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arXiv 0806.4019astro-ph
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从大质量星系团巡天探测最远星系团周围的大尺度结构

Probing the Large-Scale Structure Around the Most Distant Galaxy Clusters from the Massive Cluster Survey

Jeyhan S. Kartaltepe, Harald Ebeling, C. J. Ma, David Donovan

摘要:

我们目前的宇宙大尺度结构周围的12个最遥远的星系团的大规模集群调查(MACS)跟踪的星系团红色序列的投影表面密度。本研究中使用的图像是由斯巴鲁望远镜上的Suprime-Cam宽视场照相机拍摄的,覆盖了每个星团周围27 × 27弧分^2的区域,相当于我们样本在中位红移z = 0.55处的10 × 10 Mpc ^2。我们直接检测到卫星集群和长丝延伸超过我们的成像数据的大部分集群研究的全尺寸,支持通过沿长丝下降集群的生长和大尺度结构的演化的数值模拟所建议的质量吸积的图片。比较星系团核心附近的星系分布与钱德拉观测到的X射线表面亮度,在几种情况下,气体和星系分布之间存在显着的偏移,表明正在进行的合并事件。这两个系统非常适合研究气体、星系和暗物质的动力学性质。此外,在这些MACS集群中以高对比度观察到的大尺度细丝是直接探测和研究温热星系际介质(WHIM)的主要目标。

英文摘要:

We present maps of the cosmic large-scale structure around the twelve most distant galaxy clusters from the Massive Cluster Survey (MACS) as traced by the projected surface density of galaxies on the cluster red sequence. Taken with the Suprime-Cam wide-field camera on the Subaru telescope, the images used in this study cover a 27x27 arcmin^2 area around each cluster, corresponding to 10 x 10 Mpc^2 at the median redshift of z = 0.55 of our sample. We directly detect satellite clusters and filaments extending over the full size of our imaging data in the majority of the clusters studied, supporting the picture of mass accretion via infall along filaments suggested by numerical simulations of the growth of clusters and the evolution of large-scale structure. A comparison of the galaxy distribution near the cluster cores with the X-ray surface brightness as observed with Chandra reveals, in several cases, significant offsets between the gas and galaxy distribution, indicative of ongoing merger events. The respective systems are ideally suited for studies of the dynamical properties of gas, galaxies, and dark matter. In addition, the large-scale filaments viewed at high contrast in these MACS clusters are prime targets for the direct detection and study of the warm-hot intergalactic medium (WHIM).

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