The extragalactic gamma ray background

Details The extragalactic gamma ray background The extragalactic gamma ray background

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..558..479p&link_type=abstract

HIGH ENERGY GAMMA-RAY ASTRONOMY: International Symposium. AIP Conference Proceedings, Volume 558, pp. 479-490 (2001).

Astronomy and Astrophysics

Astronomy

Background Radiations

Scientific paper

New measurements of the extragalactic diffuse γ-ray background show that its spectrum above 30 MeV can be well described by a power law with photon index α=2.1. In the 2-10 MeV range a preliminary analysis of COMPTEL data indicates a lower intensity than previously found, with no evidence for an MeV bump. Most of the models of a truly diffuse background seem to be in conflict with the observed spectrum. Though AGN are the most likely input from discrete sources, two independent attempts to model the high energy background as the superposition of unresolved AGN indicate that AGN underproduce the observed intensity. Therefore the origin of the extragalactic γ-ray background is still unknown. .

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