Superluminal blazars and the extragalactic gamma ray background.

Details Superluminal blazars and the extragalactic gamma ray background. Superluminal blazars and the extragalactic gamma ray background.

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jphg...23..857x&link_type=abstract

Journal of Physics G, Vol. 23, No. 7, p. 857 - 863

Physics

Blazars: Gamma-Ray Background, Blazars: Superluminal Motions, Blazars: Jets

Scientific paper

The detection of a few dozen extragalactic gamma ray blazars of extremely high luminosity by the EGRET instrument on board the Compton Gamma Ray Observatory appears to suggest that blazars make the overwhelming contribution to the cosmic gamma ray background in the energy range 100 MeV - 10 GeV. The authors point out that the superluminal effect which boosts and beams the gamma ray emission in the jets of blazars will flatten the source count in the low flux part. Consequently, the unresolved blazars would not be expected to make much contribution to the gamma ray background. From their direct modelling of the source count, they conclude that the contribution of the unresolved blazars to the gamma ray background is only 10% of the latest estimate of the EGRET data. The implication for the cosmological evolution of the blazars is discussed.

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