexico.
    Morales-Soto, J. A.
    Univ Michoacana, Mexico.
    Moreno, E.
    Benemerita Univ Autonoma Puebla, Mexico.
    Mostafa, M.
    Penn State Univ, USA.
    Nellen, L.
    Univ Nacl Autonoma Mexico, Mexico.
    Newbold, M.
    Univ Utah, USA.
    Nisa, M. U.
    Michigan State Univ, USA.
    Noriega-Papaqui, R.
    Univ Autonoma Estado Hidalgo, Mexico.
    Omodei, N.
    Stanford Univ, USA.
    Peisker, A.
    Michigan State Univ, USA.
    Araujo, Y. Perez
    Univ Nacl Autonoma Mexico, Mexico.
    Perez-Perez, E. G.
    Univ Politecn Pachuca, Mexico.
    Rho, C. D.
    Univ Politecn Pachuca, Pachuca, Mexico.
    Rosa-Gonzalez, D.
    Inst Nacl Astrofis Opt & Electr, Mexico.
    Ruiz-Velasco, E.
    Max Planck Inst Nucl Phys, Germany;Univ Wisconsin, USA.
    Salesa Greus, F.
    Polish Acad Sci, Poland;Univ Valencia, Spain.
    Sandoval, A.
    Univ Nacl Autonoma Mexico, Mexico.
    Schneider, M.
    Univ Maryland, Dept Phys, USA.
    Schoorlemmer, H.
    Max Planck Inst Nucl Phys, Germany.
    Serna-Franco, J.
    Univ Nacl Autonoma Mexico, Mexico.
    Smith, A. J.
    Univ Maryland, USA.
    Springer, R. W.
    Univ Utah, USA.
    Surajbali, P.
    Max Planck Inst Nucl Phys, Germany.
    Tollefson, K.
    Michigan State Univ, USA.
    Torres, I
    Inst Nacl Astrofis Opt & Electr, Mexico.
    Torres-Escobedo, R.
    Univ Guadalajara, Mexico.
    Turner, R.
    Michigan Technol Univ, USA.
    Urena-Mena, F.
    Inst Nacl Astrofis Opt & Electr, Mexico.
    Villasenor, L.
    Benemerita Univ Autonoma Puebla, Mexico.
    Weisgarber, T.
    Univ Wisconsin, USA.
    Willox, E.
    Univ Maryland, USA.
    Zhou, H.
    Michigan Technol Univ, USA.
    TeV Emission of Galactic Plane Sources with HAWC and HESS2021In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 917, no 1, article id 6Article in journal (Refereed)
    Abstract [en]

    The High Altitude Water Cherenkov (HAWC) observatory and the High Energy Stereoscopic System (H.E.S.S.) are two leading instruments in the ground-based very-high-energy gamma-ray domain. HAWC employs the water Cherenkov detection (WCD) technique, while H.E.S.S. is an array of Imaging Atmospheric Cherenkov Telescopes (IACTs). The two facilities therefore differ in multiple aspects, including their observation strategy, the size of their field of view, and their angular resolution, leading to different analysis approaches. Until now, it has been unclear if the results of observations by both types of instruments are consistent: several of the recently discovered HAWC sources have been followed up by IACTs, resulting in a confirmed detection only in a minority of cases. With this paper, we go further and try to resolve the tensions between previous results by performing a new analysis of the H.E.S.S. Galactic plane survey data, applying an analysis technique comparable between H.E.S.S. and HAWC. Events above 1 TeV are selected for both data sets, the point-spread function of H.E.S.S. is broadened to approach that of HAWC, and a similar background estimation method is used. This is the first detailed comparison of the Galactic plane observed by both instruments. H.E.S.S. can confirm the gamma-ray emission of four HAWC sources among seven previously undetected by IACTs, while the three others have measured fluxes below the sensitivity of the H.E.S.S. data set. Remaining differences in the overall gamma-ray flux can be explained by the systematic uncertainties. Therefore, we confirm a consistent view of the gamma-ray sky between WCD and IACT techniques.

  • 7.
    Abdalla, H.
    et al.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek 10005, Namibia..
    Aharonian, F.
    Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland.;Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany.;RAU, High Energy Astrophys Lab, 123 Hovsep Emin St, Yerevan 0051, Armenia..
    Benkhali, F. Ait
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Anguner, E. O.
    Aix Marseille Univ, CPPM, CNRS IN2P3, Marseille, France..
    Ashkar, H.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Backes, M.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek 10005, Namibia.;North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Baghmanyan, V
    Inst Fizyki Jadrowej PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland..
    Martins, V. Barbosa
    DESY, D-15738 Zeuthen, Germany..
    Batzofin, R.
    Univ Witwatersrand, Sch Phys, 1 Jan Smuts Ave, ZA-2050 Johannesburg, South Africa..
    Becherini, Yvonne
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Berge, D.
    DESY, D-15738 Zeuthen, Germany..
    Bernlohr, K.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Bi, B.
    Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
    Bottcher, M.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Boisson, C.
    Univ Paris, Univ PSL, Observ Paris, Lab Univers & Theories,CNRS, F-92190 Meudon, France..
    Bolmont, J.
    Sorbonne Univ, Univ Paris Diderot, Sorbonne Paris Cite, CNRS IN2P3,Lab Phys Nucl & Hautes Energies,LPNHE, 4 Pl Jussieu, F-75252 Paris, France..
    de Lavergne, M. de Bony
    Univ Savoie Mt Blanc, Lab Annecy Phys Particules, CNRS, IN2P3, F-74000 Annecy, France..
    Brose, R.
    Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland..
    Brun, F.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Bulik, T.
    Univ Warsaw, Astron Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland..
    Bylund, Tomas
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Cangemi, F.
    Sorbonne Univ, Univ Paris Diderot, Sorbonne Paris Cite, CNRS IN2P3,Lab Phys Nucl & Hautes Energies,LPNHE, 4 Pl Jussieu, F-75252 Paris, France..
    Caroff, S.
    Sorbonne Univ, Univ Paris Diderot, Sorbonne Paris Cite, CNRS IN2P3,Lab Phys Nucl & Hautes Energies,LPNHE, 4 Pl Jussieu, F-75252 Paris, France..
    Casanova, S.
    Inst Fizyki Jadrowej PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland..
    Chand, T.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Chen, A.
    Univ Witwatersrand, Sch Phys, 1 Jan Smuts Ave, ZA-2050 Johannesburg, South Africa..
    Cotter, G.
    Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
    Mbarubucyeye, J. Damascene
    DESY, D-15738 Zeuthen, Germany..
    Devin, J.
    Univ Bordeaux, Ctr Etud Nucl Bordeaux Gradignan, CNRS IN2P3, F-33175 Gradignan, France..
    Djannati-Atai, A.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Egberts, K.
    Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany..
    Ernenwein, J-P
    Aix Marseille Univ, CPPM, CNRS IN2P3, Marseille, France..
    Fegan, S.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, Inst Polytech Paris, F-91128 Palaiseau, France..
    Fiasson, A.
    Univ Savoie Mt Blanc, Lab Annecy Phys Particules, CNRS, IN2P3, F-74000 Annecy, France..
    de Clairfontaine, G. Fichet
    Univ Paris, Univ PSL, Observ Paris, Lab Univers & Theories,CNRS, F-92190 Meudon, France..
    Fontaine, G.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, Inst Polytech Paris, F-91128 Palaiseau, France..
    Funk, S.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Gabici, S.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Giavitto, G.
    DESY, D-15738 Zeuthen, Germany..
    Giunti, L.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.;Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Glawion, D.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Glicenstein, J. F.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Grondin, M-H
    Univ Bordeaux, Ctr Etud Nucl Bordeaux Gradignan, CNRS IN2P3, F-33175 Gradignan, France..
    Hinton, J. A.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Horbe, M.
    Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
    Hofmann, W.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Holch, T. L.
    DESY, D-15738 Zeuthen, Germany..
    Holler, M.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Huang, Zhiqiu
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Huber, D.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Jamrozy, M.
    Uniwersytet Jagiellonski, Obserwatorium Astron, Ul Orla 171, PL-30244 Krakow, Poland..
    Jankowsky, F.
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Jung-Richardt, I
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Kasai, E.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek 10005, Namibia..
    Katarzynski, K.
    Nicolaus Copernicus Univ, Fac Phys Astron & Informat, Inst Astron, Grudziadzka 5, PL-87100 Torun, Poland..
    Katz, U.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Khelifi, B.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Komin, Nu
    Univ Witwatersrand, Sch Phys, 1 Jan Smuts Ave, ZA-2050 Johannesburg, South Africa..
    Konno, R.
    DESY, D-15738 Zeuthen, Germany..
    Kosack, K.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Kostunin, D.
    DESY, D-15738 Zeuthen, Germany..
    Kundu, A.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Lamanna, G.
    Univ Savoie Mt Blanc, Lab Annecy Phys Particules, CNRS, IN2P3, F-74000 Annecy, France..
    Le Stum, S.
    Aix Marseille Univ, CPPM, CNRS IN2P3, Marseille, France..
    Lemiere, A.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Lemoine-Goumard, M.
    Univ Bordeaux, Ctr Etud Nucl Bordeaux Gradignan, CNRS IN2P3, F-33175 Gradignan, France..
    Lenain, J-P
    Sorbonne Univ, Univ Paris Diderot, Sorbonne Paris Cite, CNRS IN2P3,Lab Phys Nucl & Hautes Energies,LPNHE, 4 Pl Jussieu, F-75252 Paris, France..
    Leuschner, F.
    Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
    Lohse, T.
    Humboldt Univ, Inst Phys, Newtonstr 15, D-12489 Berlin, Germany..
    Luashvili, A.
    Univ Paris, Univ PSL, Observ Paris, Lab Univers & Theories,CNRS, F-92190 Meudon, France..
    Lypova, I
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Mackey, J.
    Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland..
    Majumdar, J.
    DESY, D-15738 Zeuthen, Germany..
    Malyshev, D.
    Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
    Marandon, V
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Marchegiani, P.
    Univ Witwatersrand, Sch Phys, 1 Jan Smuts Ave, ZA-2050 Johannesburg, South Africa..
    Marti-Devesa, G.
    Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria..
    Marx, R.
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Maurin, G.
    Univ Savoie Mt Blanc, Lab Annecy Phys Particules, CNRS, IN2P3, F-74000 Annecy, France..
    Meintjes, P. J.
    Univ Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa..
    Mitchell, A.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Mohrmann, L.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Montanari, A.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Moulin, E.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Muller, J.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, Inst Polytech Paris, F-91128 Palaiseau, France..
    Murach, T.
    DESY, D-15738 Zeuthen, Germany..
    de Naurois, M.
    Ecole Polytech, Lab Leprince Ringuet, CNRS, Inst Polytech Paris, F-91128 Palaiseau, France..
    Nayerhoda, A.
    Inst Fizyki Jadrowej PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland..
    Niemiec, J.
    Inst Fizyki Jadrowej PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland..
    Noel, A. Priyana
    Uniwersytet Jagiellonski, Obserwatorium Astron, Ul Orla 171, PL-30244 Krakow, Poland..
    O'Brien, P.
    Univ Leicester, Dept Phys & Astron, Univ Rd, Leicester LE1 7RH, Leics, England..
    Ohm, S.
    DESY, D-15738 Zeuthen, Germany..
    Olivera-Nieto, L.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Wilhelmi, E. de Ona
    DESY, D-15738 Zeuthen, Germany..
    Ostrowski, M.
    Uniwersytet Jagiellonski, Obserwatorium Astron, Ul Orla 171, PL-30244 Krakow, Poland..
    Panter, M.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Parsons, R. D.
    Humboldt Univ, Inst Phys, Newtonstr 15, D-12489 Berlin, Germany..
    Peron, G.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Poireau, V
    Univ Savoie Mt Blanc, Lab Annecy Phys Particules, CNRS, IN2P3, F-74000 Annecy, France..
    Prokhorov, D. A.
    Univ Amsterdam, Anton Pannekoek Inst Astron, GRAPPA, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands..
    Prokoph, H.
    DESY, D-15738 Zeuthen, Germany..
    Puhlhofer, G.
    Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
    Punch, Michael
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering. Univ Paris, France.
    Quirrenbach, A.
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Reichherzer, P.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Renaud, M.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS IN2P3, CC 72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    Rieger, F.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Rowell, G.
    Univ Adelaide, Sch Phys Sci, Adelaide, SA 5005, Australia..
    Rudak, B.
    Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland..
    Ricarte, H. Rueda
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Ruiz-Velasco, E.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Sahakian, V
    Yerevan Phys Inst, 2 Alikhanian Bros St, Yerevan 375036, Armenia..
    Sailer, S.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Salzmann, H.
    Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
    Sanchez, D. A.
    Univ Savoie Mt Blanc, Lab Annecy Phys Particules, CNRS, IN2P3, F-74000 Annecy, France..
    Santangelo, A.
    Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
    Sasaki, M.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Schussler, F.
    Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
    Schutte, H. M.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
    Schwanke, U.
    Humboldt Univ, Inst Phys, Newtonstr 15, D-12489 Berlin, Germany..
    Senniappan, Mohanraj
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Shapopi, J. N. S.
    Univ Namibia, Dept Phys, Private Bag 13301, Windhoek 10005, Namibia..
    Sinha, A.
    Univ Montpellier, Lab Univers & Particules Montpellier, CNRS IN2P3, CC 72,Pl Eugene Bataillon, F-34095 Montpellier 5, France..
    Sol, H.
    Univ Paris, Univ PSL, Observ Paris, Lab Univers & Theories,CNRS, F-92190 Meudon, France..
    Specovius, A.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Spencer, S.
    Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
    Stawarz, L.
    Uniwersytet Jagiellonski, Obserwatorium Astron, Ul Orla 171, PL-30244 Krakow, Poland..
    Steinmassl, S.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Steppa, C.
    Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany..
    Sun, L.
    Univ Amsterdam, Anton Pannekoek Inst Astron, GRAPPA, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands..
    Takahashi, T.
    Univ Tokyo, Univ Tokyo Inst Adv Study UTIAS, Kavli Inst Phys & Math Universe WPI, 5-1-5 Kashiwa No Ha, Kashiwa, Chiba 2778583, Japan..
    Tanaka, T.
    Konan Univ, Dept Phys, Higashinada Ku, 8-9-1 Okamoto, Kobe, Hyogo 6588501, Japan..
    Terrier, R.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    Thorpe-Morgan, C.
    Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany..
    Tsirou, M.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Tsuji, N.
    RIKEN, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Uchiyama, Y.
    Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan..
    van Eldik, C.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Veh, J.
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Vink, J.
    Univ Amsterdam, Anton Pannekoek Inst Astron, GRAPPA, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands..
    Wagner, S. J.
    Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany..
    Werner, F.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    White, R.
    Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
    Wierzcholska, A.
    Inst Fizyki Jadrowej PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland..
    Wong, Yu Wun
    Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany..
    Zacharias, M.
    North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa.;Univ Paris, Univ PSL, Observ Paris, Lab Univers & Theories,CNRS, F-92190 Meudon, France..
    Zargaryan, D.
    Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland.;RAU, High Energy Astrophys Lab, 123 Hovsep Emin St, Yerevan 0051, Armenia..
    Zdziarski, A. A.
    Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland..
    Zech, A.
    Univ Paris, Univ PSL, Observ Paris, Lab Univers & Theories,CNRS, F-92190 Meudon, France..
    Zhu, S. J.
    DESY, D-15738 Zeuthen, Germany..
    Zouari, S.
    Univ Paris, Astroparticule & Cosmol, CNRS, F-75013 Paris, France..
    H.E.S.S. Follow-up Observations of Binary Black Hole Coalescence Events during the Second and Third Gravitational-wave Observing Runs of Advanced LIGO and Advanced Virgo2021In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 923, no 1, article id 109Article in journal (Refereed)
    Abstract [en]

    We report on the observations of four well-localized binary black hole (BBH) mergers by the High Energy Stereoscopic System (H.E.S.S.) during the second and third observing runs of Advanced LIGO and Advanced Virgo, O2 and O3. H.E.S.S. can observe 20 deg(2) of the sky at a time and follows up gravitational-wave (GW) events by "tiling" localization regions to maximize the covered localization probability. During O2 and O3, H.E.S.S. observed large portions of the localization regions, between 35% and 75%, for four BBH mergers (GW170814, GW190512_180714, GW190728_064510, and S200224ca). For these four GW events, we find no significant signal from a pointlike source in any of the observations, and we set upper limits on the very high energy (>100 GeV) gamma-ray emission. The 1-10 TeV isotropic luminosity of these GW events is below 10(45) erg s(-1) at the times of the H.E.S.S. observations, around the level of the low-luminosity GRB 190829A. Assuming no changes are made to how follow-up observations are conducted, H.E.S.S. can expect to observe over 60 GW events per year in the fourth GW observing run, O4, of which eight would be observable with minimal latency.

