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arXiv 1009.4699astro-ph.CO
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Swift/BAT时代的星系团II:在15个以上探测到10个星系团keV

Galaxy Clusters in the Swift/BAT era II: 10 more Clusters detected above 15 keV

M. Ajello, P. Rebusco, N. Cappelluti, O. Reimer, H. Boehringer, V. La Parola, G. Cusumano

摘要:

我们报告的发现,另外10个星系团检测到正在进行的雨燕/BAT全天空调查。新发现的星团包括:Bullet、Abell 85、Norma和PKS 0745-19。Norma是这里介绍的集群中唯一一个由BAT解决的集群。对于所有的集群,我们使用XMM-牛顿和斯威夫特/BAT数据进行详细的光谱分析,以调查硬(非热)X射线过剩的存在。我们发现在大多数情况下,团簇在0.3- 200 keV波段的发射可以用多温热模型来解释,证实了我们以前的结果。对于两个集群(子弹和阿贝尔3667),我们发现的硬X射线过剩的存在的证据。在子弹集群的情况下,我们的分析证实了存在一个非热,幂律一样,组件与20-100千电子伏通量为3.4 \times 10-12 erg cm-2 s-1的检测在以前的研究。对于Abell 3667,过量发射可以成功地建模为热分量(kT=~ 13 keV)。因此,我们认为星系团(子弹星系团除外)的硬X射线辐射很可能是热辐射。

英文摘要:

We report on the discovery of 10 additional galaxy clusters detected in the ongoing Swift/BAT all-sky survey. Among the newly BAT-discovered clusters there are: Bullet, Abell 85, Norma, and PKS 0745-19. Norma is the only cluster, among those presented here, which is resolved by BAT. For all the clusters we perform a detailed spectral analysis using XMM-Newton and Swift/BAT data to investigate the presence of a hard (non-thermal) X-ray excess. We find that in most cases the clusters' emission in the 0.3-200keV band can be explained by a multi-temperature thermal model confirming our previous results. For two clusters (Bullet and Abell 3667) we find evidence for the presence of a hard X-ray excess. In the case of the Bullet cluster, our analysis confirms the presence of a non-thermal, power-law like, component with a 20-100 keV flux of 3.4 \times 10-12 erg cm-2 s-1 as detected in previous studies. For Abell 3667 the excess emission can be successfully modeled as a hot component (kT=~13keV). We thus conclude that the hard X-ray emission from galaxy clusters (except the Bullet) has most likely thermal origin.

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