Back to Search
Start Over
Very high energy $��$-ray emission from two blazars of unknown redshift and upper limits on their distance
- Publication Year :
- 2020
- Publisher :
- arXiv, 2020.
-
Abstract
- We report on the detection of very-high-energy (VHE; $E > 100$ GeV) $��$-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 multi-wavelength observations with Fermi/LAT, XRT and UVOT on board the Swift satellite, and ATOM. Based on an extrapolation of the Fermi/LAT spectrum towards the VHE $��$-ray regime, we deduce a 95% 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 $0.51 \leq z < 0.98$ and for PKS 1440-389 to $0.14 \lessapprox z < 0.53$.<br />Accepted for publication in MNRAS. 13 pages, 4 figures
- Subjects :
- High Energy Astrophysical Phenomena (astro-ph.HE)
FOS: Physical sciences
Subjects
Details
- ISSN :
- 03111938
- Database :
- OpenAIRE
- Accession number :
- edsair.doi...........269c96f79d3111cf331866f50d5c6f82
- Full Text :
- https://doi.org/10.48550/arxiv.2004.03306