PoS - Proceedings of Science
Volume 301 - 35th International Cosmic Ray Conference (ICRC2017) - Session Gamma-Ray Astronomy. GA-extra-galactic
H.E.S.S. discovery of very-high-energy emission from the blazar PKS 0736+017: on the location of the γ-ray emitting region in FSRQs
M. Cerruti*, J.P. Lenain, H. Prokoph  on behalf of the H.E.S.S. collaboration
Full text: pdf
Pre-published on: August 16, 2017
Published on: August 03, 2018
Abstract
With the installation of a new 28-m diameter imaging atmospheric Cherenkov telescope in the middle of the array, the H.E.S.S. instrument has entered since 2012 into its Phase II. The fifth large-size telescope is particularly important to lower the threshold energy of the array, and is thus a unique instrument to observe low-frequency-peaked blazars, such as flat-spectrum radio-quasars (FSRQs), which remain rare in the very-high-
energy (VHE; E $>$ 100 GeV) $\gamma$-ray domain. In this contribution, we report on the discovery with the H.E.S.S. telescopes of VHE $\gamma$-ray emission from the FSRQ PKS 0736+017 (z=0.189). H.E.S.S. observations were triggered as a target-of-opportunity in February 2015 following the detection of $\gamma$-ray flaring activity in the MeV-GeV energy-band with Fermi-LAT. Significant VHE emission is detected with H.E.S.S. only during one of the nights of the observing campaign, showing at least night-by-night variability in the VHE regime. We discuss the location of the $\gamma$-ray emitting region within the relativistic jet, using opacity and variability constraints.
DOI: https://doi.org/10.22323/1.301.0627
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.