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arXiv 1909.09102astro-ph.CO
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通过galaxy-tSZ互相关层析测量星系际气体压力

Tomographic measurement of the intergalactic gas pressure through galaxy-tSZ cross-correlations

Nick Koukoufilippas, David Alonso, Maciej Bilicki, John A. Peacock

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19 pages, 10 figures. Published in MNRAS. Analysis pipeline available at https://github.com/nikfilippas/yxg
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摘要：

我们交叉相关的热Sunyaev-Zeldovich（tSZ）的康普顿- $y$参数公布的普朗克与星系的投影分布在一组低红移层析箱的地图。我们使用几乎全天空的2 MASS测光红移和WISE $\times$ SuperCOSMOS公开星表，覆盖红移范围$z\lesssim0.4$。我们的测量使我们能够把约束的红移依赖的质量可观测的关系tSZ集群计数分析在所谓的“流体静力学质量偏差”参数$1-b_{\rm H}$。这些结果也可以解释为测量的偏差加权平均气体压力$\langle bP_e\rangle$的红移，一个数量，可以与气体的热力学内晕和用于约束能量注入过程的函数。我们测量$1-b_{\rm H}$与$\sim6\%$的精度在6个均匀的红移箱，并没有发现红移依赖的质量偏差参数的证据，与以前的分析一致。我们的平均值的$1-b_{\rm H} = 0.75\pm0.03$也是在良好的协议与普朗克集团计数和CMB各向异性与CMB透镜校准的联合分析估计。我们的测量$\langle bP_e\rangle$，在$\sim10\%$的水平，在每个箱，是最严格的约束，这个参数的红移依赖，并同意与以前的测量和理论预期的冲击加热模型。

英文摘要：

We cross-correlate maps of the thermal Sunyaev-Zeldovich (tSZ) Compton-$y$ parameter published by Planck with the projected distribution of galaxies in a set of low-redshift tomographic bins. We use the nearly full-sky 2MASS Photometric Redshift and WISE $\times$ SuperCOSMOS public catalogues, covering the redshift range $z\lesssim0.4$. Our measurements allow us to place constraints on the redshift dependence of the mass-observable relation for tSZ cluster count analyses in terms of the so-called 'hydrostatic mass bias' parameter $1-b_{\rm H}$. These results can also be interpreted as measurements of the bias-weighted average gas pressure $\langle bP_e\rangle$ as a function of redshift, a quantity that can be related to the thermodynamics of gas inside haloes and used to constrain energy injection processes. We measure $1-b_{\rm H}$ with $\sim6\%$ precision in 6 equispaced redshift bins, and find no evidence for a redshift-dependent mass bias parameter, in agreement with previous analyses. Our mean value of $1-b_{\rm H} = 0.75\pm0.03$ is also in good agreement with the one estimated by the joint analysis of Planck cluster counts and CMB anisotropies calibrated with CMB lensing. Our measurements of $\langle bP_e\rangle$, at the level of $\sim10\%$ in each bin, are the most stringent constraints on the redshift dependence of this parameter to date, and agree well both with previous measurements and with theoretical expectations from shock-heating models.

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