The Cosmic Downsizing Of The Fermi's Fsrqs And The Origin Of The Isotropic Gamma-ray Background

Details The Cosmic Downsizing Of The Fermi's Fsrqs And The Origin Of The Isotropic Gamma-ray Background The Cosmic Downsizing Of The Fermi's Fsrqs And The Origin Of The Isotropic Gamma-ray Background

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.0404a&link_type=abstract

American Astronomical Society, HEAD meeting #12, #4.04

Mathematics

Logic

Scientific paper

Fermi-LAT, with its unprecedented sensitivity, has detected over a thousand point-like sources most of which are blazars detected over a wide range in redshift and luminosity. We will review the properties of the source populations detected by Fermi-LAT focusing in particular on the statistical properties of blazars. New results on the cosmological evolution and growth of FSRQs will be presented. Fermi data provide the first indications for the anti-hierarchical growth of FSRQs where more luminous objects form earlier in the history of the Universe while the less luminous, and bulk of the population, are more abundant at later epochs. At the far end of the spectrum and only 2 Gyr from the Big Bang lie the FSRQs detected by Swift, among the most powerful objects ever observed. Powered by super-massive black holes with masses often in excess of 10 billion solar masses these objects pose a question on the mechanisms of formation of massive black holes in the high redshift Universe. The Fermi and Swift data bring new insights on the blazar sequence and on the properties of FSRQs. Finally our current effort and future plans to understand and constrain the origin of Isotropic Diffuse Gamma-ray Background will be reviewed.

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