  • 8. Abdo, A. A.
    et al.
    Ackermann, M.
    Ajello, M.
    Asano, K.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bastieri, D.
    Baughman, B. M.
    Bechtol, K.
    Bellazzini, R.
    Blandford, R. D.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, A.
    Casandjian, J. M.
    Cavazzuti, E.
    Cecchi, C.
    Celotti, A.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Colafrancesco, S.
    Cominsky, L. R.
    Conrad, J.
    Costamante, L.
    Dermer, C. D.
    de Angelis, A.
    de Palma, F.
    Digel, S. W.
    Donato, D.
    Silva, E. D. E.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Farnier, C.
    Favuzzi, C.
    Finke, J.
    Focke, W. B.
    Frailis, M.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Georganopoulos, M.
    Germani, S.
    Giebels, B.
    Giglietto, N.
    Giordano, F.
    Glanzman, T.
    Grenier, I. A.
    Grondin, M. H.
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Hanabata, Y.
    Harding, A. K.
    Hartman, R. C.
    Hayashida, M.
    Hays, E.
    Hughes, R. E.
    Johannesson, G.
    Johnson, A. S.
    Johnson, R. P.
    Johnson, W. N.
    Kadler, M.
    Kamae, T.
    Kanai, Y.
    Katagiri, H.
    Kataoka, J.
    Kawai, N.
    Kerr, M.
    Knodlseder, J.
    Kuehn, F.
    Kuss, M.
    Latronico, L.
    Lemoine-Goumard, M.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Madejski, G. M.
    Makeev, A.
    Mazziotta, M. N.
    McEnery, J. E.
    Meurer, C.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Moiseev, A.
    Monte, C.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nakamori, T.
    Nolan, L.
    Norris, J. P.
    Nuss, E.
    Ohsugi, T.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Porter, T. A.
    Raino, S.
    Razzano, M.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Ritz, S.
    Rodriguez, A. Y.
    Romani, R. W.
    Ryde, F.
    Sadrozinski, H. F. W.
    Sambruna, R.
    Sanchez, D.
    Sander, A.
    Sato, R.
    Parkinson, P. M. S.
    Sgro, C.
    Smith, D. A.
    Smith, P. D.
    Spandre, G.
    Spinelli, P.
    Starck, J. L.
    Strickman, M. S.
    Strong, A. W.
    Suson, D. J.
    Tajima, H.
    Takahashi, H.
    Takahashi, T.
    Tanaka, T.
    Taylor, G. B.
    Thayer, J. G.
    Thompson, D. J.
    Torres, D. F.
    Tosti, G.
    Uchiyama, Y.
    Usher, T. L.
    Vilchez, N.
    Vitale, V.
    Waite, A. P.
    Wood, K. S.
    Ylinen, T.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Ziegler, M.
    Aller, H. D.
    Aller, M. F.
    Kellermann, K. I.
    Kovalev, Y. Y.
    Kovalev, Y. A.
    Lister, M. L.
    Pushkarev, A. B.
    FERMI DISCOVERY OF GAMMA-RAY EMISSION FROM NGC 12752009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 699, no 1, p. 31-39Article in journal (Refereed)
    Abstract [en]

    We report the discovery of high-energy (E > 100 MeV) gamma-ray emission from NGC 1275, a giant elliptical galaxy lying at the center of the Perseus cluster of galaxies, based on observations made with the Large Area Telescope (LAT) of the Fermi Gamma-ray Space Telescope. The positional center of the gamma-ray source is only approximate to 3' away from the NGC 1275 nucleus, well within the 95% LAT error circle of approximate to 5'. The spatial distribution of gamma-ay photons is consistent with a point source. The average flux and power-law photon index measured with the LAT from 2008 August 4 to 2008 December 5 are F-gamma = (2.10 +/- 0.23) x 10(-7) ph (>100 MeV) cm(-2) s(-1) and Gamma = 2.17 +/- 0.05, respectively. The measurements are statistically consistent with constant flux during the four-month LAT observing period. Previous EGRET observations gave an upper limit of F-gamma < 3.72 x 10(-8) ph (>100 MeV) cm(-2) s(-1) to the gamma-ray flux from NGC 1275. This indicates that the source is variable on timescales of years to decades, and therefore restricts the fraction of emission that can be produced in extended regions of the galaxy cluster. Contemporaneous and historical radio observations are also reported. The broadband spectrum of NGC 1275 is modeled with a simple one-zone synchrotron/synchrotron self-Compton model and a model with a decelerating jet flow.

  • 9. Abdo, A. A.
    et al.
    Ackermann, M.
    Ajello, M.
    Atwoo, W. B.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bastieri, D.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Blandford, R. D.
    Bonamente, E.
    Borgland, A. W.
    Bottacini, E.
    Bouvier, A.
    Bregeon, J.
    Brigida, M.
    Bruel, P.
    Buehler, R.
    Buson, S.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Casandjian, J. M.
    Cecchi, C.
    Charles, E.
    Chekhtman, A.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Conrad, J.
    Cutini, S.
    D’Ammando, F.
    de Angelis, A.
    de Palma, F.
    Dermer, C. D.
    Digel, S. W.
    Silva, E. d. C. e.
    Drell, P. S.
    Drlica-Wagner, A.
    Dubois, R.
    Favuzzi, C.
    Fegan, S. J.
    Focke, W. B.
    Fortin, P.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gehrels, N.
    Germani, S.
    Giglietto, N.
    Giommi, P.
    Giordano, F.
    Giroletti, M.
    Glanzman, T.
    Godfrey, G.
    Gomez-Vargas, G. A.
    Grenier, I. A.
    Grove, J. E.
    Guiriec, S.
    Hadasch, D.
    Hays, E.
    Hill, A. B.
    Horan, D.
    Hou, X.
    Hughes, R. E.
    Iafrate, G.
    Jackson, M. S.
    Jóhannesson, G.
    Johnson, A. S.
    Kamae, T.
    Katagiri, H.
    Kataoka, J.
    Knödlseder, J.
    Kuss, M.
    Lande, J.
    Larsson, S.
    Latronico, L.
    Lemoine-Goumard, M.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Mazziotta, M. N.
    McEnery, J. E.
    Mehault, J.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Moiseev, A. A.
    Monte, C.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Naumann-Godo, M.
    Nolan, P. L.
    Norris, J. P.
    Nuss, E.
    Ohno, M.
    Ohsugi, T.
    Okumura, A.
    Omodei, N.
    Orienti, M.
    Orlando, E.
    Ormes, J. F.
    Ozaki, M.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pesce-Rollins, M.
    Pierbattista, M.
    Piron, F.
    Pivato, G.
    Poon, H.
    Porter, T. A.
    Prokhorov, Dmitry
    Stanford Univ, USA.
    Rainò, S.
    Rando, R.
    Razzano, M.
    Razzaque, S.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Rochester, L. S.
    Roth, M.
    Sadrozinski, H. F. -W
    Sanchez, D. A.
    Sbarra, C.
    Schalk, T. L.
    Sgrò, C.
    Share, G. H.
    Siskind, E. J.
    Spandre, G.
    Spinelli, P.
    Stawarz, \L.
    Takahashi, H.
    Tanaka, T.
    Thayer, J. G.
    Thayer, J. B.
    Thompson, D. J.
    Tibaldo, L.
    Tinivella, M.
    Torres, D. F.
    Tosti, G.
    Troja, E.
    Uchiyama, Y.
    Usher, T. L.
    Vandenbroucke, J.
    Vasileiou, V.
    Vianello, G.
    Vitale, V.
    Waite, A. P.
    Wang, P.
    Winer, B. L.
    Wood, D. L.
    Wood, K. S.
    Yang, Z.
    Zimmer, S.
    Fermi Observations of γ-Ray Emission from the Moon2012In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 758, no 2, article id 140Article in journal (Refereed)
    Abstract [en]

    We report on the detection of high-energy gamma-ray emission from the Moon during the first 24 months of observations by the Fermi Large Area Telescope (LAT). This emission comes from particle cascades produced by cosmic-ray (CR) nuclei and electrons interacting with the lunar surface. The differential spectrum of the Moon is soft and can be described as a log-parabolic function with an effective cutoff at 2-3 GeV, while the average integral flux measured with the LAT from the beginning of observations in 2008 August to the end of 2010 August is F(> 100 MeV) = (1.04 +/- 0.01 [statistical error] +/- 0.1 [systematic error]) x 10(-6) cm(-2) s(-1). This flux is about a factor 2-3 higher than that observed between 1991 and 1994 by the EGRET experiment on boardthe Compton Gamma Ray Observatory, F(> 100 MeV) approximate to 5 x 10(-7) cm-2 s-1, when solar activity was relatively high. The higher gamma-ray flux measured by Fermi is consistent with the deep solar minimum conditions during the first 24 months of the mission, which reduced effects of heliospheric modulation, and thus increased the heliospheric flux of Galactic CRs. A detailed comparison of the light curve with McMurdo Neutron Monitor rates suggests a correlation of the trends. The Moon and the Sun are so far the only known bright emitters of gamma-rays with fast celestial motion. Their paths across thesky are projected onto the Galactic center and high Galactic latitudes as well as onto other areas crowded with high-energy gamma-ray sources. Analysis ofthe lunar and solar emission may thus be important for studies of weak and transient sources near the ecliptic.

  • 10. Abdo, A. A.
    et al.
    Ackermann, M.
    Ajello, M.
    Atwood, W. B.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Baring, M. G.
    Bastieri, D.
    Baughman, B. M.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Caliandro, G. A.
    Cameron, R. A.
    Camilo, F.
    Caraveo, P. A.
    Casandjian, J. M.
    Cecchi, C.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cognard, I.
    Cohen-Tanugi, J.
    Conrad, J.
    de Angelis, A.
    de Palma, F.
    Dormody, M.
    Silva, E. D. E.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Farnier, C.
    Favuzzi, C.
    Frailis, M.
    Freire, P. C. C.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gehrels, N.
    Germani, S.
    Giebels, B.
    Giglietto, N.
    Giordano, F.
    Glanzman, T.
    Godfrey, G.
    Grenier, I. A.
    Grondin, M. H.
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Halpern, J.
    Hanabata, Y.
    Harding, A. K.
    Hayashida, M.
    Hays, E.
    Hobbs, G.
    Hughes, R. E.
    Johannesson, G.
    Johnson, A. S.
    Johnson, R. P.
    Johnson, T. J.
    Johnson, W. N.
    Johnston, S.
    Kamae, T.
    Katagiri, H.
    Kataoka, J.
    Kawai, N.
    Kerr, M.
    Knodlseder, J.
    Kocian, M. L.
    Kramer, M.
    Kuehn, F.
    Kuss, M.
    Lande, J.
    Latronico, L.
    Lemoine-Goumard, M.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Lyne, A. G.
    Makeev, A.
    Manchester, R. N.
    Marelli, M.
    Mazziotta, M. N.
    McEnery, J. E.
    Meurer, C.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Moiseev, A. A.
    Monte, C.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nolan, P. L.
    Norris, J. P.
    Noutsos, A.
    Nuss, E.
    Ohsugi, T.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Ozaki, M.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Ransom, S. M.
    Razzano, M.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Rochester, L. S.
    Rodriguez, A. Y.
    Romani, R. W.
    Roth, M.
    Ryde, F.
    Sadrozinski, H. F. W.
    Sanchez, D.
    Sander, A.
    Parkinson, P. M. S.
    Scargle, J. D.
    Sgro, C.
    Siskind, E. J.
    Smith, D. A.
    Smith, P. D.
    Spandre, G.
    Spinelli, P.
    Stappers, B. W.
    Strickman, M. S.
    Suson, D. J.
    Tajima, H.
    Takahashi, H.
    Tanaka, T.
    Thayer, J. B.
    Thayer, J. G.
    Theureau, G.
    Thompson, D. J.
    Thorsett, S. E.
    Tibaldo, L.
    Torres, D. F.
    Tosti, G.
    Uchiyama, Y.
    Usher, T. L.
    Van Etten, A.
    Vilchez, N.
    Vitale, V.
    Waite, A. P.
    Wang, P.
    Wang, N.
    Watters, K.
    Weltevrede, P.
    Winer, B. L.
    Wood, K. S.
    Ylinen, T.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Ziegler, M.
    FERMI LARGE AREA TELESCOPE DETECTION OF PULSED gamma-RAYS FROM THE VELA-LIKE PULSARS PSR J1048-5832 AND PSR J2229+61142009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 706, no 2, p. 1331-1340Article in journal (Refereed)
    Abstract [en]

    We report the detection of gamma-ray pulsations (>= 0.1GeV) from PSR J2229+ 6114 and PSR J1048-5832, the latter having been detected as a low-significance pulsar by EGRET. Data in the gamma-ray band were acquired by the Large Area Telescope (LAT) aboard the Fermi Gamma-ray Space Telescope, while the radio rotational ephemerides used to fold the gamma-ray light curves were obtained using the Green Bank Telescope, the Lovell telescope at Jodrell Bank, and the Parkes Telescope. The two young radio pulsars, located within the error circles of the previously unidentified EGRET sources 3EG J1048-5840 and 3EG J2227+6122, present spin-down characteristics similar to the Vela pulsar. PSR J1048-5832 shows two sharp peaks at phases 0.15 +/- 0.01 and 0.57 +/- 0.01 relative to the radio pulse confirming the EGRET light curve, while PSR J2229+ 6114 presents a very broad peak at phase 0.49 +/- 0.01. The gamma-ray spectra above 0.1 GeV of both pulsars are fit with power laws having exponential cutoffs near 3 GeV, leading to integral photon fluxes of (2.19 +/- 0.22 +/- 0.32) x 10(-7) cm(-2) s(-1) for PSR J1048-5832 and (3.77 +/- 0.22 +/- 0.44) x 10(-7) cm(-2) s(-1) for PSR J2229+6114. The first uncertainty is statistical and the second is systematic. PSR J1048-5832 is one of the two LAT sources whichwere entangled together as 3EG J1048-5840. These detections add to the growing number of young gamma-ray pulsars that make up the dominant population of GeV gamma-ray sources in the Galactic plane.

