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arXiv 1111.0009astro-ph.CO
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XMM-牛顿遥远星系团计划揭示的0.9<z<~1.6的X射线发光星系团人口

The X-ray luminous galaxy cluster population at 0.9<z<~1.6 as revealed by the XMM-Newton Distant Cluster Project

R. Fassbender, H. Boehringer, A. Nastasi, R. Suhada, M. Muehlegger, A. de Hoon, J. Kohnert, G. Lamer, J. J. Mohr, D. Pierini, G. W. Pratt, H. Quintana, P. Rosat… 展开作者

R. Fassbender, H. Boehringer, A. Nastasi, R. Suhada, M. Muehlegger, A. de Hoon, J. Kohnert, G. Lamer, J. J. Mohr, D. Pierini, G. W. Pratt, H. Quintana, P. Rosati, J. S. Santos, A. D. Schwope

摘要:

作为XMM-牛顿遥远星系团计划(XDCP)的一部分,我们提出了迄今为止光谱证实的最大的X射线发光高红移星系团样本,包括22个系统,范围为0.9<z< \sim 1.6。所有系统最初都被选为超过76.1度^2非连续深度档案XMM-牛顿覆盖范围的扩展X射线源。我们测试和校准的最有前途的两个波段的红移估计技术的基础上的R-z和z-H颜色的有效的遥远的集群识别,并找到一个良好的红移精度性能的z-H颜色至少z \sim 1.5,而红移的演变的R-z颜色导致越来越大的不确定性,在z> \sim 0.9。我们提出了两个新发现的集群,XDCP J0338.5+0029在z=0.916和XDCP J0027.2+1714在z=0.959的第一个细节,并研究了SpARCS J 003550 -431224在z=1.335的X射线特性,这表明了沿着视线正在进行的主要合并活动的证据。我们提供了完整样品的X射线特性和基于光度的总质量估计,该样品的中位系统质量为M200 \simeq 2 \times 10^14 M \odot。与本星系团相比,z>0.9的星系中大多数都没有与X射线质心位置重合的中央优势星系,而是表现出明显的BCG偏移,从X射线中心到投影的中值约为50 kpc,与排名第二的星系\sim 0.3等的中值光度差距较小。我们估计一小部分的集群相关的NVSS 1.4GHz的无线电源的约30%,优先位于1'从X射线中心。z> \sim 1.5星系团环境中的星系群首次显示了星系高质量端发生剧烈变化的证据,以及随着大质量星系中越来越多的大质量星系到致密核心区域观察到强烈的恒星形成活动,定义明确的星系团红色序列逐渐消失的迹象。

英文摘要:

We present the largest sample of spectroscopically confirmed X-ray luminous high-redshift galaxy clusters to date comprising 22 systems in the range 0.9<z<\sim1.6 as part of the XMM-Newton Distant Cluster Project (XDCP). All systems were initially selected as extended X-ray sources over 76.1 deg^2 of non-contiguous deep archival XMM-Newton coverage. We test and calibrate the most promising two-band redshift estimation techniques based on the R-z and z-H colors for efficient distant cluster identifications and find a good redshift accuracy performance of the z-H color out to at least z\sim1.5, while the redshift evolution of the R-z color leads to increasingly large uncertainties at z>\sim0.9. We present first details of two newly identified clusters, XDCP J0338.5+0029 at z=0.916 and XDCP J0027.2+1714 at z=0.959, and investigate the Xray properties of SpARCS J003550-431224 at z=1.335, which shows evidence for ongoing major merger activity along the line-of-sight. We provide X-ray properties and luminosity-based total mass estimates for the full sample, which has a median system mass of M200\simeq2\times10^14M\odot. In contrast to local clusters, the z>0.9 systems do mostly not harbor central dominant galaxies coincident with the X-ray centroid position, but rather exhibit significant BCG offsets from the X-ray center with a median value of about 50 kpc in projection and a smaller median luminosity gap to the second-ranked galaxy of \sim0.3mag. We estimate a fraction of cluster-associated NVSS 1.4GHz radio sources of about 30%, preferentially located within 1' from the X-ray center. The galaxy populations in z>\sim1.5 cluster environments show first evidence for drastic changes on the high-mass end of galaxies and signs for a gradual disappearance of a well-defined cluster red-sequence as strong star formation activity is observed in an increasing fraction of massive galaxies down to the densest core regions.

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