Gamma-ray Beacons at the Dawn of the Universe
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Gasparrini, D.; Paliya, V.S.; Ajello, M.; Ojha, R.; Fermi-LAT Collaboration; Gamma-ray Beacons at the Dawn of the Universe; 35th International Cosmic Ray Conference — ICRC2017; https://pos.sissa.it/301/659
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This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
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Abstract
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 (MBH > 109M ) 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