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

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dc.creatorReimer, O.
dc.creatorPohl, M.
dc.creatorSreekumar, P.
dc.creatorMattox, J. R.
dc.date2003-01-17
dc.date.accessioned2026-07-07T10:47:34Z
dc.date.available2026-07-07T10:47:34Z
dc.descriptionWe 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.
dc.description13 pages, 6 figures, 2 tables (emulateapj), accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0301362
dc.identifierhttp://arxiv.org/abs/astro-ph/0301362
dc.identifierAstrophys.J.588:155-164,2003
dc.identifierdoi:10.1086/374046
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/183576
dc.subjectAstrophysics
dc.titleEGRET upper limits on the high-energy gamma-ray emission of galaxy clusters
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