Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21930501a&link_type=abstract
American Astronomical Society, AAS Meeting #219, #305.01
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, that form the bulk of the population, are more abundant at later epochs. The number density of FSRQs grows dramatically up to redshift 0.5--2.0 and declines thereafter. The LF of γ-ray FSRQs follows a luminosity dependent density evolution similarly to that of AGN, but with more dramatic growth and decline rates. We find that unresolved FSRQs produce only 10% of the isotropic gamma-ray background. Finally we find that FSRQs have an average bulk Lorentz factor of Γ = 12 that most are seen within 5 degrees of the jet axis, and that they represent only 0.1 % of the parent population.
Ajello Marco
Costamante Luigi
Dermer Charles
Fermi LAT Collaboration
Romani Roger W.
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