arXiv 1701.090182017-01-31astro-ph.CO

Sunyaev-Zel'dovich和X射线巡天观测角互功率谱的宇宙学约束

Cosmological constraints from the observed angular cross-power spectrum between Sunyaev-Zel'dovich and X-ray surveys

G. Hurier, M. Douspis, N. Aghanim, E. Pointecouteau, J. M. Diego, J. F. Macias-Perez

发表信息：: 2015A&A...576A..90H
DOI：: 10.1051/0004-6361/201425555

摘要：

我们提出了第一次检测的交叉相关角功率谱之间的热Sunyaev-Zel'dovich（tSZ）效应和X射线发射在整个天空。tSZ效应和X射线是由星系群和星系团中的相同热气体产生的，这在它们之间产生了自然的强相关性，可以用来增强联合信号并导出宇宙学参数。我们计算了ROSAT全天巡天在0.5-2千电子伏的能量带和tSZ效果重建从六个普朗克全天70和545 GHz之间的频率图之间的相关性。我们检测到一个显着的相关性在很宽的角度尺度。在$50<\ell < 2000$范围内，在28 $σ$的总体显著性下检测到X射线与tSZ的互相关。作为我们系统研究的一部分，我们进行了活动星系核污染和宇宙红外背景与X射线之间的相关性的多频模拟。利用互相关信号对功率谱幅度的强依赖性，我们约束了$σ_8 = 0.804 \pm 0.037$，其中建模的不确定性主导统计和系统的不确定性。我们还导出了晕质量与X射线亮度标度关系的质量指数L $_{500}$ -M $_{500}$和SZ信号标度关系的质量指数Y $_{500}$ -M $_{500}$，$a_{\rm sz} + a_{\rm x} = 3.37 \pm 0.09$以及额外红移演化指数$β_{\rm sz} + β_{\rm x} = 0.4^{+0.4}_{-0.5}$的约束条件。

英文摘要：

We present the first detection of the cross-correlation angular power spectrum between the thermal Sunyaev-Zel'dovich (tSZ) effect and the X-ray emission over the full sky. The tSZ effect and X-rays are produced by the same hot gas within groups and clusters of galaxies, which creates a naturally strong correlation between them that can be used to boost the joint signal and derive cosmological parameters. We computed the correlation between the ROSAT All Sky Survey in the 0.5-2 keV energy band and the tSZ effect reconstructed from six Planck all-sky frequency maps between 70 and 545 GHz. We detect a significant correlation over a wide range of angular scales. In the range $50<\ell < 2000$, the cross-correlation of X-rays to tSZ is detected at an overall significance of 28 $σ$. As part of our systematic study, we performed a multi-frequency modelling of the AGN contamination and the correlation between cosmic infra-red background and X-rays. Taking advantage of the strong dependence of the cross-correlation signal on the amplitude of the power spectrum, we constrained $σ_8 = 0.804 \pm 0.037$, where modelling uncertainties dominate statistical and systematic uncertainties. We also derived constraints on the mass indices of scaling relations between the halo mass and X-ray luminosity, L$_{500}$-M$_{500}$, and SZ signal, Y$_{500}$-M$_{500}$, $a_{\rm sz} + a_{\rm x} = 3.37 \pm 0.09$, and on the indices of the extra-redshift evolution, $β_{\rm sz} + β_{\rm x} = 0.4^{+0.4}_{-0.5}$.

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