  • 11. Abdo, A. A.
    et al.
    Ackermann, M.
    Ajello, M.
    Atwood, W. B.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Baring, M. G.
    Bastieri, D.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Casandjian, J. M.
    Cavazzuti, E.
    Cecchi, C.
    Celik, O.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Cominsky, L. R.
    Conrad, J.
    Cutini, S.
    de Angelis, A.
    de Palma, F.
    di Bernardo, G.
    Silva, E. D. E.
    Drell, P. S.
    Drlica-Wagner, A.
    Dubois, R.
    Dumora, D.
    Farnier, C.
    Favuzzi, C.
    Fegan, S. J.
    Finke, J.
    Focke, W. B.
    Fortin, P.
    Foschini, L.
    Frailis, M.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gasparrini, D.
    Gehrels, N.
    Germani, S.
    Giavitto, G.
    Giebels, B.
    Giglietto, N.
    Giommi, P.
    Giordano, F.
    Glanzman, T.
    Godfrey, G.
    Grenier, I. A.
    Grondin, M. H.
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Hanabata, Y.
    Hayashida, M.
    Hays, E.
    Horan, D.
    Hughes, R. E.
    Jackson, M. S.
    Johannesson, G.
    Johnson, A. S.
    Johnson, R. P.
    Johnson, W. N.
    Kamae, T.
    Katagiri, H.
    Kataoka, J.
    Kawai, N.
    Kerr, M.
    Knodlseder, J.
    Kocian, M. L.
    Kuss, M.
    Lande, J.
    Latronico, L.
    Lemoine-Goumard, M.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Madejski, G. M.
    Makeev, A.
    Mazziotta, M. N.
    McConville, W.
    McEnery, J. E.
    Meurer, C.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Moiseev, A. A.
    Monte, C.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nolan, P. L.
    Norris, J. P.
    Nuss, E.
    Ohsugi, T.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Ozaki, M.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pelassa, V.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Razzano, M.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Reyes, L. C.
    Ritz, S.
    Rochester, L. S.
    Rodriguez, A. Y.
    Roth, M.
    Ryde, F.
    Sadrozinski, H. F. W.
    Sanchez, D.
    Sander, A.
    Parkinson, P. M. S.
    Scargle, J. D.
    Schalk, T. L.
    Sellerholm, A.
    Sgro, C.
    Shaw, M. S.
    Siskind, E. J.
    Smith, D. A.
    Smith, P. D.
    Spandre, G.
    Spinelli, P.
    Strickman, M. S.
    Suson, D. J.
    Tajima, H.
    Takahashi, H.
    Takahashi, T.
    Tanaka, T.
    Tanaka, Y.
    Thayer, J. B.
    Thayer, J. G.
    Thompson, D. J.
    Tibaldo, L.
    Torres, D. F.
    Tosti, G.
    Tramacere, A.
    Uchiyama, Y.
    Usher, T. L.
    Vasileiou, V.
    Vilchez, N.
    Vitale, V.
    Waite, A. P.
    Wang, P.
    Winer, B. L.
    Wood, K. S.
    Ylinen, T.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Ziegler, M.
    FERMI OBSERVATIONS OF TeV-SELECTED ACTIVE GALACTIC NUCLEI2009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 707, no 2, p. 1310-1333Article in journal (Refereed)
    Abstract [en]

    We report on observations of TeV-selected active galactic nuclei (AGNs) made during the first 5.5 months of observations with the Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope (Fermi). In total, 96 AGNs were selected for study, each being either (1) a source detected at TeV energies (28 sources) or (2) an object that has been studied with TeV instruments and for which an upper limit has been reported (68 objects). The Fermi observations show clear detections of 38 of these TeV-selected objects, of which 21 are joint GeV-TeV sources, and 29 were not in the third EGRET catalog. For each of the 38 Fermi-detected sources, spectra and light curves are presented. Most can be described with a power law of spectral index harder than 2.0, with a spectral break generally required to accommodate the TeV measurements. Based on an extrapolation of the Fermi spectrum, we identify sources, not previously detected at TeV energies, which are promising targets for TeV instruments. Evidence for systematic evolution of the gamma-ray spectrum with redshift is presented and discussed in the context of interaction with the extragalactic background light.

  • 12. Abdo, A. A.
    et al.
    Ackermann, M.
    Ajello, M.
    Atwood, W. B.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bastieri, D.
    Battelino, M.
    Baughman, B. M.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Blandford, R. D.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bouvier, A.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Casandjian, J. M.
    Cavazzuti, E.
    Cecchi, C.
    Charles, E.
    Chaty, S.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Cominsky, L. R.
    Conrad, J.
    Costamante, L.
    Cutini, S.
    Dermer, C. D.
    de Angelis, A.
    de Palma, F.
    Digel, S. W.
    Silva, E. D. E.
    Donato, D.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Farnier, C.
    Favuzzi, C.
    Focke, W. B.
    Foschini, L.
    Frailis, M.
    Fuhrmann, L.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gasparrini, D.
    Gehrels, N.
    Germani, S.
    Giebels, B.
    Giglietto, N.
    Giommi, P.
    Giordano, F.
    Glanzman, T.
    Godfrey, G.
    Grenier, I. A.
    Grondin, M. H.
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Hanabata, Y.
    Harding, A. K.
    Hartman, R. C.
    Hayashida, M.
    Hays, E.
    Hughes, R. E.
    Johannesson, G.
    Johnson, A. S.
    Johnson, R. P.
    Johnson, W. N.
    Kamae, T.
    Katagiri, H.
    Kataoka, J.
    Kawai, N.
    Kerr, M.
    Knodlseder, J.
    Kocian, M. L.
    Kuehn, F.
    Kuss, M.
    Latronico, L.
    Lee, S. H.
    Lemoine-Goumard, M.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Madejski, G. M.
    Makeev, A.
    Massaro, E.
    Mazziotta, M. N.
    McEnery, J. E.
    McGlynn, S.
    Meurer, C.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Moiseev, A. A.
    Monte, C.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nolan, P. L.
    Norris, J. P.
    Nuss, E.
    Ohsugi, T.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pelassa, V.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Razzano, M.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Reyes, L. C.
    Ritz, S.
    Rochester, L. S.
    Rodriguez, A. Y.
    Rahoui, F.
    Ryde, F.
    Sadrozinski, H. F. W.
    Sambruna, R.
    Sanchez, D.
    Sander, A.
    Parkinson, P. M. S.
    Sgro, C.
    Shaw, M. S.
    Smith, D. A.
    Smith, P. D.
    Spandre, G.
    Spinelli, P.
    Starck, J. L.
    Strickman, M. S.
    Suson, D. J.
    Tajima, H.
    Takahashi, H.
    Takahashi, T.
    Tanaka, T.
    Thayer, J. B.
    Thayer, J. G.
    Thompson, D. J.
    Tibaldo, L.
    Torres, D. F.
    Tosti, G.
    Tramacere, A.
    Uchiyama, Y.
    Usher, T. L.
    Vilchez, N.
    Villata, M.
    Vitale, V.
    Waite, A. P.
    Winer, B. L.
    Wood, K. S.
    Ylinen, T.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Zensus, J. A.
    Ziegler, M.
    EARLY FERMI GAMMA-RAY SPACE TELESCOPE OBSERVATIONS OF THE QUASAR 3C 454.32009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 699, no 1, p. 817-823Article in journal (Refereed)
    Abstract [en]

    This is the first report of Fermi Gamma-Ray Space Telescope observations of the quasar 3C 454.3, which has been undergoing pronounced long-term outbursts since 2000. The data from the Large Area Telescope, covering 2008 July 7-October 6, indicate strong, highly variable.-ray emission with an average flux of similar to 3 x 10 (6) photons cm(-2) s(-1), for energies > 100 MeV. The gamma-ray flux is variable, with strong, distinct, symmetrically shaped flares for which the flux increases by a factor of several on a timescale of about 3 days. This variability indicates a compact emission region, and the requirement that the source is optically thin to pair production implies relativistic beaming with Doppler factor delta > 8, consistent with the values inferred from Very Long Baseline Interferometry observations of superluminal expansion (delta similar to 25). The observed gamma-ray spectrum is not consistent with a simple power law, but instead steepens strongly above similar to 2 GeV, and is well described by a broken power law with photon indices of similar to 2.3 and similar to 3.5 below and above the break, respectively. This is the first direct observation of a break in the spectrum of a high-luminosity blazar above 100 MeV, and it is likely direct evidence for an intrinsic break in the energy distribution of the radiating particles. Alternatively, the spectral softening above 2 GeV could be due to gamma-ray absorption via photon-photon pair production on the soft X-ray photon field of the host active galactic nucleus, but such an interpretation would require the dissipation region to be located very close (less than or similar to 100 gravitational radii) to the black hole, which would be inconsistent with the X-ray spectrum of the source.

  • 13. Abdo, A. A.
    et al.
    Ackermann, M.
    Ajello, M.
    Atwood, W. B.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bastieri, D.
    Baughman, B. M.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Carlson, P.
    Casandjian, J. M.
    Cecchi, C.
    Celik, O.
    Chekhtman, A.
    Cheung, C. C.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Conrad, J.
    Cutini, S.
    Dermer, C. D.
    de Angelis, A.
    de Palma, F.
    Digel, S. W.
    Silva, E. D. E.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Farnier, C.
    Favuzzi, C.
    Fegan, S. J.
    Focke, W. B.
    Frailis, M.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gasparrini, D.
    Gehrels, N.
    Germani, S.
    Giebels, B.
    Giglietto, N.
    Giordano, F.
    Glanzman, T.
    Godfrey, G.
    Grenier, I. A.
    Grondin, M. H.
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Hanabata, Y.
    Harding, A. K.
    Hayashida, M.
    Hays, E.
    Hughes, R. E.
    Johannesson, G.
    Johnson, A. S.
    Johnson, R. P.
    Johnson, W. N.
    Kamae, T.
    Katagiri, H.
    Kawai, N.
    Kerr, M.
    Knodlseder, J.
    Kocian, M. L.
    Kuehn, F.
    Kuss, M.
    Lande, J.
    Latronico, L.
    Lemoine-Goumard, M.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Makeev, A.
    Mazziotta, M. N.
    McEnery, J. E.
    Meurer, C.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Moiseev, A. A.
    Monte, C.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nolan, P. L.
    Norris, J. P.
    Nuss, E.
    Ohsugi, T.
    Okumura, A.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Ozaki, M.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Pohl, M.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Razzano, M.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Ritz, S.
    Rochester, L. S.
    Rodriguez, A. Y.
    Ryde, F.
    Sadrozinski, H. F. W.
    Sanchez, D.
    Sander, A.
    Parkinson, P. M. S.
    Schalk, T. L.
    Sellerholm, A.
    Sgro, C.
    Smith, D. A.
    Smith, P. D.
    Spandre, G.
    Spinelli, P.
    Starck, J. L.
    Stecker, F. W.
    Strickman, M. S.
    Strong, A. W.
    Suson, D. J.
    Tajima, H.
    Takahashi, H.
    Takahashi, T.
    Tanaka, T.
    Thayer, J. B.
    Thayer, J. G.
    Thompson, D. J.
    Tibaldo, L.
    Torres, D. F.
    Tosti, G.
    Tramacere, A.
    Uchiyama, Y.
    Usher, T. L.
    Vasileiou, V.
    Vilchez, N.
    Vitale, V.
    Waite, A. P.
    Wang, P.
    Winer, B. L.
    Wood, K. S.
    Ylinen, T.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Ziegler, M.
    FERMI LAT OBSERVATION OF DIFFUSE GAMMA RAYS PRODUCED THROUGH INTERACTIONS BETWEEN LOCAL INTERSTELLAR MATTER AND HIGH-ENERGY COSMIC RAYS2009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 703, no 2, p. 1249-1256Article in journal (Refereed)
    Abstract [en]

    Observations by the Large Area Telescope (LAT) on the Fermi mission of diffuse gamma-rays in a mid-latitude region in the third quadrant (Galactic longitude l from 200 degrees to 260 degrees and latitude vertical bar b vertical bar from 22 degrees to 60 degrees) are reported. The region contains no known large molecular cloud and most of the atomic hydrogen is within 1 kpc of the solar system. The contributions of gamma-ray point sources and inverse Compton scattering are estimated and subtracted. The residual gamma-ray intensity exhibits a linear correlation with the atomic gas column density in energy from 100 MeV to 10 GeV. The measured integrated gamma-ray emissivity is (1.63 +/- 0.05) x 10(-26) photons s(-1)sr(-1) H-atom(-1) and (0.66 +/- 0.02) x 10(-26) photons s(-1)sr(-1) H-atom(-1) above 100 MeV and above 300 MeV, respectively, with an additional systematic error of similar to 10%. The differential emissivity from 100 MeV to 10 GeV agrees with calculations based on cosmic ray spectra consistent with those directly measured, at the 10% level. The results obtained indicate that cosmic ray nuclei spectra within 1 kpc from the solar system in regions studied are close to the local interstellar spectra inferred from direct measurements at the Earth within similar to 10%.

