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EGRET upper limits on the high-energy gamma-ray emission of galaxy clusters

O. Reimer·M. Pohl·P. Sreekumar·J. R. Mattox
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Abstract

We report EGRET upper limits on the high-energy gamma-ray emission from clusters of galaxies. EGRET observations between 1991 and 2000 were analyzed at positions of 58 individual clusters from a flux-limited sample of nearby X-ray bright galaxy clusters. Subsequently, a coadded image from individual galaxy clusters has been analyzed using an adequately adapted diffuse gamma-ray foreground model. The resulting 2 sigma upper limit for the average cluster is \~ 6 x 10^{-9} cm^{-2} s^{-1} for E > 100 MeV. Implications of the non--detection of prominent individual clusters and of the general inability to detect the X-ray brightest galaxy clusters as a class of gamma-ray emitters are discussed. We compare our results with model predictions on the high-energy gamma-ray emission from galaxy clusters as well as with recent claims of an association between unidentified or unresolved gamma-ray sources and Abell clusters of galaxies and find these contradictory.

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O. Reimer, M. Pohl, P. Sreekumar, J. R. Mattox. 2003-01-17. EGRET upper limits on the high-energy gamma-ray emission of galaxy clusters. https://doi.org/10.1086/374046

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