The lensing efficiencies of MACS X-ray-selected versus RCS optically selected galaxy clusters

The lensing efficiencies of MACS X-ray-selected versus RCS optically selected galaxy clusters
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MACS X 射线选择星系团与 RCS 光学选择星系团的透镜效率

DOI:
10.1111/j.1365-2966.2010.16763.x
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发表时间:
2010
影响因子:
4.8
通讯作者:
Bartelmann
Bartelmann
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Horesh;Ebeling;Seidel;Bartelmann

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星系团样本中强透镜弧的统计数据提供了关于星系团结构的信息,这些信息与单个星系团的信息是互补的。然而,迄今为止分析过的星团样本要么很小,要么不均匀,要么观察到的角分辨率有限。我们测量了97个星团的透镜弧统计数据,这些星团用哈勃太空望远镜以高角分辨率成像,用两种自动弧检测算法识别透镜弧。该样本包括类似数量的X射线选择的[大规模集群巡天(MACS)]和光学选择的[红序列集群巡天(RCS)]集群,并跨越集群红移范围为0.2 <z< 1。我们编制了一个目录中的42弧的X射线选择的子样本和7弧的光学子样本。除五条弧线外,所有这些弧线都是首次报道。在0.3 ≤z≤ 0.7时,X射线选择的簇具有显著更高的平均弧频率,每个簇1.2 ± 0.2,而光学样品中为0.2 ± 0.1。显著不同的透镜效率表明,尽管X射线和光学团簇的光学光度相似,但X射线团簇追踪的质量浓度要大得多。质量差异也得到了X射线团的低空间密度和光学样品中几个弧的小爱因斯坦半径的支持。更高层次的影响,如浓度或子结构的差异,也可能有所贡献。
The statistics of strongly lensed arcs in samples of galaxy clusters provide information on cluster structure that is complementary to that from individual clusters. However, samples of clusters that have been analysed to date have been either small, heterogeneous or observed with limited angular resolution. We measure the lensed-arc statistics of 97 clusters imaged at high angular resolution with theHubble Space Telescope, identifying lensed arcs using two automated arc-detection algorithms. The sample includes similar numbers of X-ray-selected [MAssive Cluster Survey (MACS)] and optically selected [Red-Sequence Cluster Survey (RCS)] clusters, and spans cluster redshifts in the range 0.2 <z< 1. We compile a catalogue of 42 arcs in the X-ray-selected subsample and seven arcs in the optical subsample. All but five of these arcs are reported here for the first time. At 0.3 ≤z≤ 0.7, the X-ray-selected clusters have a significantly higher mean frequency of arcs, 1.2 ± 0.2 per cluster, versus 0.2 ± 0.1 in the optical sample. The strikingly different lensing efficiencies indicate that X-ray clusters trace much larger mass concentrations, despite the similar optical luminosities of the X-ray and optical clusters. The mass difference is supported also by the lower space density of the X-ray clusters and by the small Einstein radii of the few arcs in the optical sample. Higher order effects, such as differences in concentration or substructure, may also contribute.
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