Baryon content and dynamic state of galaxy clusters: XMM-Newton observations of A1095 and A1926

Baryon content and dynamic state of galaxy clusters: XMM-Newton observations of A1095 and A1926
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星系团的重子含量和动态:A1095 和 A1926 的 XMM-Newton 观测

DOI:
10.1093/mnras/stw599
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发表时间:
2016-03
影响因子:
4.8
通讯作者:
Ji Li
Ji Li
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Tripp Todd;Li ZHiyuan;Gu Qiusheng;Ji Li

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我们已经启动了一个研究星系团重子含量和动力学状态的计划。在这里,我们主要从两个光学选择星系团,A1095(z相似或等于0.210)和A1926(z相似或等于0.136)的XMM-牛顿观测结果。我们发现它们实际上是红移相近的团簇对。我们通过X射线光谱拟合来表征这些单个星系团的温度,然后估计它们的引力质量。我们展示了一组丰富的子结构,包括漫射X射线形心和星系团中最亮的星系之间的较大位置偏移,这表明它们在动态上很年轻。对于A1095和A1926,我们发现星系团对结合所需的质量小于总的引力质量。因此,这两个集群对似乎是正在进行的主要合并。结合斯隆数字巡天和NRAO VLA巡天/二十厘米射电天空微弱图像数据,我们进一步检查了星系团的大尺度结构环境和射电发射,以探索它们的起源,这也导致了另外两个发现A1926视野中的X射线发射星系团(z相似或等于0.097和相似或等于0.147)。我们估计了每个星团的热气和恒星质量,与预期的宇宙学重子质量分数相比,为温暖的气体留下了足够的空间。
We have initiated a program to study the baryon content and dynamic state of galaxy clusters. Here we present results primarily from XMM-Newton observations of two optically selected galaxy clusters, A1095 (z similar or equal to 0.210) and A1926 (z similar or equal to 0.136). We find that both of them are actually cluster pairs at similar redshifts. We characterize the temperatures of these individual clusters through X-ray spectral fits and then estimate their gravitational masses. We show a rich set of substructures, including large position offsets between the diffuse X-ray centroids and the brightest galaxies of the clusters, which suggests that they are dynamically young. For both A1095 and A1926, we find that the mass required for the cluster pairs to be bound is smaller than the total gravitational mass. Thus both cluster pairs appear to be ongoing major mergers. Incorporating Sloan Digital Sky Survey and NRAO VLA Sky Survey/Faint Images of the Radio Sky at Twenty-cm data, we further examine the large-scale structure environment and radio emission of the clusters to probe their origins, which also leads to the discovery of two additional X-ray-emitting clusters (z similar or equal to 0.097 and similar or equal to 0.147) in the field of A1926. We estimate the hot gas and stellar masses of each cluster, which compared with the expected cosmological baryonic mass fraction, leave ample room for warm gas.
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