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Very high energy gamma-ray emission from two blazars of unknown redshift and upper limits on their distance
North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa..
Ecole Polytech, CNRS, Inst Polytech Paris, Lab Leprince Ringuet, F-91128 Palaiseau, France..
Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany.;Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland.;RAU, High Energy Astrophys Lab, 123 Hovsep Enmin St, Yerevan 0051, Armenia..
Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany..
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2020 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 494, no 4, p. 5590-5602Article in journal (Refereed) Published
Abstract [en]

We report on the detection of very high energy (VHE; E > 100 GeV) gamma-ray emission from the BL Lac objects KUV 00311-1938 and PKS 1440-389 with the High Energy Stereoscopic System (H.E.S.S.). H.E.S.S. observations were accompanied or preceded by multiwavelength observations with Fermi/LAT, XRT and UVOT onboard the Swift satellite, and ATOM. Based on an extrapolation of the Fermi/LAT spectrum towards the VHE gamma-ray regime, we deduce a 95 per cent confidence level upper limit on the unknown redshift of KUV 00311-1938 of z < 0.98 and of PKS 1440-389 of z < 0.53. When combined with previous spectroscopy results, the redshift of KUV 00311-1938 is constrained to 0.51 <= z < 0.98 and of PKS 1440-389 to 0.14 (sic) z < 0.53.

Place, publisher, year, edition, pages
Oxford University Press, 2020. Vol. 494, no 4, p. 5590-5602
Keywords [en]
BL Lacertae objects: individual, galaxies: high-redshift, gamma-rays: general, Resolved and unresolved sources as a function of wavelength
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-97159DOI: 10.1093/mnras/staa999ISI: 000539097800075Scopus ID: 2-s2.0-85097002185OAI: oai:DiVA.org:lnu-97159DiVA, id: diva2:1454049
Available from: 2020-07-14 Created: 2020-07-14 Last updated: 2023-01-30Bibliographically approved

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Becherini, YvonneBylund, TomasPunch, MichaelSenniappan, Mohanraj

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Becherini, YvonneBylund, TomasPunch, MichaelSenniappan, Mohanraj
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Department of Physics and Electrical Engineering
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Monthly notices of the Royal Astronomical Society
Astronomy, Astrophysics and Cosmology

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