  • 14. Abdo, A. A.
    et al.
    Ackermann, M.
    Ajello, M.
    Atwood, W. B.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bastieri, D.
    Baughman, B. M.
    Bechtol, K.
    Bellazzini, R.
    Blandford, R. D.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bouvier, A.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Casandjian, J. M.
    Cavazzuti, E.
    Cecchi, C.
    Charles, E.
    Chekhtman, A.
    Chen, A. W.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Colafrancesco, S.
    Collmar, W.
    Cominsky, L. R.
    Conrad, J.
    Costamante, L.
    Cutini, S.
    Dermer, C. D.
    de Angelis, A.
    de Palma, F.
    Digel, S. W.
    Silva, E. D. E.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Farnier, C.
    Favuzzi, C.
    Fegan, S. J.
    Ferrara, E. C.
    Finke, J.
    Focke, W. B.
    Foschini, L.
    Frailis, M.
    Fuhrmann, L.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gasparrini, D.
    Gehrels, N.
    Germani, S.
    Giebels, B.
    Giglietto, N.
    Giommi, P.
    Giordano, F.
    Giroletti, M.
    Glanzman, T.
    Godfrey, G.
    Grenier, I. A.
    Grondin, M. H.
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Hanabata, Y.
    Harding, A. K.
    Hartman, R. C.
    Hayashida, M.
    Hays, E.
    Healey, S. E.
    Horan, D.
    Hughes, R. E.
    Johannesson, G.
    Johnson, A. S.
    Johnson, R. P.
    Johnson, T. J.
    Johnson, W. N.
    Kadler, M.
    Kamae, T.
    Katagiri, H.
    Kataoka, J.
    Kerr, M.
    Knodlseder, J.
    Kocian, M. L.
    Kuehn, F.
    Kuss, M.
    Lande, J.
    Latronico, L.
    Lemoine-Goumard, M.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Madejski, G. M.
    Makeev, A.
    Massaro, E.
    Mazziotta, M. N.
    McConville, W.
    McEnery, J. E.
    McGlynn, S.
    Meurer, C.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Moiseev, A. A.
    Monte, C.
    Monzani, M. E.
    Moretti, E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nolan, P. L.
    Norris, J. P.
    Nuss, E.
    Ohsugi, T.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Ozaki, M.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pelassa, V.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Razzano, M.
    Razzaque, S.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Reyes, L. C.
    Ritz, S.
    Rochester, L. S.
    Rodriguez, A. Y.
    Romani, R. W.
    Ryde, F.
    Sadrozinski, H. F. W.
    Sanchez, D.
    Sander, A.
    Parkinson, P. M. S.
    Scargle, J. D.
    Schalk, T. L.
    Sellerholm, A.
    Sgro, C.
    Shaw, M. S.
    Smith, D. A.
    Smith, P. D.
    Spandre, G.
    Spinelli, P.
    Starck, J. L.
    Strickman, M. S.
    Suson, D. J.
    Tajima, H.
    Takahashi, H.
    Takahashi, T.
    Tanaka, T.
    Taylor, G. B.
    Thayer, J. B.
    Thayer, J. G.
    Thompson, D. J.
    Tibaldo, L.
    Torres, D. F.
    Tosti, G.
    Tramacere, A.
    Uchiyama, Y.
    Usher, T. L.
    Vilchez, N.
    Villata, M.
    Vitale, V.
    Waite, A. P.
    Winer, B. L.
    Wood, K. S.
    Ylinen, T.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Ziegler, M.
    BRIGHT ACTIVE GALACTIC NUCLEI SOURCE LIST FROM THE FIRST THREE MONTHS OF THE FERMI LARGE AREA TELESCOPE ALL-SKY SURVEY2009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 700, no 1, p. 597-622Article in journal (Refereed)
    Abstract [en]

    The first three months of sky-survey operation with the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope reveal 132 bright sources at |b| > 10 degrees with test statistic greater than 100 ( corresponding to about 10 sigma). Two methods, based on the CGRaBS, CRATES, and BZCat catalogs, indicate high-confidence associations of 106 of these sources with known active galactic nuclei (AGNs). This sample is referred to as the LAT Bright AGN Sample (LBAS). It contains two radio galaxies, namely, Centaurus A and NGC 1275, and 104 blazars consisting of 58 flat spectrum radio quasars (FSRQs), 42 BL Lac objects, and 4 blazars with unknown classification. Four new blazars were discovered on the basis of the LAT detections. Remarkably, the LBAS includes 10 high-energy-peaked BL Lacs (HBLs), sources which were previously difficult to detect in the GeV range. Another 10 lower-confidence associations are found. Only 33 of the sources, plus two at |b| < 10 degrees, were previously detected with Energetic Gamma-Ray Experiment Telescope( EGRET), probably due to variability. The analysis of the gamma-ray properties of the LBAS sources reveals that the average GeV spectra of BL Lac objects are significantly harder than the spectra of FSRQs. No significant correlation between radio and peak gamma-ray fluxes is observed. Blazar log N-log S distributions and luminosity functions are constructed to investigate the evolution of the different blazar classes, with positive evolution indicated for FSRQs but none for BL Lacs. The contribution of LAT blazars to the total extragalactic gamma-ray intensity is estimated.

  • 15. Abdo, A. A.
    et al.
    Ackermann, M.
    Ajello, M.
    Atwood, W. B.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bastieri, D.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Blandford, R. D.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Caliandro, G. A.
    Cameron, R. A.
    Cannon, A.
    Caraveo, P. A.
    Casandjian, J. M.
    Cavazzuti, E.
    Cecchi, C.
    Celik, O.
    Charles, E.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Colafrancesco, S.
    Conrad, J.
    Costamante, L.
    Cutini, S.
    Davis, D. S.
    Dermer, C. D.
    de Angelis, A.
    de Palma, F.
    Digel, S. W.
    Donato, D.
    Silva, E. D. E.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Edmonds, Y.
    Farnier, C.
    Favuzzi, C.
    Fegan, S. J.
    Finke, J.
    Focke, W. B.
    Fortin, P.
    Frailis, M.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gasparrini, D.
    Gehrels, N.
    Georganopoulos, M.
    Germani, S.
    Giebels, B.
    Giglietto, N.
    Giommi, P.
    Giordano, F.
    Giroletti, M.
    Glanzman, T.
    Godfrey, G.
    Grenier, I. A.
    Grondin, M. H.
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Hanabata, Y.
    Harding, A. K.
    Hayashida, M.
    Hays, E.
    Horan, D.
    Johannesson, G.
    Johnson, A. S.
    Johnson, R. P.
    Johnson, T. J.
    Johnson, W. N.
    Kamae, T.
    Katagiri, H.
    Kataoka, J.
    Kawai, N.
    Kerr, M.
    Knodlseder, J.
    Kocian, M. L.
    Kuss, M.
    Lande, J.
    Latronico, L.
    Lemoine-Goumard, M.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Madejski, G. M.
    Makeev, A.
    Mazziotta, M. N.
    McConville, W.
    McEnery, J. E.
    Meurer, C.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Moiseev, A. A.
    Monte, C.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nolan, P. L.
    Norris, J. P.
    Nuss, E.
    Ohsugi, T.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Ozaki, M.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pelassa, V.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Razzano, M.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Ritz, S.
    Rochester, L. S.
    Rodriguez, A. Y.
    Romani, R. W.
    Roth, M.
    Ryde, F.
    Sadrozinski, H. F. W.
    Sambruna, R.
    Sanchez, D.
    Sander, A.
    Parkinson, P. M. S.
    Scargle, J. D.
    Sgro, C.
    Shaw, M. S.
    Smith, D. A.
    Smith, P. D.
    Spandre, G.
    Spinelli, P.
    Strickman, M. S.
    Suson, D. J.
    Tajima, H.
    Takahashi, H.
    Tanaka, T.
    Taylor, G. B.
    Thayer, J. B.
    Thompson, D. J.
    Tibaldo, L.
    Torres, D. F.
    Tosti, G.
    Tramacere, A.
    Uchiyama, Y.
    Usher, T. L.
    Vasileiou, V.
    Vilchez, N.
    Waite, A. P.
    Wang, P.
    Winer, B. L.
    Wood, K. S.
    Ylinen, T.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Ziegler, M.
    Harris, D. E.
    Massaro, F.
    Stawarz, L.
    FERMI LARGE AREA TELESCOPE GAMMA-RAY DETECTION OF THE RADIO GALAXY M872009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 707, no 1, p. 55-60Article in journal (Refereed)
    Abstract [en]

    We report the Fermi Large Area Telescope (LAT) discovery of high-energy (MeV/GeV) gamma-ray emission positionally consistent with the center of the radio galaxy M87, at a source significance of over 10 sigma in 10 months of all-sky survey data. Following the detections of Cen A and Per A, this makes M87 the third radio galaxy seen with the LAT. The faint point-like gamma-ray source has a >100 MeV flux of 2.45 (+/-0.63) x 10(-8) photons cm(-2) s(-1) (photon index = 2.26 +/- 0.13) with no significant variability detected within the LAT observation. This flux is comparable with the previous EGRET upper limit (<2.18 x 10-8 photons cm(-2) s(-1), 2 sigma), thus there is no evidence for a significant MeV/GeV flare on decade timescales. Contemporaneous Chandra and Very Long Baseline Array data indicate low activity in the unresolved X-ray and radio core relative to previous observations, suggesting M87 is in a quiescent overall level over the first year of Fermi-LAT observations. The LAT gamma-ray spectrum is modeled as synchrotron self-Compton (SSC) emission from the electron population producing the radio-to-X-ray emission in the core. The resultant SSC spectrum extrapolates smoothly from the LAT band to the historical-minimum TeV emission. Alternative models for the core and possible contributions from the kiloparsec-scale jet in M87 are considered, and cannot be excluded.

  • 16. Abdo, A. A.
    et al.
    Ackermann, M.
    Ajello, M.
    Atwood, W. B.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bastieri, D.
    Battelino, M.
    Baughman, B. M.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Bloom, E. D.
    Bogaert, G.
    Borgland, A. W.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Caliandro, G. A.
    Cameron, R. A.
    Camilo, F.
    Caraveo, P. A.
    Casandjian, J. M.
    Cecchi, C.
    Charles, E.
    Chekhtman, A.
    Chen, A. W.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Cognard, I.
    Cohen-Tanugi, J.
    Cominsky, L. R.
    Conrad, J.
    Cutini, S.
    Demorest, P.
    Dermer, C. D.
    de Angelis, A.
    de Luca, A.
    de Palma, F.
    Digel, S. W.
    Dormody, M.
    Silva, E. D. E.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Espinoza, C.
    Farnier, C.
    Favuzzi, C.
    Focke, W. B.
    Frailis, M.
    Freire, P. C. C.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gasparrini, D.
    Gehrels, N.
    Germani, S.
    Giebels, B.
    Giglietto, N.
    Giordano, F.
    Glanzman, T.
    Godfrey, G.
    Grenier, I. A.
    Grondin, M. H.
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Hanabata, Y.
    Harding, A. K.
    Hayashida, M.
    Hays, E.
    Hughes, R. E.
    Johannesson, G.
    Johnson, A. S.
    Johnson, R. P.
    Johnson, T. J.
    Johnson, W. N.
    Johnston, S.
    Kamae, T.
    Katagiri, H.
    Kataoka, J.
    Kawai, N.
    Kerr, M.
    Kiziltan, B.
    Knodlseder, J.
    Komin, N.
    Kramer, M.
    Kuehn, F.
    Kuss, M.
    Lande, J.
    Latronico, L.
    Lee, S. H.
    Lemoine-Goumard, M.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Lyne, A. G.
    Makeev, A.
    Manchester, R. N.
    Marelli, M.
    Mazziotta, M. N.
    McConville, W.
    McEnery, J. E.
    McLaughlin, M. A.
    Meurer, C.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Moiseev, A. A.
    Monte, C.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nolan, P. L.
    Noutsos, A.
    Nuss, E.
    Ohsugi, T.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Ozaki, M.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Ransom, S. M.
    Razzano, M.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Ritz, S.
    Rochester, L. S.
    Rodriguez, A. Y.
    Romani, R. W.
    Ryde, F.
    Sadrozinski, H. F. W.
    Sanchez, D.
    Parkinson, P. M. S.
    Sgro, C.
    Sierpowska-Bartosik, A.
    Siskind, E. J.
    Smith, D. A.
    Smith, P. D.
    Spandre, G.
    Spinelli, P.
    Stappers, B. W.
    Starck, J. L.
    Strickman, M. S.
    Suson, D. J.
    Tajima, H.
    Takahashi, H.
    Takahashi, T.
    Tanaka, T.
    Thayer, J. B.
    Thayer, J. G.
    Theureau, G.
    Thompson, D. J.
    Thorsett, S. E.
    Tibaldo, L.
    Torres, D. F.
    Tosti, G.
    Tramacere, A.
    Uchiyama, Y.
    Usher, T. L.
    Van Etten, A.
    Vilchez, N.
    Vitale, V.
    Waite, A. P.
    Wallace, E.
    Watters, K.
    Weltevrede, P.
    Wood, K. S.
    Ylinen, T.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Ziegler, M.
    PULSED GAMMA-RAYS FROM PSR J2021+3651 WITH THE FERMI LARGE AREA TELESCOPE2009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 700, no 2, p. 1059-1066Article in journal (Refereed)
    Abstract [en]

    We report the detection of pulsed gamma-rays from the young, spin-powered radio pulsar PSR J2021+3651 using data acquired with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). The light curve consists of two narrow peaks of similar amplitude separated by 0.468 +/- 0.002 in phase. The first peak lags the maximum of the 2 GHz radio pulse by 0.162 +/- 0.004 +/- 0.01 in phase. The integral gamma-ray photon flux above 100 MeV is (56 +/- 3 +/- 11) x 10(-8) cm(-2) s(-1). The photon spectrum is well described by an exponentially cut-off power law of the form dF/dE = kE(-Gamma)e((-E/Ec)), where the energy E is expressed in GeV. The photon index is Gamma = 1.5 +/- 0.1 +/- 0.1 and the exponential cut-off is E-c = 2.4 +/- 0.3 +/- 0.5 GeV. The first uncertainty is statistical and the second is systematic. The integral photon flux of the bridge is approximately 10% of the pulsed emission, and the upper limit on off-pulse gamma-ray emission from a putative pulsar wind nebula is < 10% of the pulsed emission at the 95% confidence level. Radio polarization measurements yield a rotation measure of RM = 524 +/- 4 rad m(-2) but a poorly constrained magnetic geometry. Re-analysis of Chandra X-ray Observatory data enhanced the significance of the weak X-ray pulsations, and the first peak is roughly phase aligned with the first gamma-ray peak. We discuss the emission region and beaming geometry based on the shape and spectrum of the gamma-ray light curve combined with radio and X-ray measurements, and the implications for the pulsar distance. Gamma-ray emission from the polar cap region seems unlikely for this pulsar.

