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A tight correlation between the enclosed gravitational mass and hot gas mass in galaxy clusters at intermediate radii
Physics of the Dark Universe ( IF 5.0 ) Pub Date : 2020-01-28 , DOI: 10.1016/j.dark.2020.100478
Man Ho Chan

Many studies point out that there exists some tight correlations between dark matter and baryonic matter at different radii in galaxies. However, similar tight correlations can only be found in galaxy clusters for large radii. Here we report extremely tight correlations between the gravitational mass Mgrav and hot gas mass Mgas in galaxy clusters at the hot gas core radius rc and at 2rc (i.e. Mgrav(rc) vs Mgas(rc) and Mgrav(2rc) vs Mgas(2rc)). By using the X-ray data of 64 large galaxy clusters with different sizes and masses, we find that the correlations can be described by a single relation log(MgravM)=(0.74±0.02)log(MgasM)+(4.47±0.23) for a wide range of hot gas mass (1011M1014M). The corresponding correlation coefficient and scatter are 0.97 and 0.10 dex respectively. This would be the first tight correlation with very small scatter between the enclosed gravitational mass and hot gas mass for galaxy clusters within intermediate radii (1001000 kpc) and it provides a new kind of observational evidence to support the universality of correlation between dark matter and baryons.



中文翻译:

中间半径的星系团中封闭的引力质量和热气质量之间的紧密关系

许多研究指出,星系中不同半径的暗物质和重子物质之间存在紧密的联系。但是,类似的紧密相关只能在大半径​​的星系团中找到。在这里,我们报告了引力质量之间非常紧密的相关性中号重力 和热气量 中号加油站 在热气核心半径的星系团中 [RC2[RC (即 中号重力[RC中号加油站[RC中号重力2[RC中号加油站2[RC)。通过使用具有不同大小和质量的64个大型星系团的X射线数据,我们发现可以通过单个关系来描述相关性日志中号重力中号=074±002日志中号加油站中号+447±023 适用于各种热气量(1个011中号1个014中号)。相应的相关系数和散度分别为0.97和0.10 dex。对于中间半径范围内的星系团,这是封闭的引力质量和热气体质量之间散布很小的第一个紧密相关性(1001000 kpc),它提供了一种新的观测证据来支持暗物质和重子之间相关性的普遍性。

更新日期:2020-01-28
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