Gas Density and X-Ray Surface Brightness Profiles of Clusters of Galaxies from Dark Matter Halo Potentials: Beyond the Isothermal β-Model
Gas Density and X-Ray Surface Brightness Profiles of Clusters of Galaxies from Dark Matter Halo Potentials: Beyond the Isothermal β-Model
复制标题
暗物质晕势的星系团的气体密度和 X 射线表面亮度剖面：超越等温 β 模型
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
N. Makino
中科院分区：
文献类型：
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作者：
Y. Suto;S. Sasaki;N. Makino
我们描述了一个理论框架来计算流体静力学平衡下嵌入在一类球形暗物质晕势中的团簇气体分布。与传统的等温β模型不同，本方法提供了一个直接从星系团X射线表面亮度和温度剖面探测暗物质晕形状的物理基础。具体来说，我们研究在何种程度上所产生的气体密度和X射线表面亮度分布是敏感的暗物质晕密度和其他更现实的影响，包括气体的自引力和多方状态方程的内部斜率。我们还讨论了一个实用的策略，适用于本方法的实际集群配置文件从未来的X射线观测。
We describe a theoretical framework to compute the cluster gas distribution in hydrostatic equilibrium embedded in a class of spherical dark matter halo potentials. Unlike the conventional isothermal β-model, the present method provides a physical basis to directly probe the shape of the dark matter halo from the observed X-ray surface brightness and temperature profiles of clusters of galaxies. Specifically, we examine the extent to which the resulting gas density and X-ray surface brightness profiles are sensitive to the inner slope of the dark matter halo density and other more realistic effects, including the self-gravity of the gas and the polytropic equation of state. We also discuss a practical strategy to apply the present methodology to the actual cluster profiles from future X-ray observations.