GALAXY CLUSTERS SELECTED WITH THE SUNYAEV–ZEL'DOVICH EFFECT FROM 2008 SOUTH POLE TELESCOPE OBSERVATIONS-猫眼课题宝

DOI：

10.1088/0004-637x/722/2/1180

发表时间：

2010-03

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

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

我们提出了一个检测意义有限的目录21 Sunyaev-Zel 'dovich选择的星系团。这些星团，沿着一个未经证实的候选者，在2008年由南极望远镜（SPT）在150 GHz下测量到18 μ K弧分的深度时在178 deg2的天空中被识别。布兰科宇宙学巡天（BCS）和麦哲伦望远镜的光学成像提供了光度（在某些情况下是光谱）红移估计，星表红移范围从z = 0.15到z> 1，中值z = 0.74。在21个确认的星系团中，3个以前被确定为阿贝尔星系团，3个是Staniszewski等人的SPT发现，Menanteau等人在最近对BCS数据的分析中首次确定了3个;其余12个组群在本工作中首次提出。对SPT场的模拟观测预测，在z = 0.6时，样品在质量阈值M200 5 × 1014 M·h − 1以上几乎100%完整。这个完整性阈值随着红移的增加而降低质量，在z = 1时下降到104 × 1014 M的质量。这个星表的大小和红移分布与我们目前对星系团和宇宙学的理解的预期非常一致。结合其他宇宙学探测，我们使用这个集群目录，以提高宇宙学参数的估计。假设一个标准的空间平坦的wCDM宇宙学模型，将我们的星表加入到WMAP 7年的结果中，得到σ 8 = 0.81 ± 0.09和w = − 1.07 ± 0.29，这两个参数的精度都比单独的WMAP 7提高了约50%。

We present a detection-significance-limited catalog of 21 Sunyaev–Zel'dovich-selected galaxy clusters. These clusters, along with one unconfirmed candidate, were identified in 178 deg2 of sky surveyed in 2008 by the South Pole Telescope (SPT) to a depth of 18 μK arcmin at 150 GHz. Optical imaging from the Blanco Cosmology Survey (BCS) and Magellan telescopes provided photometric (and in some cases spectroscopic) redshift estimates, with catalog redshifts ranging from z = 0.15 to z>1, with a median z = 0.74. Of the 21 confirmed galaxy clusters, 3 were previously identified as Abell clusters, 3 were presented as SPT discoveries in Staniszewski et al., and 3 were first identified in a recent analysis of BCS data by Menanteau et al.; the remaining 12 clusters are presented for the first time in this work. Simulated observations of the SPT fields predict the sample to be nearly 100% complete above a mass threshold of M200 ≈ 5 × 1014 M☉ h−1 at z = 0.6. This completeness threshold pushes to lower mass with increasing redshift, dropping to ∼4 × 1014 M☉ h−1 at z = 1. The size and redshift distribution of this catalog are in good agreement with expectations based on our current understanding of galaxy clusters and cosmology. In combination with other cosmological probes, we use this cluster catalog to improve estimates of cosmological parameters. Assuming a standard spatially flat wCDM cosmological model, the addition of our catalog to the WMAP seven-year results yields σ8 = 0.81 ± 0.09 and w = −1.07 ± 0.29, a ∼50% improvement in precision on both parameters over WMAP7 alone.

GALAXY CLUSTERS SELECTED WITH THE SUNYAEV–ZEL'DOVICH EFFECT FROM 2008 SOUTH POLE TELESCOPE OBSERVATIONS

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