  • 17. Abdo, A. A.
    et al.
    Ackermann, M.
    Ajello, M.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bastieri, D.
    Battelino, M.
    Baughman, B. M.
    Bechtol, K.
    Bellazzini, R.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Casandjian, J. M.
    Cavazzuti, E.
    Cecchi, C.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Collmar, W.
    Conrad, J.
    Costamante, L.
    Dermer, C. D.
    de Angelis, A.
    de Palma, F.
    Digel, S. W.
    Silva, E. D. E.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Farnier, C.
    Favuzzi, C.
    Focke, W. B.
    Foschini, L.
    Frailis, M.
    Fuhrmann, L.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gehrels, N.
    Germani, S.
    Giebels, B.
    Giglietto, N.
    Giordano, F.
    Giroletti, M.
    Glanzman, T.
    Grenier, I. A.
    Grondin, M. H.
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Hanabata, Y.
    Harding, A. K.
    Hartman, R. C.
    Hayashida, M.
    Hays, E.
    Hughes, R. E.
    Johannesson, G.
    Johnson, A. S.
    Johnson, R. P.
    Johnson, W. N.
    Kamae, T.
    Katagiri, H.
    Kataoka, J.
    Kerr, M.
    Knodlseder, J.
    Kuehn, F.
    Kuss, M.
    Lande, J.
    Latronico, L.
    Lemoine-Goumard, M.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Madejski, G. M.
    Makeev, A.
    Max-Moerbeck, W.
    Mazziotta, M. N.
    McConville, W.
    McEnery, J. E.
    Meurer, C.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Monte, C.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nolan, P. L.
    Norris, J. P.
    Nuss, E.
    Ohsugi, T.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pavlidou, V.
    Pearson, T. J.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Razzano, M.
    Readhead, A.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Richards, J. L.
    Ritz, S.
    Rodriguez, A. Y.
    Romani, R. W.
    Ryde, F.
    Sadrozinski, H. F. W.
    Sambruna, R.
    Sanchez, D.
    Sander, A.
    Parkinson, P. M. S.
    Scargle, J. D.
    Schalk, T. L.
    Sgro, C.
    Smith, D. A.
    Spandre, G.
    Spinelli, P.
    Starck, J. L.
    Stevenson, M.
    Strickman, M. S.
    Suson, D. J.
    Tagliaferri, G.
    Takahashi, H.
    Tanaka, T.
    Thayer, J. G.
    Thompson, D. J.
    Tibaldo, L.
    Tibolla, O.
    Torres, D. F.
    Tosti, G.
    Tramacere, A.
    Uchiyama, Y.
    Usher, T. L.
    Vilchez, N.
    Vitale, V.
    Waite, A. P.
    Winer, B. L.
    Wood, K. S.
    Ylinen, T.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Zensus, J. A.
    Ziegler, M.
    Ghisellini, G.
    Maraschi, L.
    Tavecchio, F.
    Angelakis, E.
    FERMI/LARGE AREA TELESCOPE DISCOVERY OF GAMMA-RAY EMISSION FROM A RELATIVISTIC JET IN THE NARROW-LINE QUASAR PMN J0948+00222009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 699, no 2, p. 976-984Article in journal (Refereed)
    Abstract [en]

    We report the discovery by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope of high-energy. gamma-ray emission from the peculiar quasar PMN J0948+0022 (z = 0.5846). The optical spectrum of this object exhibits rather narrow H beta (FWHM(H beta) similar to 1500 km s(-1)), weak forbidden lines, and is therefore classified as a narrow-line type I quasar. This class of objects is thought to have relatively small black hole mass and to accrete at a high Eddington ratio. The radio loudness and variability of the compact radio core indicate the presence of a relativistic jet. Quasi-simultaneous radio/optical/X-ray and gamma-ray observations are presented. Both radio and gamma-ray emissions (observed over five months) are strongly variable. The simultaneous optical and X-ray data from Swift show a blue continuum attributed to the accretion disk and a hard X-ray spectrum attributed to the jet. The resulting broadband spectral energy distribution (SED) and, in particular, the gamma-ray spectrum measured by Fermi are similar to those of more powerful Flat-Spectrum Radio Quasars (FSRQs). A comparison of the radio and gamma-ray characteristics of PMN J0948+0022 with the other blazars detected by LAT shows that this source has a relatively low radio and gamma-ray power with respect to other FSRQs. The physical parameters obtained from modeling the SED also fall at the low power end of the FSRQ parameter region discussed in Celotti & Ghisellini. We suggest that the similarity of the SED of PMN J0948+0022 to that of more massive and more powerful quasars can be understood in a scenario in which the SED properties depend on the Eddington ratio rather than on the absolute power.

  • 18. Abdo, A. A.
    et al.
    Ackermann, M.
    Ajello, M.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bastieri, D.
    Baughman, B. M.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Casandjian, J. M.
    Cavazzuti, E.
    Cecchi, C.
    Celik, O.
    Celotti, A.
    Chekhtman, A.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Collmar, W.
    Conrad, J.
    Costamante, L.
    Cutini, S.
    de Angelis, A.
    de Palma, F.
    Silva, E. D. E.
    Drell, P. S.
    Dumora, D.
    Farnier, C.
    Favuzzi, C.
    Fegan, S. J.
    Focke, W. B.
    Fortin, P.
    Foschini, L.
    Frailis, M.
    Fuhrmann, L.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gehrels, N.
    Germani, S.
    Giglietto, N.
    Giordano, F.
    Giroletti, M.
    Glanzman, T.
    Godfrey, G.
    Grenier, I. A.
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Hanabata, Y.
    Hays, E.
    Hughes, R. E.
    Jackson, M. S.
    Johannesson, G.
    Johnson, A. S.
    Johnson, W. N.
    Kadler, M.
    Kamae, T.
    Katagiri, H.
    Kataoka, J.
    Kawai, N.
    Kerr, M.
    Knodlseder, J.
    Kocian, M. L.
    Kuss, M.
    Lande, J.
    Latronico, L.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Madejski, G. M.
    Makeev, A.
    Max-Moerbeck, W.
    Mazziotta, M. N.
    McConville, W.
    McEnery, J. E.
    McGlynn, S.
    Meurer, C.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Moiseev, A. A.
    Monte, C.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Nestoras, I.
    Nolan, P. L.
    Norris, J. P.
    Nuss, E.
    Ohsugi, T.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Paneque, D.
    Parent, D.
    Pavlidou, V.
    Pelassa, V.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Razzano, M.
    Readhead, A.
    Reimer, O.
    Reposeur, T.
    Richards, J. L.
    Rodriguez, A. Y.
    Roth, M.
    Ryde, F.
    Sadrozinski, H. F. W.
    Sanchez, D.
    Sander, A.
    Parkinson, P. M. S.
    Scargle, J. D.
    Sgro, C.
    Shaw, M. S.
    Smith, P. D.
    Spandre, G.
    Spinelli, P.
    Strickman, M. S.
    Suson, D. J.
    Tagliaferri, G.
    Tajima, H.
    Takahashi, H.
    Tanaka, T.
    Thayer, J. B.
    Thayer, J. G.
    Thompson, D. J.
    Tibaldo, L.
    Tibolla, O.
    Torres, D. F.
    Tosti, G.
    Tramacere, A.
    Uchiyama, Y.
    Usher, T. L.
    Vasileiou, V.
    Vilchez, N.
    Vitale, V.
    Waite, A. P.
    Wang, P.
    Wehrle, A. E.
    Winer, B. L.
    Wood, K. S.
    Ylinen, T.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Zensus, J. A.
    Ziegler, M.
    Angelakis, E.
    Bailyn, C.
    Bignall, H.
    Blanchard, J.
    Bonning, E. W.
    Buxton, M.
    Canterna, R.
    Carraminana, A.
    Carrasco, L.
    Colomer, F.
    Doi, A.
    Ghisellini, G.
    Hauser, M.
    Hong, X.
    Isler, J.
    Kino, M.
    Kovalev, Y. Y.
    Kovalev, Y. A.
    Krichbaum, T. P.
    Kutyrev, A.
    Lahteenmaki, A.
    van Langevelde, H. J.
    Lister, M. L.
    Macomb, D.
    Maraschi, L.
    Marchili, N.
    Nagai, H.
    Paragi, Z.
    Phillips, C.
    Pushkarev, A. B.
    Recillas, E.
    Roming, P.
    Sekido, M.
    Stark, M. A.
    Szomoru, A.
    Tammi, J.
    Tavecchio, F.
    Tornikoski, M.
    Tzioumis, A. K.
    Urry, C. M.
    Wagner, S.
    MULTIWAVELENGTH MONITORING OF THE ENIGMATIC NARROW-LINE SEYFERT 1 PMN J0948+0022 IN 2009 MARCH-JULY2009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 707, no 1, p. 727-737Article in journal (Refereed)
    Abstract [en]

    Following the recent discovery of gamma rays from the radio-loud narrow-line Seyfert 1 galaxy PMN J0948+0022 (z = 0.5846), we started a multiwavelength campaign from radio to gamma rays, which was carried out between the end of 2009 March and the beginning of July. The source displayed activity at all the observed wavelengths: a general decreasing trend from optical to gamma-ray frequencies was followed by an increase of radio emission after less than two months from the peak of the gamma-ray emission. The largest flux change, about a factor of about 4, occurred in the X-ray band. The smallest was at ultraviolet and near-infrared frequencies, where the rate of the detected photons dropped by a factor 1.6-1.9. At optical wavelengths, where the sampling rate was the highest, it was possible to observe day scale variability, with flux variations up to a factor of about 3. The behavior of PMN J0948+0022 observed in this campaign and the calculated power carried out by its jet in the form of protons, electrons, radiation, and magnetic field are quite similar to that of blazars, specifically of flat-spectrum radio quasars. These results confirm the idea that radio-loud narrow-line Seyfert 1 galaxies host relativistic jets with power similar to that of average blazars.

  • 19. Abdo, A. A.
    et al.
    Ackermann, M.
    Asano, K.
    Atwood, W. B.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Band, D. L.
    Barbiellini, G.
    Bastieri, D.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Bhat, P. N.
    Bissaldi, E.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bouvier, A.
    Bregeon, J.
    Brez, A.
    Briggs, M. S.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Casandjian, J. M.
    Cecchi, C.
    Chaplin, V.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Cominsky, L. R.
    Connaughton, V.
    Conrad, J.
    Cutini, S.
    Dermer, C. D.
    de Angelis, A.
    de Palma, F.
    Digel, S. W.
    Silva, E. D. E.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Farnier, C.
    Favuzzi, C.
    Focke, W. B.
    Frailis, M.
    Fukazawa, Y.
    Fusco, P.
    Gargano, F.
    Gasparrini, D.
    Gehrels, N.
    Germani, S.
    Gibby, L.
    Giebels, B.
    Giglietto, N.
    Giordano, F.
    Glanzman, T.
    Godfrey, G.
    Goldstein, A.
    Granot, J.
    Grenier, I. A.
    Grondin, M. H.
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Hanabata, Y.
    Harding, A. K.
    Hayashida, M.
    Hays, E.
    Hughes, R. E.
    Johannesson, G.
    Johnson, A. S.
    Johnson, W. N.
    Kamae, T.
    Katagiri, H.
    Kataoka, J.
    Kawai, N.
    Kerr, M.
    Knodlseder, J.
    Kocevski, D.
    Komin, N.
    Kouveliotou, C.
    Kuehn, F.
    Kuss, M.
    Latronico, L.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Makeev, A.
    Mazziotta, M. N.
    McBreen, S.
    McEnery, J. E.
    McGlynn, S.
    Meegan, C.
    Meurer, C.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Monte, C.
    Monzani, M. E.
    Moretti, E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nakamori, T.
    Nolan, P. L.
    Norris, J. P.
    Nuss, E.
    Ohno, M.
    Ohsugi, T.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Ozaki, M.
    Paciesas, W. S.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pelassa, V.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Porter, T. A.
    Preece, R.
    Raino, S.
    Rando, R.
    Razzano, M.
    Razzaque, S.
    Reimer, O.
    Reposeur, T.
    Ritz, S.
    Rochester, L. S.
    Rodriguez, A. Y.
    Roth, M.
    Ryde, F.
    Sadrozinski, H. F. W.
    Sanchez, D.
    Sander, A.
    Parkinson, P. M. S.
    Scargle, J. D.
    Sgro, C.
    Siskind, E. J.
    Smith, D. A.
    Smith, P. D.
    Spandre, G.
    Spinelli, P.
    Stamatikos, M.
    Strickman, M. S.
    Suson, D. J.
    Tajima, H.
    Takahashi, H.
    Tanaka, T.
    Thayer, J. B.
    Thayer, J. G.
    Tibaldo, L.
    Torres, D. F.
    Tosti, G.
    Tramacere, A.
    Uchiyama, Y.
    Usher, T. L.
    van der Horst, A. J.
    Vasileiou, V.
    Vilchez, N.
    Vitale, V.
    von Kienlin, A.
    Waite, A. P.
    Wang, P.
    Wilson-Hodge, C.
    Winer, B. L.
    Wood, K. S.
    Ylinen, T.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Ziegler, M.
    FERMI OBSERVATIONS OF HIGH-ENERGY GAMMA-RAY EMISSION FROM GRB 080825C2009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 707, no 1, p. 580-592Article in journal (Refereed)
    Abstract [en]

    The Fermi Gamma-ray Space Telescope has opened a new high-energy window in the study of gamma-ray bursts (GRBs). Here we present a thorough analysis of GRB 080825C, which triggered the Fermi Gamma-ray Burst Monitor (GBM), and was the first firm detection of a GRB by the Fermi Large Area Telescope (LAT). We discuss the LAT event selections, background estimation, significance calculations, and localization for Fermi GRBs in general and GRB 080825C in particular. We show the results of temporal and time-resolved spectral analysis of the GBM and LAT data. We also present some theoretical interpretation of GRB 080825C observations as well as some common features observed in other LAT GRBs.

