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arXiv 2102.07701astro-ph.CO
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用KiDS Galaxies-tSZ-CMB透镜互相关探测星系偏差和星系际气体压力

Probing galaxy bias and intergalactic gas pressure with KiDS Galaxies-tSZ-CMB lensing cross-correlations

Ziang Yan, Ludovic van Waerbeke, Tilman Tröster, Angus H. Wright, David Alonso, Marika Asgari, Maciej Bilicki, Thomas Erben, Shiming Gu, Catherine Heymans, Hend… 展开作者

Ziang Yan, Ludovic van Waerbeke, Tilman Tröster, Angus H. Wright, David Alonso, Marika Asgari, Maciej Bilicki, Thomas Erben, Shiming Gu, Catherine Heymans, Hendrik Hildebrandt, Gary Hinshaw, Nick Koukoufilippas, Arun Kannawadi, Konrad Kuijken, Alexander Mead, HuanYuan Shan

备注：
20 pages, 14 figures, 3 tables, accepted for publication on Astronomy & Astrophysics
发表信息：
A&A 651, A76 (2021)
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摘要：

我们约束的气体压力偏置$\left\langle b_{y} P_{\mathrm{e}}\right\rangle$（偏置加权平均电子压力），这是星系际气体的热力学特征的红移依赖，通过星系位置和热Sunyaev-Zeldovich（tSZ）效应之间的交叉相关性，以及星系的位置和引力透镜的宇宙微波背景（CMB）的组合。星系样本来自Kilo-Degree Survey（KiDS）的第四次数据发布。tSZ $y$图和CMB透镜图分别来自{ \textit{Planck} } 2015年和2018年的数据发布。用$z\lesssim1$在五个红移仓中进行测量。通过这些测量，结合星系tSZ和星系CMB透镜交叉相关，使我们能够打破星系偏差和气体压力偏差之间的简并性，从而同时约束它们。在所有的红移仓中，$\bpe$的最佳拟合值都在$\sim 0.3\, \mathrm{meV/cm^3}$的水平上，并随着红移而略有增加。星系的偏置在所有的红移区间都是一致的。我们的结果是不敏感的非线性细节的互相关，这是平滑的{ \textit{Planck} }梁。我们的测量结果与以前的测量结果以及理论预测一致。我们还表明，我们的结论并没有改变时，CMB透镜被星系透镜，这表明的一致性的两个透镜信号，尽管其根本不同的红移范围。这项研究表明，使用CMB透镜校准星系分布，使星系分布可以作为一个质量代理，而不依赖于精确的知识的物质分布的可行性。

英文摘要：

We constrain the redshift dependence of gas pressure bias $\left\langle b_{y} P_{\mathrm{e}}\right\rangle$ (bias-weighted average electron pressure), which characterises the thermodynamics of intergalactic gas, through a combination of cross-correlations between galaxy positions and the thermal Sunyaev-Zeldovich (tSZ) effect, as well as galaxy positions and the gravitational lensing of the cosmic microwave background (CMB). The galaxy sample is from the fourth data release of the Kilo-Degree Survey (KiDS). The tSZ $y$ map and the CMB lensing map are from the {\textit{Planck}} 2015 and 2018 data releases, respectively. The measurements are performed in five redshift bins with $z\lesssim1$. With these measurements, combining galaxy-tSZ and galaxy-CMB lensing cross-correlations allows us to break the degeneracy between galaxy bias and gas pressure bias, and hence constrain them simultaneously. In all redshift bins, the best-fit values of $\bpe$ are at a level of $\sim 0.3\, \mathrm{meV/cm^3}$ and increase slightly with redshift. The galaxy bias is consistent with unity in all the redshift bins. Our results are not sensitive to the non-linear details of the cross-correlation, which are smoothed out by the {\textit{Planck}} beam. Our measurements are in agreement with previous measurements as well as with theoretical predictions. We also show that our conclusions are not changed when CMB lensing is replaced by galaxy lensing, which shows the consistency of the two lensing signals despite their radically different redshift ranges. This study demonstrates the feasibility of using CMB lensing to calibrate the galaxy distribution such that the galaxy distribution can be used as a mass proxy without relying on the precise knowledge of the matter distribution.

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