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

被引：162

作者：

Reimer, O ^{[1
]}

Pohl, M

Sreekumar, P

Mattox, JR

机构：

[1] Ruhr Univ Bochum, D-44780 Bochum, Germany

[2] Indian Space Res Org, Satellite Ctr, Bangalore 562140, Karnataka, India

[3] Francis Marion Univ, Dept Phys & Astron, Florence, SC 29501 USA

来源：

ASTROPHYSICAL JOURNAL | 2003年 / 588卷 / 01期

关键词：

galaxies : clusters : general; gamma rays : observations; X-rays : galaxies : clusters;

D O I：

10.1086/374046

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 sigma limit for the average cluster is similar to6 x 10(-9) cm(-1) 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.

引用

页码：155 / 164

页数：10

共 69 条

[21] The ROSAT Brightest Cluster Sample -: I.: The compilation of the sample and the cluster log N log S distribution [J].