H.E.S.S. Collaboration, H.E.S.S. and Aharonian, Felix and Mackey, Jonathan and Zargaryan, Davit (2020) Very high energy gamma-ray emission from two blazars of unknown redshift and upper limits on their distance. Monthly Notices of the Royal Astronomical Society, 494. p. 5590. ISSN 1365-2966
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Abstract
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 <= z < 0.53.
Item Type: | Article |
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Uncontrolled Keywords: | BL Lacertae objects: individual galaxies: high-redshift gamma-rays: general Astrophysics - High Energy Astrophysical Phenomena |
Divisions: | School of Cosmics Physics > Astronomy and Astrophysics |
Date Deposited: | 17 Jul 2020 11:40 |
Last Modified: | 17 Dec 2022 16:34 |
URI: | https://dair.dias.ie/id/eprint/1099 |
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