Can Flat Spectrum Radio Quasars make most of the overall gamma--ray background ?

Details Can Flat Spectrum Radio Quasars make most of the overall gamma--ray background ? Can Flat Spectrum Radio Quasars make most of the overall gamma--ray background ?

1996-07-10

arxiv.org/abs/astro-ph/9607050v1

Astronomy and Astrophysics

Astrophysics

4 pages, AA LaTeX, plus 3 .ps figures and style file l-aa.sty, uuencoded, gzip tar file, to appear in Astronomy and Astrophysi

Scientific paper

The contribution of discrete sources to the gamma--ray background is modeled. Flat spectrum radio quasars 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 known classes of sources even taking into account the newly discovered class of objects with a broad band spectrum sharply peaked in the MeV range (``MeV blazars"). Even in the most optimistic case the predicted intensity falls short of at least a factor three.

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