12-16 September 2016
Europe/Zurich timezone
There is a live webcast for this event.

Gamma-ray blazars at the dawn of the Universe

12 Sep 2016, 17:00
500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium


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Oral Contributions Gamma-ray astrophysics Gamma-ray astrophysics


Vaidehi Paliya (Clemson University)


A broadband study of high-z (z>3) blazars enables us to understand the evolution of the properties of relativistic jets over cosmic time. Moreover, it has been found in many studies that such high-z blazars host extremely massive black holes (M$_{BH}$> 1e9 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. They are found to host extremely massive black holes at their centers, as confirmed from both IR-UV continuum modeling 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.

Primary author

Vaidehi Paliya (Clemson University)

Presentation Materials