  • 20. Abdo, A. A.
    et al.
    Ackermann, M.
    Atwood, W. B.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bastieri, D.
    Battelino, M.
    Baughman, B. M.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Casandjian, J. M.
    Cecchi, C.
    Charles, E.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cognard, I.
    Cohen-Tanugi, J.
    Cominsky, L. R.
    Conrad, J.
    Cutini, S.
    Dermer, C. D.
    De Angelis, A.
    De Palma, F.
    Digel, S. W.
    Dormody, M.
    Silva, E. D. E.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Farnier, C.
    Favuzzi, C.
    Focke, W. B.
    Frailis, M.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gasparrini, D.
    Gehrels, N.
    Germani, S.
    Giebels, B.
    Giglietto, N.
    Giordano, F.
    Glanzman, T.
    Godfrey, G.
    Grenier, I. A.
    Grondin, M. H.
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Hanabata, Y.
    Harding, A. K.
    Hayashida, M.
    Hays, E.
    Hughes, R. E.
    Johannesson, G.
    Johnson, A. S.
    Johnson, R. P.
    Johnson, T. J.
    Johnson, W. N.
    Kamae, T.
    Katagiri, H.
    Kataoka, J.
    Kawai, N.
    Kerr, M.
    Knodlseder, J.
    Kocian, M. L.
    Komin, N.
    Kuehn, F.
    Kuss, M.
    Lande, J.
    Latronico, L.
    Lee, S. H.
    Lemoine-Goumard, M.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Madejski, G. M.
    Makeev, A.
    Marelli, M.
    Mazziotta, M. N.
    McConville, W.
    McEnery, J. E.
    Meurer, C.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Moiseev, A. A.
    Monte, C.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nolan, P. L.
    Nuss, E.
    Ohsugi, T.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Pancrazi, B.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Razzano, M.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Ritz, S.
    Rochester, L. S.
    Rodriguez, A. Y.
    Romani, R. W.
    Ryde, F.
    Sadrozinski, H. F. W.
    Sanchez, D.
    Sander, A.
    Parkinson, P. M. S.
    Sgro, C.
    Siskind, E. J.
    Smith, D. A.
    Smith, P. D.
    Spandre, G.
    Spinelli, P.
    Starck, J. L.
    Strickman, M. S.
    Suson, D. J.
    Tajima, H.
    Takahashi, H.
    Tanaka, T.
    Thayer, J. B.
    Thayer, J. G.
    Theureau, G.
    Thompson, D. J.
    Tibaldo, L.
    Torres, D. F.
    Tosti, G.
    Tramacere, A.
    Uchiyama, Y.
    Usher, T. L.
    Van Etten, A.
    Vilchez, N.
    Vitale, V.
    Waite, A. P.
    Watters, K.
    Webb, N.
    Wood, K. S.
    Ylinen, T.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Ziegler, M.
    PULSED GAMMA RAYS FROM THE MILLISECOND PULSAR J0030+0451 WITH THE FERMI LARGE AREA TELESCOPE2009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 699, no 2, p. 1171-1177Article in journal (Refereed)
    Abstract [en]

    We report the discovery of gamma-ray pulsations from the nearby isolated millisecond pulsar (MSP) PSR J0030+0451 with the Large Area Telescope on the Fermi Gamma-ray Space Telescope (formerly GLAST). This discovery makes PSR J0030+0451 the second MSP to be detected in gamma rays after PSR J0218+4232, observed by the EGRET instrument on the Compton Gamma-Ray Observatory. The spin-down power (E) over dot = 3.5 x 10(33) erg s(-1) is an order of magnitude lower than the empirical lower bound of previously known gamma-ray pulsars. The emission profile is characterized by two narrow peaks, 0.07 +/- 0.01 and 0.08 +/- 0.02 wide, respectively, separated by 0.44 +/- 0.02 in phase. The first gamma-ray peak falls 0.15 +/- 0.01 after the main radio peak. The pulse shape is similar to that of the "normal" gamma-ray pulsars. An exponentially cutoff power-law fit of the emission spectrum leads to an integral photon flux above 100 MeV of (6.76 +/- 1.05 +/- 1.35) x 10(-8) cm(-2) s(-1) with cutoff energy (1.7 +/- 0.4 +/- 0.5) GeV. Based on its parallax distance of (300 +/- 90) pc, we obtain a gamma-ray efficiency L-gamma/E similar or equal to 15% for the conversion of spin-down energy rate into gamma-ray radiation, assuming isotropic emission.

  • 21. Abdo, A. A.
    et al.
    Ackermann, M.
    Atwood, W. B.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bastieri, D.
    Baughman, B. M.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Blandford, R. D.
    Bloom, E. D.
    Bogaert, G.
    Bonamente, E.
    Borgland, A. W.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Casandjian, J. M.
    Cavazzuti, E.
    Cecchi, C.
    Charles, E.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Colafrancesco, S.
    Conrad, J.
    Costamante, L.
    Cutini, S.
    Dermer, C. D.
    de Angelis, A.
    de Palma, F.
    Digel, S. W.
    Silva, E. D. E.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Edmonds, Y.
    Farnier, C.
    Favuzzi, C.
    Ferrara, E. C.
    Fleury, P.
    Focke, W. B.
    Foschini, L.
    Frailis, M.
    Fuhrmann, L.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gasparrini, D.
    Gehrels, N.
    Germani, S.
    Giebels, B.
    Giglietto, N.
    Giordano, F.
    Giroletti, M.
    Glanzman, T.
    Godfrey, G.
    Grenier, I. A.
    Grondin, M. H.
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Harding, A. K.
    Hartman, R. C.
    Hayashida, M.
    Hays, E.
    Healey, S. E.
    Hughes, R. E.
    Johannesson, G.
    Johnson, A. S.
    Johnson, R. P.
    Johnson, W. N.
    Kadler, M.
    Kamae, T.
    Katagiri, H.
    Kataoka, J.
    Kawai, N.
    Kerr, M.
    Knodlseder, J.
    Kocian, M. L.
    Kuehn, F.
    Kuss, M.
    Latronico, L.
    Lee, S. H.
    Lemoine-Goumard, M.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Madejski, G. M.
    Makeev, A.
    Marelli, M.
    Mazziotta, M. N.
    McEnery, J. E.
    McGlynn, S.
    Meurer, C.
    Michelson, P. F.
    Mitthumsiri, W.
    Mizuno, T.
    Moiseev, A. A.
    Monte, C.
    Monzani, M. E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nolan, P. L.
    Nuss, E.
    Ohno, M.
    Ohsugi, T.
    Ojha, R.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pepe, M.
    Pesce-Rollins, M.
    Piron, F.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Razzano, M.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Reyes, L. C.
    Ritz, S.
    Rochester, L. S.
    Rodriguez, A. Y.
    Romani, R. W.
    Roth, M.
    Ryde, F.
    Sadrozinski, H. F. W.
    Sambruna, R.
    Sanchez, D.
    Sander, A.
    Parkinson, P. M. S.
    Sgro, C.
    Shaw, M. S.
    Siskind, E. J.
    Smith, D. A.
    Smith, P. D.
    Spandre, G.
    Spinelli, P.
    Starck, J. L.
    Strickman, M. S.
    Suson, D. J.
    Tajima, H.
    Takahashi, H.
    Tanaka, T.
    Thayer, J. B.
    Thayer, J. G.
    Thompson, D. J.
    Tibaldo, L.
    Tibolla, O.
    Torres, D. F.
    Tosti, G.
    Tramacere, A.
    Usher, T. L.
    Vilchez, N.
    Vitale, V.
    Waite, A. P.
    Wang, P.
    Winer, B. L.
    Wood, K. S.
    Ylinen, T.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Ziegler, M.
    Edwards, P. G.
    Chester, M. M.
    Burrows, D. N.
    Hauser, M.
    Wagner, S.
    FERMI/LARGE AREA TELESCOPE DISCOVERY OF GAMMA-RAY EMISSION FROM THE FLAT-SPECTRUM RADIO QUASAR PKS 1454-3542009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 697, no 1, p. 934-941Article in journal (Refereed)
    Abstract [en]

    We report the discovery by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope of high-energy gamma-ray (GeV) emission from the flat-spectrum radio quasar PKS 1454-354 (z = 1.424). On 2008 September 4, the source rose to a peak flux of (3.5 +/- 0.7) x 10(-6) ph cm(-2) s(-1) (E > 100 MeV) on a timescale of hours and then slowly dropped over the following 2 days. No significant spectral changes occurred during the flare. Fermi/LAT observations also showed that PKS 1454-354 is the most probable counterpart of the unidentified EGRET source 3EG J1500-3509. Multiwavelength measurements performed during the following days (7 September with Swift; 6-7 September with the ground-based optical telescope Automated Telescope for Optical Monitoring; 13 September with the Australia Telescope Compact Array) resulted in radio, optical, UV, and X-ray fluxes greater than archival data, confirming the activity of PKS 1454-354.

  • 22. Abdo, A. A.
    et al.
    Ackermann, M.
    Atwood, W. B.
    Bagagli, R.
    Baldini, L.
    Ballet, J.
    Band, D. L.
    Barbiellini, G.
    Baring, M. G.
    Bartelt, J.
    Bastieri, D.
    Baughman, B. M.
    Bechtol, K.
    Bellardi, F.
    Bellazzini, R.
    Berenji, B.
    Bisello, D.
    Blandford, R. D.
    Bloom, E. D.
    Bogart, J. R.
    Bonamente, E.
    Borgland, A. W.
    Bouvier, A.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Caliandro, G. A.
    Cameron, R. A.
    Camilo, F.
    Caraveo, P. A.
    Casandjian, J. M.
    Ceccanti, M.
    Cecchi, C.
    Charles, E.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cognard, I.
    Cohen-Tanugi, J.
    Cominsky, L. R.
    Conrad, J.
    Corbet, R.
    Corucci, L.
    Cutini, S.
    Davis, D. S.
    DeKlotz, M.
    Dermer, C. D.
    de Angelis, A.
    de Palma, F.
    Digel, S. W.
    Dormody, M.
    Silva, E. D. E.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Espinoza, C.
    Farnier, C.
    Favuzzi, C.
    Flath, D. L.
    Fleury, P.
    Focke, W. B.
    Frailis, M.
    Friere, P. C. C.
    Fukazawa, Y.
    Funk, S.
    Fusco, P.
    Gargano, F.
    Gasparrini, D.
    Gehrels, N.
    Germani, S.
    Giannitrapani, R.
    Giebels, B.
    Giglietto, N.
    Giordano, F.
    Glanzman, T.
    Godfrey, G.
    Gotthelf, E. V.
    Grenier, I. A.
    Grondin, M. H.
    Grove, J. E.
    Guillemot, L.
    Guiriec, S.
    Haller, G.
    Harding, A. K.
    Hart, P. A.
    Hartman, R. C.
    Hays, E.
    Hobbs, G.
    Hughes, R. E.
    Johannesson, G.
    Johnson, A. S.
    Johnson, R. P.
    Johnson, T. J.
    Johnson, W. N.
    Johnston, S.
    Kamae, T.
    Kanbach, G.
    Kaspi, V. M.
    Katagiri, H.
    Kataoka, J.
    Kavelaars, A.
    Kawai, N.
    Kelly, H.
    Kerr, M.
    Kiziltan, B.
    Klamra, W.
    Knodlseder, J.
    Kramer, M.
    Kuehn, F.
    Kuss, M.
    Lande, J.
    Landriu, D.
    Latronico, L.
    Lee, B.
    Lee, S. H.
    Lemoine-Goumard, M.
    Livingstone, M.
    Longo, F.
    Loparco, F.
    Lott, B.
    Lovellette, M. N.
    Lubrano, P.
    Lyne, A. G.
    Madejski, G. M.
    Makeev, A.
    Manchester, R. N.
    Marangelli, B.
    Marelli, M.
    Mazziotta, M. N.
    McEnery, J. E.
    McGlynn, S.
    McLaughlin, M. A.
    Menon, N.
    Meurer, C.
    Michelson, P. F.
    Mineo, T.
    Mirizzi, N.
    Mitthumsiri, W.
    Mizuno, T.
    Moiseev, A. A.
    Mongelli, M.
    Monte, C.
    Monzani, M. E.
    Moretti, E.
    Morselli, A.
    Moskalenko, I. V.
    Murgia, S.
    Nakamori, T.
    Nolan, P. L.
    Noutsos, A.
    Nuss, E.
    Ohsugi, T.
    Omodei, N.
    Orlando, E.
    Ormes, J. F.
    Ozaki, M.
    Paccagnella, A.
    Paneque, D.
    Panetta, J. H.
    Parent, D.
    Pearce, M.
    Pepe, M.
    Perchiazzi, M.
    Pesce-Rollins, M.
    Pieri, L.
    Pinchera, M.
    Piron, F.
    Porter, T. A.
    Raino, S.
    Rando, R.
    Ransom, S. M.
    Rapposelli, E.
    Razzano, M.
    Reimer, A.
    Reimer, O.
    Reposeur, T.
    Reyes, L. C.
    Ritz, S.
    Rochester, L. S.
    Rodriguez, A. Y.
    Romani, R. W.
    Roth, M.
    Ryde, F.
    Sacchetti, A.
    Sadrozinski, H. F. W.
    Saggini, N.
    Sanchez, D.
    Sander, A.
    Parkinson, P. M. S.
    Segal, K. N.
    Sellerholm, A.
    Sgro, C.
    Siskind, E. J.
    Smith, D. A.
    Smith, P. D.
    Spandre, G.
    Spinelli, P.
    Stamatikos, M.
    Starck, J. L.
    Stecker, F. W.
    Stephens, T. E.
    Strickman, M. S.
    Strong, A. W.
    Suson, D. J.
    Tajima, H.
    Takahashi, H.
    Takahashi, T.
    Tanaka, T.
    Tenze, A.
    Thayer, J. B.
    Thayer, J. G.
    Theureau, G.
    Thompson, D. J.
    Thorsett, S. E.
    Tibaldo, L.
    Tibolla, O.
    Torres, D. F.
    Tramacere, A.
    Turri, M.
    Usher, T. L.
    Vigiani, L.
    Vilchez, N.
    Vitale, V.
    Waite, A. P.
    Wang, P.
    Watters, K.
    Weltevrede, P.
    Winer, B. L.
    Wood, K. S.
    Ylinen, T.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Ziegler, M.
    FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE VELA PULSAR2009In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 696, no 2, p. 1084-1093Article in journal (Refereed)
    Abstract [en]

    The Vela pulsar is the brightest persistent source in the GeV sky and thus is the traditional first target for new gamma-ray observatories. We report here on initial Fermi Large Area Telescope observations during verification phase pointed exposure and early sky survey scanning. We have used the Vela signal to verify Fermi timing and angular resolution. The high-quality pulse profile, with some 32,400 pulsed photons at E >= 0.03 GeV, shows new features, including pulse structure as fine as 0.3 ms and a distinct third peak, which shifts in phase with energy. We examine the high-energy behavior of the pulsed emission; initial spectra suggest a phase-averaged power-law index of Gamma = 1.51(-0.04)(+0.05) with an exponential cutoff at E-c = 2.9 +/- 0.1 GeV. Spectral fits with generalized cutoffs of the form e(-(E/Ec)b) require b <= 1, which is inconsistent with magnetic pair attenuation, and thus favor outer-magnetosphere emission models. Finally, we report on upper limits to any unpulsed component, as might be associated with a surrounding pulsar wind nebula.

