根据Sunyaev-Zel'dovich效应和X射线数据对环银河系介质的约束
Constraints on circum-galactic media from Sunyaev-Zel'dovich effects and X-ray data
摘要：
我们使用观测测量的热和动力学Sunyaev-Zel'dovich效应，以及软X射线发射与星系群约束的气体密度和温度在环星系介质（CGM）的暗物质晕质量以上$10^{12.5}M_{\odot}$。一些通用模型与贝叶斯方案一起使用，以进行模型推断。我们发现，气体与一个单一的温度成分不能提供一个一致的模式，以配合观测数据。一个简单的两相模型假设一个热的组件和一个电离的温暖的组件可以容纳所有的三个观测。个别晕中的气体总量被推断为与对应于晕质量的普适重子分数相当。热分量的推断温度与晕维里温度相当。热分量的分数从$10^{12.5}{M}_\odot$晕的$(15-40)\%$增加到$10^{14.5}{M}_\odot$晕的$(40-60)\%$，其中范围反映了假定气体密度分布的不确定性。我们的研究结果表明，一个显着的比例的晕气体是在一个非热化组件的温度远低于维里温度。
英文摘要：
We use observational measurements of thermal and kinetic Sunyaev-Zel'dovich effects, as well as soft X-ray emission associated with galaxy groups to constrain the gas density and temperature in the circumgalactic medium (CGM) for dark matter halos with masses above $10^{12.5}M_{\odot}$. A number of generic models are used together with a Bayesian scheme to make model inferences. We find that gas with a single temperature component cannot provide a consistent model to match the observational data. A simple two-phase model assuming a hot component and an ionized warm component can accommodate all the three observations. The total amount of the gas in individual halos is inferred to be comparable to the universal baryon fraction corresponding to the halo mass. The inferred temperature of the hot component is comparable to the halo virial temperature. The fraction of the hot component increases from $(15-40)\%$ for $10^{12.5}{M}_\odot$ halos to $(40-60)\%$ for $10^{14.5}{M}_\odot$ halos, where the ranges reflect uncertainties in the assumed gas density profile. Our results suggest that a significant fraction of the halo gas is in a non-thermalized component with temperature much lower than the virial temperature.
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