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arXiv 1003.0005astro-ph.CO
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根据2008年South Pole望远镜观测的Sunyaev-Zel'dovich效应选择星系团的光学红移和丰度估计

Optical Redshift and Richness Estimates for Galaxy Clusters Selected with the Sunyaev-Zel'dovich Effect from 2008 South Pole Telescope Observations

F. W. High, B. Stalder, J. Song, P. A. R. Ade, K. A. Aird, S. S. Allam, R. Armstrong, W. A. Barkhouse, B. A. Benson, E. Bertin, S. Bhattacharya, L. E. Bleem, M.… 展开作者

F. W. High, B. Stalder, J. Song, P. A. R. Ade, K. A. Aird, S. S. Allam, R. Armstrong, W. A. Barkhouse, B. A. Benson, E. Bertin, S. Bhattacharya, L. E. Bleem, M. Brodwin, E. J. Buckley-Geer, J. E. Carlstrom, P. Challis, C. L. Chang, T. M. Crawford, A. T. Crites, T. de Haan, S. Desai, M. A. Dobbs, J. P. Dudley, R. J. Foley, E. M. George, M. Gladders, N. W. Halverson, M. Hamuy, S. M. Hansen, G. P. Holder, W. L. Holzapfel, J. D. Hrubes, M. Joy, R. Keisler, A. T. Lee, E. M. Leitch, H. Lin, Y. -T. Lin, A. Loehr, M. Lueker, D. Marrone, J. J. McMahon, J. Mehl, S. S. Meyer, J. J. Mohr, T. E. Montroy, N. Morell, C. -C. Ngeow, S. Padin, T. Plagge, C. Pryke, C. L. Reichardt, A. Rest, J. Ruel, J. E. Ruhl, K. K. Schaffer, L. Shaw, E. Shirokoff, R. C. Smith, H. G. Spieler, Z. Staniszewski, A. A. Stark, C. W. Stubbs, D. L. Tucker, K. Vanderlinde, J. D. Vieira, R. Williamson, W. M. Wood-Vasey, Y. Yang, O. Zahn, A. Zenteno

摘要:

我们提出了红移和光学丰富度的性质,21个星系团均匀选择他们的Sunyaev-Zel'dovich签名。这些星团,加上一个额外的未经证实的候选者,是在2008年南极望远镜调查的178平方度的区域内发现的。使用从布兰科宇宙学调查和从尖麦哲伦望远镜观测,以及光谱使用麦哲伦设施的Griz成像,我们证实了集群的红序列星系的存在,报告红序列的光度红移,目前光谱红移的子样本,并获得R_200半径和M_200质量的光学丰富度。星系团的红移范围从0.15到大于1,中值红移为0.74;估计有三个星系团的红移z > 1。从平均红序列颜色推断的红移相对于z < 1的光谱子样本在sigma_z/(1+z)中表现出2%的RMS散射。我们表明,M_200星团质量来自光学丰富度与质量来自南极望远镜的数据,并同意以前推导的标度关系的不确定性。光学和红外成像是在大型Sunyaev-Zel'dovich巡天中进行星系团识别和红移估计的有效手段,并且利用相同的数据进行丰度测量,正如我们所做的那样,将有助于在宇宙学分析中约束大样本的星系团质量和半径。

英文摘要:

We present redshifts and optical richness properties of 21 galaxy clusters uniformly selected by their Sunyaev-Zel'dovich signature. These clusters, plus an additional, unconfirmed candidate, were detected in a 178 square-degree area surveyed by the South Pole Telescope in 2008. Using griz imaging from the Blanco Cosmology Survey and from pointed Magellan telescope observations, as well as spectroscopy using Magellan facilities, we confirm the existence of clustered red-sequence galaxies, report red-sequence photometric redshifts, present spectroscopic redshifts for a subsample, and derive R_200 radii and M_200 masses from optical richness. The clusters span redshifts from 0.15 to greater than 1, with a median redshift of 0.74; three clusters are estimated to be at z > 1. Redshifts inferred from mean red-sequence colors exhibit 2% RMS scatter in sigma_z/(1+z) with respect to the spectroscopic subsample for z < 1. We show that M_200 cluster masses derived from optical richness correlate with masses derived from South Pole Telescope data and agree with previously derived scaling relations to within the uncertainties. Optical and infrared imaging is an efficient means of cluster identification and redshift estimation in large Sunyaev-Zel'dovich surveys, and exploiting the same data for richness measurements, as we have done, will be useful for constraining cluster masses and radii for large samples in cosmological analysis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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