  • 23.
    Abeysekara, A. U.
    et al.
    University of Utah, USA.
    Archambault, S.
    McGill University, Canada.
    Archer, A.
    Washington University in St. Louis, USA.
    Benbow, W.
    Smithsonian Astrophysical Observatory, USA.
    Bird, R.
    University College Dublin, Ireland.
    Buchovecky, M.
    University of California Los Angeles, USA.
    Buckley, J. H.
    Washington University in St. Louis, USA.
    Bugaev, V.
    Washington University in St. Louis, USA.
    Byrum, K.
    Argonne National Laboratory, USA.
    Cerruti, M.
    Smithsonian Astrophysical Observatory, USA.
    Chen, X.
    Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany.;DESY, Platanenallee 6, D-15738 Zeuthen, Germany..
    Ciupik, L.
    Adler Planetarium & Astron Museum, Dept Astron, Chicago, IL 60605 USA..
    Cui, W.
    Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA.;Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China.;Tsinghua Univ, Ctr Astrophys, Beijing 100084, Peoples R China..
    Dickinson, H. J.
    Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA..
    Eisch, J. D.
    Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA..
    Errando, M.
    Washington Univ, Dept Phys, St Louis, MO 63130 USA.;Columbia Univ, Barnard Coll, Dept Phys & Astron, New York, NY 10027 USA..
    Falcone, A.
    Penn State Univ, Davey Lab 525, Dept Astron & Astrophys, University Pk, PA 16802 USA..
    Feng, Q.
    Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA..
    Finley, J. P.
    Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA..
    Fleischhack, H.
    DESY, Platanenallee 6, D-15738 Zeuthen, Germany..
    Fortson, L.
    Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA..
    Furniss, A.
    Calif State Univ East Bay, Dept Phys, Hayward, CA 94542 USA..
    Gillanders, G. H.
    Natl Univ Ireland Galway, Sch Phys, Univ Rd, Galway, Ireland..
    Griffin, S.
    McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada..
    Grube, J.
    Adler Planetarium & Astron Museum, Dept Astron, Chicago, IL 60605 USA..
    Hutten, M.
    DESY, Platanenallee 6, D-15738 Zeuthen, Germany..
    Hakansson, N.
    Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany..
    Hanna, D.
    McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada..
    Holder, J.
    Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA.;Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA..
    Humensky, T. B.
    Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA..
    Johnson, C. A.
    Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA.;Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA..
    Kaaret, P.
    Univ Iowa, Dept Phys & Astron, Van Allen Hall, Iowa City, IA 52242 USA..
    Kar, P.
    Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA..
    Kertzman, M.
    Depauw Univ, Dept Phys & Astron, Greencastle, IN 46135 USA..
    Kieda, D.
    Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA..
    Krause, M.
    DESY, Platanenallee 6, D-15738 Zeuthen, Germany..
    Krennrich, F.
    Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA..
    Kumar, S.
    Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA.;Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA..
    Lang, M. J.
    Natl Univ Ireland Galway, Sch Phys, Univ Rd, Galway, Ireland..
    Maier, G.
    DESY, Platanenallee 6, D-15738 Zeuthen, Germany..
    McArthur, S.
    Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA..
    McCann, A.
    McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada..
    Meagher, K.
    Georgia Inst Technol, Sch Phys, 837 State St NW, Atlanta, GA 30332 USA.;Georgia Inst Technol, Ctr Relativist Astrophys, 837 State St NW, Atlanta, GA 30332 USA..
    Moriarty, P.
    Natl Univ Ireland Galway, Sch Phys, Univ Rd, Galway, Ireland..
    Mukherjee, R.
    Columbia Univ, Barnard Coll, Dept Phys & Astron, New York, NY 10027 USA..
    Nguyen, T.
    Georgia Inst Technol, Sch Phys, 837 State St NW, Atlanta, GA 30332 USA.;Georgia Inst Technol, Ctr Relativist Astrophys, 837 State St NW, Atlanta, GA 30332 USA..
    Nieto, D.
    Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA..
    Ong, R. A.
    Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA..
    Otte, A. N.
    Georgia Inst Technol, Sch Phys, 837 State St NW, Atlanta, GA 30332 USA.;Georgia Inst Technol, Ctr Relativist Astrophys, 837 State St NW, Atlanta, GA 30332 USA..
    Park, N.
    Univ Chicago, Enrico Fermi Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA..
    Pelassa, V.
    Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA..
    Pohl, M.
    Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany.;DESY, Platanenallee 6, D-15738 Zeuthen, Germany..
    Popkow, A.
    Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA..
    Pueschel, E.
    Univ Coll Dublin, Sch Phys, Dublin 4, Ireland..
    Quinn, J.
    Univ Coll Dublin, Sch Phys, Dublin 4, Ireland..
    Ragan, K.
    McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada..
    Reynolds, P. T.
    Cork Inst Technol, Dept Phys Sci, Cork, Ireland..
    Richards, G. T.
    Georgia Inst Technol, Sch Phys, 837 State St NW, Atlanta, GA 30332 USA.;Georgia Inst Technol, Ctr Relativist Astrophys, 837 State St NW, Atlanta, GA 30332 USA..
    Roache, E.
    Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA..
    Rulten, C.
    Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA..
    Santander, M.
    Columbia Univ, Barnard Coll, Dept Phys & Astron, New York, NY 10027 USA..
    Sembroski, G. H.
    Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA..
    Shahinyan, K.
    Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA..
    Staszak, D.
    Univ Chicago, Enrico Fermi Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA..
    Telezhinsky, I.
    Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany.;DESY, Platanenallee 6, D-15738 Zeuthen, Germany..
    Tucci, J. V.
    Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA..
    Tyler, J.
    McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada..
    Wakely, S. P.
    Univ Chicago, Enrico Fermi Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA..
    Weiner, O. M.
    Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA..
    Weinstein, A.
    Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA..
    Wilhelm, A.
    Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany.;DESY, Platanenallee 6, D-15738 Zeuthen, Germany..
    Williams, D. A.
    Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA.;Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA..
    Fegan, S.
    Univ Paris Saclay, CNRS, IN2P3, Lab Leprince Ringuet,Ecole Polytech, F-91128 Palaiseau, France..
    Giebels, B.
    Univ Paris Saclay, CNRS, IN2P3, Lab Leprince Ringuet,Ecole Polytech, F-91128 Palaiseau, France..
    Horan, D.
    Univ Paris Saclay, CNRS, IN2P3, Lab Leprince Ringuet,Ecole Polytech, F-91128 Palaiseau, France..
    Berdyugin, A.
    Univ Turku, Dept Phys & Astron, Tuorla Observ, Turku, Finland..
    Kuan, J.
    Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA..
    Lindfors, E.
    Univ Turku, Dept Phys & Astron, Tuorla Observ, Turku, Finland..
    Nilsson, K.
    Univ Turku, Finnish Ctr Astron ESO, Turku, Finland..
    Oksanen, A.
    Jyvaskylan Sirius Ry, Nyrola Observ, Palokka, Finland..
    Prokoph, Heike
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Reinthal, R.
    Univ Turku, Dept Phys & Astron, Tuorla Observ, Turku, Finland..
    Takalo, L.
    Univ Turku, Dept Phys & Astron, Tuorla Observ, Turku, Finland..
    Zefi, F.
    Univ Paris Saclay, CNRS, IN2P3, Lab Leprince Ringuet,Ecole Polytech, F-91128 Palaiseau, France..
    A Luminous and Isolated Gamma-Ray Flare from the Blazar B2 1215+302017In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 836, no 2, article id 205Article in journal (Refereed)
    Abstract [en]

    B2 1215+30 is a BL-Lac-type blazar that was first detected at TeV energies by the MAGIC atmospheric Cherenkov telescopes and subsequently confirmed by the Very Energetic Radiation Imaging Telescope Array System (VERITAS) observatory with data collected between 2009 and 2012. In 2014 February 08, VERITAS detected a large-amplitude flare from B2. 1215+30 during routine monitoring observations of the blazar 1ES. 1218+304, located in the same field of view. The TeV flux reached 2.4 times the Crab Nebula flux with a variability timescale of <3.6 hr. Multiwavelength observations with Fermi-LAT, Swift, and the Tuorla Observatory revealed a correlated high GeV flux state and no significant optical counterpart to the flare, with a spectral energy distribution where the gamma-ray luminosity exceeds the synchrotron luminosity. When interpreted in the framework of a onezone leptonic model, the observed emission implies a high degree of beaming, with Doppler factor delta > 10, and an electron population with spectral index p < 2.3.

  • 24. Abramowski, A.
    et al.
    Acero, F.
    Aharonian, F.
    Akhperjanian, A. G.
    Anton, G.
    Balzer, A.
    Barnacka, A.
    Becherini, Yvonne
    Université Paris Diderot.
    Becker, J.
    Bernloehr, K.
    Birsin, E.
    Biteau, J.
    Bochow, A.
    Boisson, C.
    Bolmont, J.
    Bordas, P.
    Brucker, J.
    Brun, F.
    Brun, P.
    Bulik, T.
    Buesching, I.
    Carrigan, S.
    Casanova, S.
    Cerruti, M.
    Chadwick, P. M.
    Charbonnier, A.
    Chaves, R. C. G.
    Cheesebrough, A.
    Cologna, G.
    Conrad, J.
    Couturier, C.
    Dalton, M.
    Daniel, M. K.
    Davids, I. D.
    Degrange, B.
    Deil, C.
    Dickinson, H. J.
    Djannati-Atai, A.
    Domainko, W.
    Drury, L. O 'C.
    Dubus, G.
    Dutson, K.
    Dyks, J.
    Dyrda, M.
    Egberts, K.
    Eger, P.
    Espigat, P.
    Fallon, L.
    Fegan, S.
    Feinstein, F.
    Fernandes, M. V.
    Fiasson, A.
    Fontaine, G.
    Foerster, A.
    Fuessling, M.
    Gajdus, M.
    Gallant, Y. A.
    Garrigoux, T.
    Gast, H.
    Gerard, L.
    Giebels, B.
    Glicenstein, J. F.
    Glueck, B.
    Goering, D.
    Grondin, M. -H
    Haeffner, S.
    Hague, J. D.
    Hahn, J.
    Hampf, D.
    Harris, J.
    Hauser, M.
    Heinz, S.
    Heinzelmann, G.
    Henri, G.
    Hermann, G.
    Hillert, A.
    Hinton, J. A.
    Hofmann, W.
    Hofverberg, P.
    Holler, M.
    Horns, D.
    Jacholkowska, A.
    Jahn, C.
    Jamrozy, M.
    Jung, I.
    Kastendieck, M. A.
    Katarzynski, K.
    Katz, U.
    Kaufmann, S.
    Khelifi, B.
    Klochkov, D.
    Kluzniak, W.
    Kneiske, T.
    Komin, Nu
    Kosack, K.
    Kossakowski, R.
    Krayzel, F.
    Laffon, H.
    Lamanna, G.
    Lenain, J. -P
    Lennarz, D.
    Lohse, T.
    Lopatin, A.
    Lu, C. -C
    Marandon, V.
    Marcowith, A.
    Masbou, J.
    Maurin, G.
    Maxted, N.
    Mayer, M.
    McComb, T. J. L.
    Medina, M. C.
    Mehault, J.
    Moderski, R.
    Mohamed, M.
    Moulin, E.
    Naumann, C. L.
    Naumann-Godo, M.
    de Naurois, M.
    Nedbal, D.
    Nekrassov, D.
    Nguyen, N.
    Nicholas, B.
    Niemiec, J.
    Nolan, S. J.
    Ohm, S.
    Wilhelmi, E. de Ona
    Opitz, B.
    Ostrowski, M.
    Oya, I.
    Panter, M.
    Arribas, M. Paz
    Pekeur, N. W.
    Pelletier, G.
    Perez, J.
    Petrucci, P. -O
    Peyaud, B.
    Pita, S.
    Puehlhofer, G.
    Punch, Michael
    Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France.
    Quirrenbach, A.
    Raue, M.
    Reimer, A.
    Reimer, O.
    Renaud, M.
    de los Reyes, R.
    Rieger, F.
    Ripken, J.
    Rob, L.
    Rosier-Lees, S.
    Rowell, G.
    Rudak, B.
    Rulten, C. B.
    Sahakian, V.
    Sanchez, D. A.
    Santangelo, A.
    Schlickeiser, R.
    Schulz, A.
    Schwanke, U.
    Schwarzburg, S.
    Schwemmer, S.
    Sheidaei, F.
    Skilton, J. L.
    Sol, H.
    Spengler, G.
    Stawarz, L.
    Steenkamp, R.
    Stegmann, C.
    Stinzing, F.
    Stycz, K.
    Sushch, I.
    Szostek, A.
    Tavernet, J. -P
    Terrier, R.
    Tluczykont, M.
    Valerius, K.
    van Eldik, C.
    Vasileiadis, G.
    Venter, C.
    Viana, A.
    Vincent, P.
    Voelk, H. J.
    Volpe, F.
    Vorobiov, S.
    Vorster, M.
    Wagner, S. J.
    Ward, M.
    White, R.
    Wierzcholska, A.
    Zacharias, M.
    Zajczyk, A.
    Zdziarski, A. A.
    Zech, A.
    Zechlin, H. -S
    Spectral Analysis and Interpretation of the γ-ray Emission from the Starburst Galaxy NGC 2532012In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 757, no 2, p. 158-Article in journal (Refereed)
    Abstract [en]

    Very high energy (VHE; E >= 100 GeV) and high-energy (HE; 100 MeV <= E <= 100 GeV) data from gamma-ray observations performed with the H. E. S. S. telescope array and the Fermi-LAT instrument, respectively, are analyzed in order to investigate the non-thermal processes in the starburst galaxy NGC 253. The VHE gamma-ray data can be described by a power law in energy with differential photon index Gamma = 2.14 +/- 0.18(stat) +/- 0.30(sys) and differential flux normalization at 1 TeV of F-0 = (9.6 +/- 1.5(stat)(+5.7, -2.9)(sys)) x 10(-14) TeV-1 cm(-2) s(-1). A power-law fit to the differential HE gamma-ray spectrum reveals a photon index of Gamma = 2.24 +/- 0.14(stat) +/- 0.03(sys) and an integral flux between 200 MeV and 200 GeV of F(0.2-200 GeV) = (4.9 +/- 1.0(stat) +/- 0.3(sys)) x 10(-9) cm(-2) s(-1). No evidence for a spectral break or turnover is found over the dynamic range of both the LAT instrument and the H.E.S.S. experiment: a combined fit of a power law to the HE and VHE gamma-ray data results in a differential photon index Gamma = 2.34 +/- 0.03 with a p-value of 30%. The gamma-ray observations indicate that at least about 20% of the energy of the cosmic rays (CRs) capable of producing hadronic interactions is channeled into pion production. The smooth alignment between the spectra in the HE and VHE gamma-ray domain suggests that the same transport processes dominate in the entire energy range. Advection is most likely responsible for charged particle removal from the starburst nucleus from GeV to multiple TeV energies. In a hadronic scenario for the gamma-ray production, the single overall power-law spectrum observed would therefore correspond to the mean energy spectrum produced by the ensemble of CR sources in the starburst region.

