arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1409.0690astro-ph.COastro-ph.GAastro-ph.IM
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演化在普朗克$Y_{SZ}$质量校准中的重要作用

The important role of evolution in the Planck $Y_{SZ}$-mass calibration

S. Andreon

摘要:

鉴于普朗克宇宙微波背景的宇宙学参数与星系团之间的紧张关系,我们修改了$Y_{SZ}$的普朗克分析-质量校准,以允许由数据确定演化,而不是作为外部约束施加。我们的分析使用了与普朗克团队相同的数据和Malmquist偏差修正,以强调结果的差异来自假设的差异。从71个校准的集群,与$0.05<z<0.45$的演变,是成正比的$E^{2.5\pm0.4}(z)$,所以不一致的自相似的演变($E^{2/3}$)由以前的分析假设。当考虑演化时,$Y_{SZ}$ -质量关系的斜率为$1.51\pm0.07$,其比假设自相似演化时导出的值浅$4.8σ$,引入了质量依赖性偏差。$Y_{SZ}$的非自相似演化必须在旨在建立普朗克质量偏差的分析中得到解释。

英文摘要:

In light of the tension between cosmological parameters from Planck cosmic microwave background and galaxy clusters, we revised the Planck analysis of the $Y_{SZ}$-mass calibration to allow evolution to be determined by the data instead of being imposed as an external constraint. Our analysis uses the very same data and Malmquist bias corrections as used by the Planck team in order to emphasize that differences in the results come from differences in the assumptions. The evolution derived from 71 calibrating clusters, with $0.05<z<0.45$, is proportional to $E^{2.5\pm0.4}(z)$, so inconsistent with the self-similar evolution ($E^{2/3}$) assumed by previous analyses. When allowing for evolution, the slope of $Y_{SZ}$-mass relation turns out to be $1.51\pm0.07$, which is shallower by $4.8σ$ than the value derived when assuming self-similar evolution, introducing a mass-dependent bias. The non-self-similar evolution of $Y_{SZ}$ has to be accounted for in analyses aimed to establish the biases of Planck masses.

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