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arXiv 1106.2185astro-ph.CO
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WMAP中maxBCG SDSS星系团的Sunyaev-Zeldovich信号

The Sunyaev-Zeldovich Signal of the maxBCG SDSS Galaxy Clusters in WMAP

Patrick Draper, Scott Dodelson, Jiangang Hao, Eduardo Rozo

摘要:

普朗克合作测量了斯隆数字巡天光学选择的星系团的Sunyaev-Zel'dovich(SZ)减量,发现它大大低于基于maxBCG星系团现有质量校准的预期。要解决这种紧张关系,要么数据上升,要么理论预期下降。在这里,我们使用威尔金森微波各向异性探测器(WMAP)的数据进行一个独立的估计SZ递减maxBCG集群。恢复的信号与使用普朗克获得的信号一致,尽管由于WMAP的较大光束尺寸和较小的频率范围而具有较大的误差条。尽管如此,这一检测作为一个独立的确认的影响的大小,并表明,所观察到的差异必须是理论上的起源。

英文摘要:

The Planck Collaboration measured the Sunyaev-Zel'dovich (SZ) decrement of optically selected clusters from the Sloan Digital Sky Survey, finding that it falls significantly below expectations based on existing mass calibration of the maxBCG galaxy clusters. Resolving this tension requires either the data to go up, or the theoretical expectations to come down. Here, we use data from the Wilkinson Microwave Anisotropy Probe (WMAP) to perform an independent estimate of the SZ decrement of maxBCG clusters. The recovered signal is consistent with that obtained using Planck, though with larger error bars due to WMAP's larger beam size and smaller frequency range. Nevertheless, this detection serves as an independent confirmation of the magnitude of the effect, and demonstrates that the observed discrepancy must be theoretical in origin.

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