  • 25. Abramowski, A.
    et al.
    Acero, F.
    Aharonian, F.
    Akhperjanian, A. G.
    Anton, G.
    Balzer, A.
    Barnacka, A.
    de Almeida, U. Barres
    Bazer-Bachi, A. R.
    Becherini, Yvonne
    Becker, J.
    Behera, B.
    Bernloehr, K.
    Bochow, A.
    Boisson, C.
    Bolmont, J.
    Bordas, P.
    Borrel, V.
    Brucker, J.
    Brun, F.
    Brun, P.
    Bulik, T.
    Buesching, I.
    Carrigan, S.
    Casanova, S.
    Cerruti, M.
    Chadwick, P. M.
    Charbonnier, A.
    Chaves, R. C. G.
    Cheesebrough, A.
    Chounet, L-M
    Clapson, A. C.
    Coignet, G.
    Conrad, J.
    Dalton, M.
    Daniel, M. K.
    Davids, I. D.
    Degrange, B.
    Deil, C.
    Dickinson, H. J.
    Djannati-Atai, A.
    Domainko, W.
    Drury, L. O ' C
    Dubois, F.
    Dubus, G.
    Dyks, J.
    Dyrda, M.
    Egberts, K.
    Eger, P.
    Espigat, P.
    Fallon, L.
    Farnier, C.
    Fegan, S.
    Feinstein, F.
    Fernandes, M. V.
    Fiasson, A.
    Fontaine, G.
    Foerster, A.
    Fuessling, M.
    Gallant, Y. A.
    Gast, H.
    Gerard, L.
    Gerbig, D.
    Giebels, B.
    Glicenstein, J. F.
    Glueck, B.
    Goret, P.
    Goering, D.
    Haeffner, S.
    Hague, J. D.
    Hampf, D.
    Hauser, M.
    Heinz, S.
    Heinzelmann, G.
    Henri, G.
    Hermann, G.
    Hinton, J. A.
    Hoffmann, A.
    Hofmann, W.
    Hofverberg, P.
    Holler, M.
    Horns, D.
    Jacholkowska, A.
    de Jager, O. C.
    Jahn, C.
    Jamrozy, M.
    Jung, I.
    Kastendieck, M. A.
    Katarzynski, K.
    Katz, U.
    Kaufmann, S.
    Keogh, D.
    Khangulyan, D.
    Khelifi, B.
    Klochkov, D.
    Kluzniak, W.
    Kneiske, T.
    Komin, Nu
    Kosack, K.
    Kossakowski, R.
    Laffon, H.
    Lamanna, G.
    Lennarz, D.
    Lohse, T.
    Lopatin, A.
    Lu, C-C
    Marandon, V.
    Marcowith, A.
    Masbou, J.
    Maurin, D.
    Maxted, N.
    McComb, T. J. L.
    Medina, M. C.
    Mehault, J.
    Moderski, R.
    Moulin, E.
    Naumann, C. L.
    Naumann-Godo, M.
    de Naurois, M.
    Nedbal, D.
    Nekrassov, D.
    Nguyen, N.
    Nicholas, B.
    Niemiec, J.
    Nolan, S. J.
    Ohm, S.
    Olive, J-P
    Wilhelmi, E. de Ona
    Opitz, B.
    Ostrowski, M.
    Panter, M.
    Arribas, M. Paz
    Pedaletti, G.
    Pelletier, G.
    Petrucci, P-O
    Pita, S.
    Puehlhofer, G.
    Punch, Michael
    Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France.
    Quirrenbach, A.
    Raue, M.
    Rayner, S. M.
    Reimer, A.
    Reimer, O.
    Renaud, M.
    de los Reyes, R.
    Rieger, F.
    Ripken, J.
    Rob, L.
    Rosier-Lees, S.
    Rowell, G.
    Rudak, B.
    Rulten, C. B.
    Ruppel, J.
    Ryde, F.
    Sahakian, V.
    Santangelo, A.
    Schlickeiser, R.
    Schoeck, F. M.
    Schulz, A.
    Schwanke, U.
    Schwarzburg, S.
    Schwemmer, S.
    Sikora, M.
    Skilton, J. L.
    Sol, H.
    Spengler, G.
    Stawarz, L.
    Steenkamp, R.
    Stegmann, C.
    Stinzing, F.
    Stycz, K.
    Sushch, I.
    Szostek, A.
    Tavernet, J-P
    Terrier, R.
    Tibolla, O.
    Tluczykont, M.
    Valerius, K.
    van Eldik, C.
    Vasileiadis, G.
    Venter, C.
    Vialle, J. P.
    Viana, A.
    Vincent, P.
    Vivier, M.
    Voelk, H. J.
    Volpe, F.
    Vorobiov, S.
    Vorster, M.
    Wagner, S. J.
    Ward, M.
    Wierzcholska, A.
    Zacharias, M.
    Zajczyk, A.
    Zdziarski, A. A.
    Zech, A.
    Zechlin, H-S
    HESS Observations of the Globular Clusters NGC 6388 and M15 and Search for a Dark Matter Signal2011In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 735, no 1, p. 12-Article in journal (Refereed)
    Abstract [en]

    Observations of the globular clusters (GCs) NGC 6388 and M15 were carried out by the High Energy Stereoscopic System array of Cherenkov telescopes for a live time of 27.2 and 15.2 hr, respectively. No gamma-ray signal is found at the nominal target position of NGC 6388 and M15. In the primordial formation scenario, GCs are formed in a dark matter (DM) halo and DM could still be present in the baryon-dominated environment of GCs. This opens the possibility of observing a DM self-annihilation signal. The DM content of the GCs NGC 6388 and M15 is modeled taking into account the astrophysical processes that can be expected to influence the DM distribution during the evolution of the GC: the adiabatic contraction of DM by baryons, the adiabatic growth of a black hole in the DM halo, and the kinetic heating of DM by stars. Ninety-five percent confidence level exclusion limits on the DM particle velocity-weighted annihilation cross section are derived for these DM halos. In the TeV range, the limits on the velocity-weighted annihilation cross section are derived at the 10(-25) cm(3) s(-1) level and a few 10(-24) cm(3) s(-1) for NGC 6388 and M15, respectively.

  • 26. Abramowski, A.
    et al.
    Acero, F.
    Aharonian, F.
    Akhperjanian, A. G.
    Anton, G.
    Balzer, A.
    Barnacka, A.
    de Almeida, U. Barres
    Becherini, Yvonne
    Becker, J.
    Behera, B.
    Bernloehr, K.
    Birsin, E.
    Biteau, J.
    Bochow, A.
    Boisson, C.
    Bolmont, J.
    Bordas, P.
    Brucker, J.
    Brun, F.
    Brun, P.
    Bulik, T.
    Bueching, I.
    Carrigan, S.
    Casanova, S.
    Cerruti, M.
    Chadwick, P. M.
    Charbonnier, A.
    Chaves, R. C. G.
    Cheesebrough, A.
    Clapson, A. C.
    Coignet, G.
    Cologna, G.
    Conrad, J.
    Dalton, M.
    Daniel, M. K.
    Davids, I. D.
    Degrange, B.
    Deil, C.
    Dickinson, H. J.
    Djannati-Atai, A.
    Domainko, W.
    Drury, L. O 'C.
    Dubus, G.
    Dutson, K.
    Dyks, J.
    Dyrda, M.
    Egberts, K.
    Eger, P.
    Espigat, P.
    Fallon, L.
    Farnier, C.
    Fegan, S.
    Feinstein, F.
    Fernandes, M. V.
    Fiasson, A.
    Fontaine, G.
    Foerster, A.
    Fuessling, M.
    Gallant, Y. A.
    Gast, H.
    Gerard, L.
    Gerbig, D.
    Giebels, B.
    Glicenstein, J. F.
    Glueck, B.
    Goret, P.
    Goering, D.
    Haeffner, S.
    Hague, J. D.
    Hampf, D.
    Hauser, M.
    Heinz, S.
    Heinzelmann, G.
    Henri, G.
    Hermann, G.
    Hinton, J. A.
    Hoffmann, A.
    Hofmann, W.
    Hofverberg, P.
    Holler, M.
    Horns, D.
    Jacholkowska, A.
    de Jager, O. C.
    Jahn, C.
    Jamrozy, M.
    Jung, I.
    Kastendieck, M. A.
    Katarzynski, K.
    Katz, U.
    Kaufmann, S.
    Keogh, D.
    Khangulyan, D.
    Khelifi, B.
    Klochkov, D.
    Kluzniak, W.
    Kneiske, T.
    Komin, Nu
    Kosack, K.
    Kossakowski, R.
    Laffon, H.
    Lamanna, G.
    Lennarz, D.
    Lohse, T.
    Lopatin, A.
    Lu, C. -C
    Marandon, V.
    Marcowith, A.
    Masbou, J.
    Maurin, D.
    Maxted, N.
    Mayer, M.
    McComb, T. J. L.
    Medina, M. C.
    Mehault, J.
    Moderski, R.
    Moulin, E.
    Naumann, C. L.
    Naumann-Godo, M.
    de Naurois, M.
    Nedbal, D.
    Nekrassov, D.
    Nguyen, N.
    Nicholas, B.
    Niemiec, J.
    Nolan, S. J.
    Ohm, S.
    Wilhelmi, E. de Ona
    Opitz, B.
    Ostrowski, M.
    Oya, I.
    Panter, M.
    Arribas, M. Paz
    Pedaletti, G.
    Pelletier, G.
    Petrucci, P. -O
    Pita, S.
    Puehlhofer, G.
    Punch, Michael
    Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France.
    Quirrenbach, A.
    Raue, M.
    Rayner, S. M.
    Reimer, A.
    Reimer, O.
    Renaud, M.
    de los Reyes, R.
    Rieger, F.
    Ripken, J.
    Rob, L.
    Rosier-Lees, S.
    Rowell, G.
    Rudak, B.
    Rulten, C. B.
    Ruppel, J.
    Sahakian, V.
    Sanchez, D. A.
    Santangelo, A.
    Schlickeiser, R.
    Schoeck, F. M.
    Schulz, A.
    Schwanke, U.
    Schwarzburg, S.
    Schwemmer, S.
    Sheidaei, F.
    Skilton, J. L.
    Sol, H.
    Spengler, G.
    Stawarz, L.
    Steenkamp, R.
    Stegmann, C.
    Stinzing, F.
    Stycz, K.
    Sushch, I.
    Szostek, A.
    Tavernet, J. -P
    Terrier, R.
    Tluczykont, M.
    Valerius, K.
    van Eldik, C.
    Vasileiadis, G.
    Venter, C.
    Vialle, J. P.
    Viana, A.
    Vincent, P.
    Voelk, H. J.
    Volpe, F.
    Vorobiov, S.
    Vorster, M.
    Wagner, S. J.
    Ward, M.
    White, R.
    Wierzcholska, A.
    Zacharias, M.
    Zajczyk, A.
    Zdziarski, A. A.
    Zech, A.
    Zechlin, H. -S
    Search for dark matter annihilation signals from the Fornax galaxy cluster with H.E.S.S.2012In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 750, no 2, article id 123Article in journal (Refereed)
    Abstract [en]

    The Fornax galaxy cluster was observed with the High Energy Stereoscopic System for a total live time of 14.5 hr, searching for very high energy (VHE; E > 100GeV) gamma-rays from dark matter (DM) annihilation. No significant signal was found in searches for point-like and extended emissions. Using several models of the DM density distribution, upper limits on the DM velocity-weighted annihilation cross-section <sigma upsilon > as a function of the DM particle mass are derived. Constraints are derived for different DM particle models, such as those arising from Kaluza-Klein and supersymmetric models. Various annihilation final states are considered. Possible enhancements of the DM annihilation gamma-ray flux, due to DM substructures of the DM host halo, or from the Sommerfeld effect, are studied. Additional gamma-ray contributions from internal bremsstrahlung and inverse Compton radiation are also discussed. For a DM particle mass of 1 TeV, the exclusion limits at 95% of confidence level reach values of <sigma upsilon >(95% C.L.) similar to 10(-23) cm(3) s(-1), depending on the DM particle model and halo properties. Additional contribution from DM substructures can improve the upper limits on <sigma upsilon > by more than two orders of magnitude. At masses around 4.5 TeV, the enhancement by substructures and the Sommerfeld resonance effect results in a velocity-weighted annihilation cross-section upper limit at the level of <sigma upsilon >(95% C.L.) similar to 10(-26) cm(3) s(-1).

  • 27. Abramowski, A.
    et al.
    Acero, F.
    Aharonian, F.
    Akhperjanian, A. G.
    Anton, G.
    Balzer, A.
    Barnacka, A.
    de Almeida, U. Barres
    Becherini, Yvonne
    Becker, J.
    Behera, B.
    Bernloehr, K.
    Birsin, E.
    Biteau, J.
    Bochow, A.
    Boisson, C.
    Bolmont, J.
    Bordas, P.
    Brucker, J.
    Brun, F.
    Brun, P.
    Bulik, T.
    Buesching, I.
    Carrigan, S.
    Casanova, S.
    Cerruti, M.
    Chadwick, P. M.
    Charbonnier, A.
    Chaves, R. C. G.
    Cheesebrough, A.
    Clapson, A. C.
    Coignet, G.
    Cologna, G.
    Conrad, J.
    Dalton, M.
    Daniel, M. K.
    Davids, I. D.
    Degrange, B.
    Deil, C.
    Dickinson, H. J.
    Djannati-Atai, A.
    Domainko, W.
    Drury, L. O 'C.
    Dubus, G.
    Dutson, K.
    Dyks, J.
    Dyrda, M.
    Egberts, K.
    Eger, P.
    Espigat, P.
    Fallon, L.
    Farnier, C.
    Fegan, S.
    Feinstein, F.
    Fernandes, M. V.
    Fiasson, A.
    Fontaine, G.
    Foerster, A.
    Fuessling, M.
    Gallant, Y. A.
    Gast, H.
    Gerard, L.
    Gerbig, D.
    Giebels, B.
    Glicenstein, J. F.
    Glueck, B.
    Goret, P.
    Goering, D.
    Haeffner, S.
    Hague, J. D.
    Hampf, D.
    Hauser, M.
    Heinz, S.
    Heinzelmann, G.
    Henri, G.
    Hermann, G.
    Hinton, J. A.
    Hoffmann, A.
    Hofmann, W.
    Hofverberg, P.
    Holler, M.
    Horns, D.
    Jacholkowska, A.
    de Jager, O. C.
    Jahn, C.
    Jamrozy, M.
    Jung, I.
    Kastendieck, M. A.
    Katarzynski, K.
    Katz, U.
    Kaufmann, S.
    Keogh, D.
    Khangulyan, D.
    Khelifi, B.
    Klochkov, D.
    Kluzniak, W.
    Kneiske, T.
    Komin, Nu.
    Kosack, K.
    Kossakowski, R.
    Laffon, H.
    Lamanna, G.
    Lennarz, D.
    Lohse, T.
    Lopatin, A.
    Lu, C. -C
    Marandon, V.
    Marcowith, A.
    Masbou, J.
    Maurin, D.
    Maxted, N.
    Mayer, M.
    McComb, T. J. L.
    Medina, M. C.
    Mehault, J.
    Moderski, R.
    Moulin, E.
    Naumann, C. L.
    Naumann-Godo, M.
    de Naurois, M.
    Nedbal, D.
    Nekrassov, D.
    Nguyen, N.
    Nicholas, B.
    Niemiec, J.
    Nolan, S. J.
    Ohm, S.
    Wilhelmi, E. de Ona
    Opitz, B.
    Ostrowski, M.
    Oya, I.
    Panter, M.
    Arribas, M. Paz