FSRQ and the Gamma-Ray Background

Abstract

The contribution of Flat Spectrum Radio Quasars (FSRQ) to the γ-ray background (GRB) is modeled. FSRQ are known to make a substantial contribution to the hard (E>100 MeV) background. The so called “MeV bump”, however, cannot be accounted for in terms of this class of sources even taking into account the newly discovered class of FSRQ with a broad band spectrum sharply peaked in the MeV range (“MeV blazars”). This is in agreement with the recent results obtained by Kappadath et al. (1995) using COMPTEL data.