Very high energy $\gamma$-ray emission from two blazars of unknown redshift and upper limits on their distance
GIUNTI, L.
AstroParticule et Cosmologie [APC (UMR_7164)]
Institut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
< Reduce
AstroParticule et Cosmologie [APC (UMR_7164)]
Institut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
Language
en
Article de revue
This item was published in
Mon.Not.Roy.Astron.Soc.. 2020, vol. 494, n° 4, p. 5590-5602
English 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 ...Read more >
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.Read less <
English Keywords
BL Lacertae objects: individual
galaxies: high-redshift
gamma-rays: general
Resolved and unresolved sources as a function of wavelength
energy: high
gamma ray: VHE
redshift
HESS
5/3
GLAST
satellite
blazar
Origin
Hal imported