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arXiv 1701.09016astro-ph.CO
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Sunyaev-Zel'dovich和X射线测量的互功率谱模拟

Modeling the cross power spectrum of Sunyaev-Zel'dovich and X-ray surveys

G. Hurier, N. Aghanim, M. Douspis

摘要:

热Sunyaev-Zel'dovich(tSZ)效应和星系团的X射线辐射已被广泛用于宇宙学参数的约束。这些约束是高度敏感的集群质量和可观的(tSZ和X射线通量)之间的关系。因此,交叉相关的tSZ和X射线数据是一个强大的工具,除了tSZ和X射线为基础的分析,以测试我们的建模的tSZ和X射线发射从星系团。我们选择探索这种交叉相关性,因为这两种辐射都追踪了星系团中的热气,因此构成了可以研究的最简单的相关性。本文建立了一个完整的模型,研究了tSZ效应与星系团X射线辐射之间的相互关系,并着重讨论了它们与星系团标度律和宇宙学参数之间的关系。我们发现,目前的宇宙学参数和标度律参数的知识导致的整体归一化的tSZ-X互相关功率谱的不确定性为47%。考虑到实际tSZ和X射线调查的灵敏度,我们提出了预期的信噪比的tSZ-X互相关角功率谱从{ \it普朗克}-类数据和ROSAT。我们证明,在现实情况下,该信噪比可以达到31.5,导致对tSZ-X互相关幅度的约束高达3.2%,比实际建模限制好15倍。因此,除了宇宙学参数和标度关系的其他探头使用,我们表明,tSZ-X是一个强大的探头,以约束标度关系和宇宙学参数。

英文摘要:

Thermal Sunyaev-Zel'dovich (tSZ) effect and X-ray emission from galaxy clusters have been extensively used to constrain cosmological parameters. These constraints are highly sensitive to the relations between cluster masses and observables (tSZ and X-ray fluxes). The cross-correlation of tSZ and X-ray data is thus a powerful tool, in addition of tSZ and X-ray based analysis, to test our modeling of both tSZ and X-ray emission from galaxy clusters. We chose to explore this cross correlation as both emissions trace the hot gas in galaxy clusters and thus constitute one the easiest correlation that can be studied. We present a complete modeling of the cross correlation between tSZ effect and X-ray emission from galaxy clusters, and focuses on the dependencies with clusters scaling laws and cosmological parameters. We show that the present knowledge of cosmological parameters and scaling laws parameters leads to an uncertainties of 47\% on the overall normalization of the tSZ-X cross correlation power spectrum. We present the expected signal-to-noise ratio for the tSZ-X cross-correlation angular power spectrum considering the sensitivity of actual tSZ and X-ray surveys from {\it Planck}-like data and ROSAT. We demonstrate that this signal-to-noise can reach 31.5 in realistic situation, leading to a constraint on the amplitude of tSZ-X cross correlation up to 3.2\%, fifteen times better than actual modeling limitations. Consequently, used in addition to other probes of cosmological parameters and scaling relations, we show that the tSZ-X is a powerful probe to constrain scaling relations and cosmological parameters.

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