论文标题
中间半径的星系簇中封闭的重力质量与热气体质量之间的紧密相关性
A tight correlation between the enclosed gravitational mass and hot gas mass in galaxy clusters at intermediate radii
论文作者
论文摘要
许多研究指出，星系中不同半径的暗物质与男性物质之间存在一些紧密的相关性。但是，只有在大型半径的星系簇中才能找到类似的紧密相关性。在这里，我们报告了重力质量$ m _ {\ rm vrav} $与热气质量$ m _ {\ rm a vas} $之间的紧密相关性$ m _ {\ rm aver}（2R_C）$ vs $ m _ {\ rm als as}（2r_c）$）。通过使用具有不同尺寸和质量的64个大型星系簇的X射线数据，我们发现相关性可以通过单个关系$ \ log（m _ {\ rm grav}/m _ {\ odot}）=（0.74 \ pm 0.02）\ log（m _} \ rm _ {\ rm __} {\ rm al} {\ oct and} {0.74 \ pm 0.02） \ pm 0.23）$用于广泛的热气质量（$ 10^{11} m _ {\ odot} -10^{14} m _ {\ odot} $）。相应的相关系数和散射分别为0.97和0.10 dex。这将是第一个紧密相关的相关性，在中间半径（$ \ sim 100-1000 $ kpc）中，封闭的重力质量和热气体之间的散射非常小，它提供了一种新型的观察证据，以支持暗物质与桶之间的相关性。
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 $M_{\rm grav}$ and hot gas mass $M_{\rm gas}$ in galaxy clusters at the hot gas core radius $r_c$ and at $2r_c$ (i.e. $M_{\rm grav}(r_c)$ vs $M_{\rm gas}(r_c)$ and $M_{\rm grav}(2r_c)$ vs $M_{\rm gas}(2r_c)$). 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 $\log(M_{\rm grav}/M_{\odot})=(0.74 \pm 0.02) \log(M_{\rm gas}/M_{\odot})+(4.47 \pm 0.23)$ for a wide range of hot gas mass ($10^{11}M_{\odot}-10^{14}M_{\odot}$). 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 ($\sim 100-1000$ kpc) and it provides a new kind of observational evidence to support the universality of correlation between dark matter and baryons.
