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1996•The Astrophysical JournalOpen access

The Gamma-Ray Background from Blazars: A New Look

F. W. Stecker, M. H. Salamon

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Abstract

We present the results of a new model calculation of the γ-ray background produced by unresolved blazars, using the second EGRET catalog and taking account of flaring. These results are compared to the preliminary γ-ray background spectrum reported recently by the EGRET team. We find that blazars can account for the entire extragalactic γ-ray background observed by EGRET. In addition, the EGRET spectrum shows some evidence of a signature for the blazar background, a concavity in the spectrum first pointed out in our earlier paper.

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What this paper is about

We present the results of a new model calculation of the γ-ray background produced by unresolved blazars, using the second EGRET catalog and taking account of flaring. These results are compared to the preliminary γ-ray background spectrum reported recently by the EGRET team. We find that blazars can account for the entire extragalactic γ-ray background observed by EGRET. In addition, the EGRET spectrum shows some evidence of a signature for the blazar background, a concavity in the spectrum first pointed out in our earlier paper.

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Available abstract

We present the results of a new model calculation of the γ-ray background produced by unresolved blazars, using the second EGRET catalog and taking account of flaring. These results are compared to the preliminary γ-ray background spectrum reported recently by the EGRET team. We find that blazars can account for the entire extragalactic γ-ray background observed by EGRET. In addition, the EGRET spectrum shows some evidence of a signature for the blazar background, a concavity in the spectrum first pointed out in our earlier paper.

Key concepts: Egret, Blazar, Physics, Astrophysics, Quasar, Gamma ray, Background radiation, Galaxy

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