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Type: Journal article
Title: Very high energy γ-ray emission from two blazars of unknown redshift and upper limits on their distance
Other Titles: Very high energy gamma-ray emission from two blazars of unknown redshift and upper limits on their distance
Author: Abdalla, H.
Adam, R.
Aharonian, F.
Benkhali, F.A.
Anguner, E.O.
Arakawa, M.
Arcaro, C.
Armand, C.
Armstrong, T.
Ashkar, H.
Backes, M.
Baghmanyan, V.
Martins, V.B.
Barnacka, A.
Barnard, M.
Becherini, Y.
Berge, D.
Bernloehr, K.
Bottcher, M.
Boisson, C.
et al.
Citation: Monthly Notices of the Royal Astronomical Society, 2020; 494(4):5590-5602
Publisher: Oxford University Press
Issue Date: 2020
ISSN: 0035-8711
Statement of
H. Abdalla … P. deWilt … K. Feijen … G. Rowell … et al. (H.E.S.S. Collaboration)
Abstract: We report on the detection of very high energy (VHE; E > 100 GeV) γ-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 γ-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.
Keywords: BL Lacertae objects: individual; galaxies: high-redshift; gamma-rays: general; resolved and unresolved sources as a function of wavelength
Rights: © 2020 The Author(s). Published by Oxford University Press on behalf of The Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
DOI: 10.1093/mnras/staa999
Grant ID: ARC
Appears in Collections:Aurora harvest 8
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