The X-ray properties of weak-lensing-selected galaxy clusters
The X-ray properties of weak-lensing-selected galaxy clusters
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DOI：
10.1093/mnras/stu2679
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发表时间：
2014-02
影响因子：
4.8
通讯作者：
P. Giles;B. Maughan;T. Hamana;S. Miyazaki;M. Birkinshaw;R. Ellis;R. Massey
中科院分区：
文献类型：
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作者：
P. Giles;B. Maughan;T. Hamana;S. Miyazaki;M. Birkinshaw;R. Ellis;R. Massey
我们展示了针对 Subaru WL 巡天中选定的 10 个弱透镜 (WL) 星系团的 X 射线后续活动的结果。其中两个星团存在钱德拉档案数据，我们获得了其余八个星团的专门观测数据。 WL 星团似乎与 X 射线选择星团一样符合 X 射线光度和温度之间相同的比例关系。然而，当我们考虑光度-质量关系时，与基于 X 射线质量估计的 X 射线选择星团相比，WL 选择星团的发光度低了 2.1 ± 0.5 倍（或者质量大了 1.7 ± 0.3）。通过考虑质心偏移、爱丁顿偏差和三轴度的影响，可以协调这种差异。我们使用 X 射线成像数据来量化星团的动态状态，发现其中一个星团出现动态松弛，其中两个星团拥有一个冷核心，与 Sunyaev-Zel'dovich 效应选择的星团一致。该比例远低于 X 射线选择的簇样本中观察到的比例。
We present the results of an X-ray follow-up campaign targeting 10 weak-lensing (WL)-selected galaxy clusters from a Subaru WL survey. Archival Chandra data exist for two of the clusters, and we obtain dedicated observations of the remaining eight. The WL clusters appear to fit the same scaling relation between X-ray luminosity and temperature as X-ray-selected clusters. However, when we consider the luminosity–mass relation, the WL-selected clusters appear underluminous by a factor 2.1 ± 0.5 (or, alternatively, more massive by 1.7 ± 0.3), compared to X-ray-selected clusters with X-ray-based mass estimates. By considering the effects of the centroid offset, Eddington bias, and triaxiallity, this difference can be reconciled. We use X-ray imaging data to quantify the dynamical state of the clusters and found that one of the clusters appears dynamically relaxed, and two of the clusters host a cool core, consistent with Sunyaev–Zel'dovich-effect-selected clusters. This fraction is much lower than observed in X-ray-selected cluster samples.