PoS - Proceedings of Science
Volume 301 - 35th International Cosmic Ray Conference (ICRC2017) - Session Gamma-Ray Astronomy. GA-extra-galactic
Gamma-ray Beacons at the Dawn of the Universe
D. Gasparrini*, V.S. Paliya", M. Ajello", R. Ojha"  on behalf of the Fermi-LAT Collaboration
Full text: pdf
Pre-published on: August 16, 2017
Published on: August 03, 2018
Gamma ray detected high-redshift blazars (z>3) are intrinsically interesting since they inform us about the evolution of gamma-ray blazars and are, by definition, some of the more luminous blazars in the Universe. It has been found in many studies that such high z blazars host extremely massive black holes ($M_{\rm BH}> 10^{9} {M_{\odot}}$) and thus shed a new light on the formation of supermassive black holes in the early Universe. Here we report the first detection of gamma-ray emitting blazars beyond z=3.1 using the sensitive Pass 8 dataset of Fermi-LAT. These objects are found to host extremely massive black holes at their centers, as confirmed from both IR-UV continuum modelling with a standard accretion disk and also with the emission line measurements using optical spectroscopy. Further details of the results will be presented within the framework of the disk-jet connection in powerful jetted AGNs.
DOI: https://doi.org/10.22323/1.301.0659
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