Very high energy gamma-ray emission from two blazars of unknown redshift and upper limits on their distance

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
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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