EGRET Upper Limits on the High-Energy Gamma-Ray Emission of Galaxy Clusters
EGRET Upper Limits on the High-Energy Gamma-Ray Emission of Galaxy Clusters
复制标题
EGRET 星系团高能伽马射线发射上限
DOI：
10.1086/374046
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
J. Mattox
中科院分区：
文献类型：
--
作者：
O. Reimer;M. Pohl;P. Sreekumar;J. Mattox
我们报告EGRET上限的高能量伽马射线发射的星系团。1991年至2000年期间的EGRET观测分析了来自附近X射线明亮星系团的通量有限样本的58个单独星系团的位置。随后，一个共同添加的图像，从个别星系团已被分析使用充分适应的漫射伽玛射线前景模型。当E > 100 MeV时，平均团簇的2 σ上限约为6 × 10-9 cm-2 s-1。未检测到突出的个别集群和一般无法检测的X射线最亮的星系团作为一类的伽马射线发射器的影响进行了讨论。我们比较我们的结果与模型预测的高能量伽马射线发射的星系团，以及与最近的索赔之间的关联身份不明或未解决的伽马射线源和阿贝尔星系团，发现这些矛盾。
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 ~6 × 10-9 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.