12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room C(108)

[GA053] Gamma-ray Beacons at the Dawn of the Universe

Speakers

  • Dario GASPARRINI

Primary authors

  • Dario GASPARRINI (ASI Science Data Center and INFN, Sezione di Perugia, Italy)

Co-authors

Description

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_BH> 1e9 M_sun) 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.