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2003ApJ...588..155R - Astrophys. J., 588, 155-164 (2003/May-1)

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


Abstract (from CDS):

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 co-added image from individual galaxy clusters has been analyzed using an adequately adapted diffuse gamma-ray foreground model. The resulting upper 2 σ limit for the average cluster is ∼6x10–9 cm–2 s–1 for E>100 MeV. Implications of the nondetection 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.

Abstract Copyright:

Journal keyword(s): Galaxies: Clusters: General - Gamma Rays: Observations - X-Rays: Galaxies: Clusters

Simbad objects: 67

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