arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1911.05751astro-ph.CO
收藏

星系团标度关系的宇宙学依赖

Cosmology dependence of galaxy cluster scaling relations

Priyanka Singh, Alex Saro, Matteo Costanzi, Klaus Dolag

备注：
15 pages, 8 figures, 8 tables. Accepted for publication in MNRAS
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

星系团的丰度与质量和红移的函数关系是一个著名的强有力的宇宙学探测，它依赖于质量可观测关系（MOR）的基本模型假设。一些MOR参数可以直接从多波长观测中得到，如参考宇宙学的归一化、质量斜率、红移演化和内禀散射。然而，MORs的宇宙学依赖性不能单独用多波长观测来测试。我们使用{ \tt Magneticum}模拟来探索星系团标度关系的宇宙学依赖性。我们运行了15个不同的流体动力学宇宙学模拟$Ω_m$，$Ω_b$，$h_0$和$σ_8$（围绕参考宇宙学模型）。考虑的MOR是气体质量，重子质量，气体温度，$Y$和速度色散作为维里质量的函数。我们验证的质量和红移斜率和内在的散射MORs是几乎独立的宇宙学的变化显着小于目前的观测不确定性。结果表明，在$h_0$上，气体质量和重子质量只敏感地依赖于重子分数、速度色散和气体温度，而$Y$同时依赖于重子分数和$h_0$ .我们调查的宇宙学意义上的MOR参数化的模拟目录创建一个理想化的eROSITA样实验。我们表明，我们的参数化引入了强烈的宇宙学参数和MOR的归一化之间的简并。最后，在不同的过密度（$Δ_{500c}$），X射线测辐射热气体光度，并为不同的次网格物理处方的参数约束在附录中显示。

英文摘要：

The abundance of galaxy clusters as a function of mass and redshift is a well known powerful cosmological probe, which relies on underlying modelling assumptions on the mass-observable relations (MOR). Some of the MOR parameters can be constrained directly from multi-wavelength observations, as the normalization at some reference cosmology, the mass-slope, the redshift evolution and the intrinsic scatter. However, the cosmology dependence of MORs cannot be tested with multi-wavelength observations alone. We use {\tt Magneticum} simulations to explore the cosmology dependence of galaxy cluster scaling relations. We run fifteen hydro-dynamical cosmological simulations varying $Ω_m$, $Ω_b$, $h_0$ and $σ_8$ (around a reference cosmological model). The MORs considered are gas mass, baryonic mass, gas temperature, $Y$ and velocity dispersion as a function of virial mass. We verify that the mass and redshift slopes and the intrinsic scatter of the MORs are nearly independent of cosmology with variations significantly smaller than current observational uncertainties. We show that the gas mass and baryonic mass sensitively depends only on the baryon fraction, velocity dispersion and gas temperature on $h_0$, and $Y$ on both baryon fraction and $h_0$. We investigate the cosmological implications of our MOR parameterization on a mock catalog created for an idealized eROSITA-like experiment. We show that our parametrization introduces a strong degeneracy between the cosmological parameters and the normalization of the MOR. Finally, the parameter constraints derived at different overdensity ($Δ_{500c}$), for X-ray bolometric gas luminosity, and for different subgrid physics prescriptions are shown in the appendix.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