Curvature in the very-high energy gamma-ray spectrum of M 87

Aharonian, F.; Benkhali, F. Ait; Aschersleben, J.; Ashkar, H.; Backes, M.; Martins, V. Barbosa; Batzofin, R.; Becherini, Yvonne; Berge, D.; Bernlohr, K.; Bottcher, M.; Boisson, C.; Bolmont, J.; de lavergne, M. de Bony; Bradascio, F.; Brose, R.; Brun, F.; Bruno, B.; Bulik, T.; Burger-Scheidlin, C.; Bylund, T.; Casanova, S.; Cecil, R.; Celic, J.; Cerruti, M.; Chand, T.; Chandra, S.; Chen, A.; Chibueze, J.; Chibueze, O.; Collins, T.; Cotter, G.; Mbarubucyeye, J. Damascene; Djannati-Atai, A.; Djuvsland, J.; Dmytriiev, A.; Egberts, K.; Einecke, S.; Fegan, S.; Fontaine, G.; Funk, S.; Gabici, S.; Glicenstein, J. F.; Glombitza, J.; Grolleron, G.; Haerer, L.; Hofmann, W.; Holch, T. L.; Holler, M.; Horns, D.; Jamrozy, M.; Jankowsky, F.; Joshi, V.; Jung-Richardt, I.; Kasai, E.; Katarzynski, K.; Khatoon, R.; Khelifi, B.; Kluzniak, W.; Komin, Nu.; Kosack, K.; Kostunin, D.; Kundu, A.; Lang, R. G.; Le Stum, S.; Leitl, F.; Lemiere, A.; Lemoine-Goumard, M.; Lenain, J. -P; Lypova, I.; Luashvili, A.; Mackey, J.; Malyshev, D.; Marti-Devesa, G.; Marx, R.; Mehta, A.; Meyer, M.; Mitchell, A.; Moderski, R.; Moghadam, M. O.; Mohrmann, L.; Montanari, A.; Moulin, E.; Murach, T.; de Naurois, M.; Niemiec, J.; Ohm, S.; Olivera-Nieto, L.; Wilhelmi, E. de Ona; Panny, S.; Panter, M.; Parsons, R. D.; Pensec, U.; Pita, S.; Puhlhofer, G.; Punch, M.; Quirrenbach, A.; Regeard, M.; Reimer, A.; Reimer, O.; Ren, H.; Reville, B.; Rieger, F.; Rudak, B.; Ruiz-Velasco, E.; Sahakian, V.; Salzmann, H.; Santangelo, A.; Sasaki, M.; Schussler, F.; Schutte, H. M.; Shapopi, J. N. S.; Sol, H.; Spencer, S.; Stawarz, L.; Steenkamp, R.; Steinmassl, S.; Steppa, C.; Streil, K.; Takahashi, T.; Tanaka, T.; Taylor, A. M.; Terrier, R.; Tsirou, M.; van Eldik, C.; Venter, C.; Vink, J.; Wach, T.; Wagner, S. J.; Wierzcholska, A.; Zacharias, M.; Zdziarski, A. A.; Zech, A.; Zilberman, P.; Zywucka, N.

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Curvature in the very-high energy gamma-ray spectrum of M 87

Aharonian, F.

Dublin Inst Adv Studies, Ireland;Max Planck Inst Kernphys, Germany;Yerevan State Univ, Armenia.

Benkhali, F. Ait

Heidelberg Univ, Germany.

Aschersleben, J.

Univ Groningen, Netherlands.

Ashkar, H.

CNRS, France.

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2024 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 685, article id A96Article in journal (Refereed) Published

Abstract [en]

The radio galaxy M 87 is a variable very-high energy (VHE) gamma-ray source, exhibiting three major flares, which were reported in 2005, 2008, and 2010. Despite extensive studies, the origin of the VHE gamma-ray emission is not yet fully understood. In this study, we investigate the VHE gamma-ray spectrum of M 87 during states of high gamma-ray activity, utilizing 20.2 h of H.E.S.S. observations. Our findings indicate a preference for a curved spectrum, characterized by a log-parabola model with extra-galactic background light (EBL) model above 0.3 TeV at the 4σ level, compared to a power-law spectrum with EBL. We investigate the degeneracy between the absorption feature and the EBL normalization and derive upper limits on EBL models that are mainly sensitive in the wavelength range of 12.4 μm–40 μm.

Place, publisher, year, edition, pages

EDP Sciences, 2024. Vol. 685, article id A96

Keywords [en]

astroparticle physics, galaxies: active, galaxies: jets, gamma rays: galaxies, infrared: general

National Category

Astronomy, Astrophysics and Cosmology

Research subject

Physics, Astroparticle Physics

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URN: urn:nbn:se:lnu:diva-133061DOI: 10.1051/0004-6361/202348913ISI: 001279369300001Scopus ID: 2-s2.0-85193454856OAI: oai:DiVA.org:lnu-133061DiVA, id: diva2:1908734

Available from: 2024-10-28 Created: 2024-10-28 Last updated: 2024-11-21Bibliographically approved

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Becherini, Yvonne

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