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arXiv 1012.1610astro-ph.CO
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Sunyaev-Zel'dovich天线阵31 GHz巡天的宇宙学约束

Cosmological Constraints from a 31 GHz Sky Survey with the Sunyaev-Zel'dovich Array

Stephen Muchovej, Erik Leitch, John E Carlstrom, Thomas Culverhouse, Chris Greer, David Hawkins, Ryan Hennessy, Marshall Joy, James Lamb, Michael Loh, Daniel P … 展开作者

Stephen Muchovej, Erik Leitch, John E Carlstrom, Thomas Culverhouse, Chris Greer, David Hawkins, Ryan Hennessy, Marshall Joy, James Lamb, Michael Loh, Daniel P Marrone, Amber Miller, Tony Mroczkowski, Clem Pryke, Matthew Sharp, David Woody

摘要:

本文介绍了在31 GHz频率下利用Sunyaev- Zel'dovich效应对星系团进行6.1平方度巡天的结果。从2005年末到2007年中期,Sunyaev-Zel'dovich阵列(SZA)观测到了四个大约1.5平方度的磁场。其中一个区域显示出明显的弥漫性银河辐射的证据,因此我们将我们的分析限制在剩下的4.4平方度。我们使用模拟星系团的模拟观测来估计巡天的星系团可探测性;并确定,在中等红移(z ~ 0.8)时,巡天完成了50%,极限质量(M200 ρ平均值)为~ 6.0 x 10^14 M_{solar},质量极限在更高的红移处降低。我们没有检测到显著性大于图中RMS噪声水平5倍的星系团,并将σ_8(8h^-1 Mpc尺度上的质量密度波动幅度)的上限设为0.84 + 0.07(95%置信度),其中不确定性反映了校准和系统效应。这一结果与其他集群调查和CMB各向异性实验的估计是一致的。

英文摘要:

We present the results of a 6.1 square degree survey for clusters of galaxies via their Sunyaev- Zel'dovich (SZ) effect at 31 GHz. From late 2005 to mid 2007 the Sunyaev-Zel'dovich Array (SZA) observed four fields of roughly 1.5 square degrees each. One of the fields shows evidence for significant diffuse Galactic emission, and we therefore restrict our analysis to the remaining 4.4 square degrees. We estimate the cluster detectability for the survey using mock observations of simulations of clusters of galaxies; and determine that, at intermediate redshifts (z ~ 0.8), the survey is 50% complete to a limiting mass (M200 rho mean) of ~ 6.0 x 10^14M_{solar}, with the mass limit decreasing at higher redshifts. We detect no clusters at a significance greater than 5 times the RMS noise level in the maps, and place an upper limit on σ_8, the amplitude of mass density fluctuations on a scale of 8h^-1 Mpc, of 0.84 + 0.07 at 95% confidence, where the uncertainty reflects calibration and systematic effects. This result is consistent with estimates from other cluster surveys and CMB anisotropy experiments.

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