论文标题
冲突星系簇中的径向加速关系
The Radial Acceleration Relation in CLASH Galaxy Clusters
论文作者
论文摘要
星系中的径向加速关系（RAR）描述了总加速度$ g_ \ mathrm {tot}（r）= gm_ \ mathrm {tot}（<r）/r^2 $之间的紧密经验缩放定律$ g_ \ mathrm {bar}（r）= gm_ \ mathrm {bar}（<r）/r^2 $，具有$ g_ \ dagger \ simeq 1.2 \ simeq 1.2 \ times 10^{-10} $ ms $ ms $^{ - 2} $的特征加速度比例。在这里，我们检查了使用弱透镜，坚固的透镜和X射线数据集在Galaxy簇中是否存在这种相关性，可用于Clash调查针对的20个高质量簇。通过将我们的冲突数据与最亮星系星系（BCG）的恒星质量估计结合在一起，并考虑群集中出色的重型型重成分，我们首次确定在BCG-簇尺度上进行RAR。所得的RAR通过紧密的权力关系很好地描述，$ g_ \ mathrm {tot} \ propto g_ \ mathrm {bar}^{0.51^{+0.04} _ { - 0.05}} $，带有$ 14.7^{+2.9}} $ $ 14.7^{2.9} _ { - 2.8。坡度与星系中RAR的低加速度极限一致，$ G_ \ Mathrm {tot} = \ sqrt {g_ \ dagger \，g_ \ dagger \，g_ \ mathrm {bar}} $ 10^{ - 9} $ MS $^{ - 2} $，表明没有通用RAR在从星系到簇的所有尺度上都符合。我们发现，冲突簇中观察到的RAR与标准$λ$ CDM框架中开发的半分析模型的预测一致。我们的结果还预测了Baryonic Faber-Jackson关系（$σ_V^4 \ propto m_ \ mathrm {bar} $）在集群秤上。
The radial acceleration relation (RAR) in galaxies describes a tight empirical scaling law between the total acceleration $g_\mathrm{tot}(r)=GM_\mathrm{tot}(<r)/r^2$ observed in galaxies and that expected from their baryonic mass $g_\mathrm{bar}(r)=GM_\mathrm{bar}(<r)/r^2$, with a characteristic acceleration scale of $g_\dagger\simeq 1.2\times 10^{-10}$ms$^{-2}$. Here, we examine if such a correlation exists in galaxy clusters using weak-lensing, strong-lensing, and X-ray data sets available for 20 high-mass clusters targeted by the CLASH survey. By combining our CLASH data with stellar mass estimates for the brightest cluster galaxies (BCGs) and accounting for the stellar baryonic component in clusters, we determine, for the first time, an RAR on BCG--cluster scales. The resulting RAR is well described by a tight power-law relation, $g_\mathrm{tot}\propto g_\mathrm{bar}^{0.51^{+0.04}_{-0.05}}$, with lognormal intrinsic scatter of $14.7^{+2.9}_{-2.8}\%$. The slope is consistent with the low acceleration limit of the RAR in galaxies, $g_\mathrm{tot}=\sqrt{g_\dagger\,g_\mathrm{bar}}$, whereas the intercept implies a much higher acceleration scale of $g_\ddagger = (2.02\pm0.11)\times 10^{-9}$ms$^{-2}$, indicating that there is no universal RAR that holds on all scales from galaxies to clusters. We find that the observed RAR in CLASH clusters is consistent with predictions from a semi-analytical model developed in the standard $Λ$CDM framework. Our results also predict the presence of a baryonic Faber--Jackson relation ($σ_v^4\propto M_\mathrm{bar}$) on cluster scales.
