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FSRQ and the Gamma-Ray Background

Published online by Cambridge University Press:  25 May 2016

T. Di Girolamo ,
A. Comastri  and
G. Setti
T. Di Girolamo
Affiliation:
Istituto di Radioastronomia del CNR Via Gobetti 101, I–40129 Bologna, Italy
A. Comastri
Affiliation:
Istituto di Radioastronomia del CNR Via Gobetti 101, I–40129 Bologna, Italy
G. Setti
Affiliation:
Istituto di Radioastronomia del CNR Via Gobetti 101, I–40129 Bologna, Italy

Extract

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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.

Type
Cosmological Implications
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 595 - 596
Copyright
Copyright © Kluwer 1996 

References

Comastri, A., Setti, G., Zamorani, G., Hasinger, G., 1995, A&A , 296, 1 Google Scholar
Kappadath, S.C., et al., 1995, in Proceedings of the 3rd COMPTON Symposium , München, June 1995, in press Google Scholar
Thompson, D.J., et al., 1995, ApJS , in press Google Scholar