Very high energy γ-ray emission from two blazars of unknown redshift and upper limits on their distance
- 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.
| Author details: | Hassan E. AbdallaORCiDGND, Remi Adam, Felix A. AharonianORCiDGND, Faical Ait BenkhaliORCiDGND, Ekrem Oǧuzhan AngünerGND, Masanori ArakawaORCiD, C Arcaro, Catherine Armand, T. Armstrong, Kathrin EgbertsGND |
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| Title of parent work (English): | Monthly Notices of the Royal Astronomical Society |
| Publisher: | Wiley-Blackwell |
| Place of publishing: | Oxford |
| Publication type: | Article |
| Language: | English |
| Date of first publication: | 2020/02/27 |
| Publication year: | 2020 |
| Release date: | 2021/11/15 |
| Tag: | BL Lacertae objects: individual; Resolved and unresolved sources as a function of wavelength; galaxies: high-redshift; gamma-rays: general |
| Volume: | 494 |
| Issue: | 4 |
| Number of pages: | 13 |
| Funding institution: | Universität Potsdam |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Peer review: | Referiert |
| Publishing method: | Open Access / Gold Open-Access |
| License (German): |  CC-BY - Namensnennung 4.0 International |
| External remark: | Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe ; 1202 |
