论文标题
Sunyaev-Zel'Dovich效果和X射线数据对圆周媒体的限制
Constraints on circum-galactic media from Sunyaev-Zel'dovich effects and X-ray data
论文作者
论文摘要
我们使用对热和动力学Sunyaev-Zel'Dovich效应的观察测量值，以及与星系基团相关的软X射线发射，以限制与质量（cgm）的气体密度和温度，用于暗物质卤素的质量，质量高于$ 10^{12.5} m_ _ {\ odot} $ 10^{12.5} M _ {\ odot} $。许多通用模型与贝叶斯方案一起使用，以进行模型推断。我们发现具有单个温度成分的气体无法提供一致的模型以匹配观察数据。一个简单的两相模型，假设有热成分和一个电离温暖的组件可以容纳所有三个观测值。推断单个光环中的气体总量可与对应于光晕质量的通用巴属分数相媲美。 HOT成分的推断温度与Halo病毒温度相当。 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.我们的结果表明，在非热温度的非热量组件中，大量的光环气体比病毒温度低得多。
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.
