arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1003.0003astro-ph.CO
收藏

2008年South Pole望远镜观测中的Sunyaev-Zel'dovich效应星系团

Galaxy Clusters Selected with the Sunyaev-Zel'dovich Effect from 2008 South Pole Telescope Observations

K. Vanderlinde, T. M. Crawford, T. de Haan, J. P. Dudley, L. Shaw, P. A. R. Ade, K. A. Aird, B. A. Benson, L. E. Bleem, M. Brodwin, J. E. Carlstrom, C. L. Chang… 展开作者

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

摘要:

我们提出了一个检测意义有限的目录21 Sunyaev Zel 'dovich选择星系团。2008年,南极望远镜在150 GHz的频率下,在18 uK弧分的深度范围内,在178 deg^2的天空中发现了这些星团以及一个未经证实的候选星团。布兰科宇宙学巡天(BCS)和麦哲伦望远镜的光学成像提供了测光(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。在这21个已确认的星系团中,有3个先前被确认为阿贝尔星系团,有3个是Staniszewski等人在2009年的SPT发现,还有3个是Menanteau等人在2010年的BCS数据分析中首次确认的;剩下的12个星系团是首次在这项工作中提出。对SPT场的模拟观测预测,在z = 0.6时,在质量阈值M_200 ~ 5x10^14 M_sun/h以上,样品几乎100%完整。随着红移的增加,这个完整性阈值会推到较低的质量,在z=1时下降到~4x10^14 M_sun/h。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,我们使用的集群目录,以改善宇宙学参数的估计。假设一个标准的空间平坦的wCDM宇宙学模型,我们的星表加入到WMAP 7年分析中得到sigma_8 = 0.81 +- 0.09和w = -1.07 +- 0.29,这两个参数的精度比单独的WMAP 7提高了约50%。

英文摘要:

We present a detection-significance-limited catalog of 21 Sunyaev-Zel'dovich selected galaxy clusters. These clusters, along with 1 unconfirmed candidate, were identified in 178 deg^2 of sky surveyed in 2008 by the South Pole Telescope to a depth of 18 uK-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, three were previously identified as Abell clusters, three were presented as SPT discoveries in Staniszewski et al, 2009, and three were first identified in a recent analysis of BCS data by Menanteau et al, 2010; 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 M_200 ~ 5x10^14 M_sun/h at z = 0.6. This completeness threshold pushes to lower mass with increasing redshift, dropping to ~4x10^14 M_sun/h 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 the cluster catalog to improve estimates of cosmological parameters. Assuming a standard spatially flat wCDM cosmological model, the addition of our catalog to the WMAP 7-year analysis yields sigma_8 = 0.81 +- 0.09 and w = -1.07 +- 0.29, a ~50% improvement in precision on both parameters over WMAP7 alone.

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。

↑