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arXiv 0709.2300astro-ph
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用XLSSJ022403的XMM-牛顿和钱德拉观测值检验z = 1时星系团质量-可观测关系。9 -041328

Testing the galaxy cluster mass-observable relations at z = 1 with XMM-Newton and Chandra observations of XLSSJ022403.9-041328

B. J. Maughan, L. R. Jones, M. Pierre, S. Andreon, M. Birkinshaw, M. N. Bremer, F. Pacaud, T. J. Ponman, I. Valtchanov, J. Willis

摘要:

我们提出了一个深XMM-牛顿和钱德拉观测z=1.05星系团XLSSJ 022403.9 -041328(以下简称XLSSC 029)的分析,发现在XMM-牛顿大尺度结构调查。X射线发射气体的密度和温度分布被用来执行系统的流体静力学质量分析。这使我们能够测量团簇中的总质量和气体分数,并定义过密度半径R500和R2500。在这些半径范围内测量了XLSSC 029的整体性质,并与当地人口的性质进行了比较。气体的质量分数被认为是一致的本地集群。平均金属丰度为0.18 + 0.17 - 0.15 Zsol,排除集群核心区,与预测和观察到的演变一致。然后利用XLSSC 029的性质研究团簇在M-kT、YX-M和LX-M标度关系上的位置。在所有的情况下,观察到的XLSSC 029的性质符合简单的自相似演化的标度关系。这是在z > 1时这些关系演化的第一次测试,并支持在遥远星系团的宇宙学研究中使用标度关系。

英文摘要:

We present an analysis of deep XMM-Newton and Chandra observations of the z=1.05 galaxy cluster XLSSJ022403.9-041328 (hereafter XLSSC 029), detected in the XMM-Newton large scale structure survey. Density and temperature profiles of the X-ray emitting gas were used to perform a hydrostatic mass analysis of the system. This allowed us to measure the total mass and gas fraction in the cluster and define overdensity radii R500 and R2500. The global properties of XLSSC 029 were measured within these radii and compared with those of the local population. The gas mass fraction was found to be consistent with local clusters. The mean metal abundance was 0.18 +0.17 -0.15 Zsol, with the cluster core regions excluded, consistent with the predicted and observed evolution. The properties of XLSSC 029 were then used to investigate the position of the cluster on the M-kT, YX-M, and LX-M scaling relations. In all cases the observed properties of XLSSC 029 agreed well with the simple self-similar evolution of the scaling relations. This is the first test of the evolution of these relations at z > 1 and supports the use of the scaling relations in cosmological studies with distant galaxy clusters.

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