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Flat Spectrum Radio Quasar Evolution and the Gamma-ray Background

Published online by Cambridge University Press:  25 July 2014

Jack Singal ,
Allan Ko  and
Vahe Petrosian
Jack Singal
Affiliation:
University of Richmond, Physics Department, 28 Westhampton Way, Richmond, VA 23173 email: jsingal@richmond.edu
Allan Ko
Affiliation:
Department of Physics, Masacusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307
Vahe Petrosian
Affiliation:
Kavli Institute for Particle Astrophysics and Cosmology, Departments of Physics and Applied Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305-4060
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Abstract

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We discuss an analysis of the redshift evolutions and distributions of the gamma-ray luminosity and photon spectral index of flat spectrum radio quasar (FSRQ) type blazars. We utilize data from the Fermi Gamma-ray Space Telescope, with redshfits as determined from optical spectroscopy by Shaw et al. We find that FSRQs have evolved significantly in luminosity but negligibly in photon index, and contribute in toto roughly 20% of the total gamma-ray output of the Universe.

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