XXL调查：XVI。z~0.3的X射线选择星系团成团
The XXL Survey: XVI. The clustering of X-ray selected galaxy clusters at z~0.3
摘要：
星系团是宇宙大尺度结构中密度最高的峰。它们的聚类提供了一个强大的探测器，可以与星系团质量测量结合使用，以加强星系团数量计数所提供的宇宙学约束。我们调查的X射线选择星系团从XXL调查，最大的计划进行的XMM-牛顿卫星的均匀样本的空间特性。的测量进行比较，$Λ$ -冷暗物质的预测，并结合使用自校准的质量缩放关系，以约束样品，$b_{eff}$的有效偏差，和物质密度对比度，$Ω_{\rm M}$。我们测量了XXL集群样本的角度平均两点相关函数。分析的目录包括从XXL第二次数据发布中选择的$182$ X射线簇，具有中值红移$\langle z \rangle=0.317$和中值质量$\langle M_{500} \rangle\simeq1.3\cdot10^{14} M_\odot$。马尔可夫链蒙特卡罗分析进行提取宇宙学的约束，使用的似然函数构造成独立的集群选择函数。在$10<r\,[$ \Mpch $]<40$尺度范围内对红移空间聚类进行建模，得到了$Ω_{\rm M}=0.27_{-0.04}^{+0.06}$和$b_{eff}=2.73_{-0.20}^{+0.18}$。这是第一次在如此相对高的红移和低的质量下测量X射线选择星团目录的两点关联函数。XXL星系团的聚集似乎完全符合标准的宇宙学预测。在这项工作中提出的分析表明，宇宙学开发的XXL集群聚类的可行性，铺平了道路的XXL集群数计数和聚类的综合分析。
英文摘要：
Galaxy clusters trace the highest density peaks in the large-scale structure of the Universe. Their clustering provides a powerful probe that can be exploited in combination with cluster mass measurements to strengthen the cosmological constraints provided by cluster number counts. We investigate the spatial properties of a homogeneous sample of X-ray selected galaxy clusters from the XXL survey, the largest programme carried out by the XMM-Newton satellite. The measurements are compared to $Λ$-cold dark matter predictions, and used in combination with self-calibrated mass scaling relations to constrain the effective bias of the sample, $b_{eff}$, and the matter density contrast, $Ω_{\rm M}$. We measured the angle-averaged two-point correlation function of the XXL cluster sample. The analysed catalogue consists of $182$ X-ray selected clusters from the XXL second data release, with median redshift $\langle z \rangle=0.317$ and median mass $\langle M_{500} \rangle\simeq1.3\cdot10^{14} M_\odot$. A Markov chain Monte Carlo analysis is performed to extract cosmological constraints using a likelihood function constructed to be independent of the cluster selection function. Modelling the redshift-space clustering in the scale range $10<r\,[$\Mpch$]<40$, we obtain $Ω_{\rm M}=0.27_{-0.04}^{+0.06}$ and $b_{eff}=2.73_{-0.20}^{+0.18}$. This is the first time the two-point correlation function of an X-ray selected cluster catalogue at such relatively high redshifts and low masses has been measured. The XXL cluster clustering appears fully consistent with standard cosmological predictions. The analysis presented in this work demonstrates the feasibility of a cosmological exploitation of the XXL cluster clustering, paving the way for a combined analysis of XXL cluster number counts and clustering.
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