标题： SRG/eROSITA 全天候巡天。 弱引力透镜质量标定和星系质量与晕质量关系来自 Hyper Suprime-Cam Subaru 战略计划 显示英文标题

标题： The SRG/eROSITA All-Sky Survey. The Weak-Lensing Mass Calibration and the Stellar Mass-to-Halo Mass Relation from the Hyper Suprime-Cam Subaru Strategic Program

摘要： 我们展示了在$0.1<z<0.8$红移处的124个星系团和星系群的弱引力透镜质量校准，这是$eROSITA$全天调查第一数据发布的一部分（$eRASS1$），并利用来自 Hyper Suprime-Cam（HSC）Subaru战略计划的数据集，限定了它们的中心星系（BCG）恒星质量与晕质量及红移的关系。该星系团调查是由搭载在 Spectrum-Roentgen-Gamma 空间观测站上的$eROSITA$X射线望远镜进行的。该星系团样本是通过X射线选择并通过光学确认的，污染率极低。基于单个星系团，使用HSC三年弱引力透镜数据推导出$96$个星系团的剪切轮廓，而$101$个星系团的BCG恒星质量$M_{\star,\mathrm{BCG}}$则通过将HSC五波段测光数据与SED模板拟合来估算。 在群体建模中同时约束计数率（$C_{\mathrm{R}}-M-z$）和BCG恒星质量（$M_{\star,\mathrm{BCG}}-M-z$）的关系。 $C_{\mathrm{R}}-M-z$的关系揭示了$\propto M^{1.50^{+0.20}_{-0.30}}$的质量趋势，该趋势比自相似预测更陡峭，并且没有偏离自相似红移比例。 我们获得了$M_{\star,\mathrm{BCG}}-M-z$关系的质量（$B_{\mathrm{BCG}} = 0.25^{+0.11}_{-0.15}$）和红移（$\gamma_{\mathrm{BCG}} = 0.87^{+0.92}_{-0.78}$）标度的幂律指数，并发现它们之间存在强烈的退相干。 通过在$\gamma_{\mathrm{BCG}}$上采用信息先验以打破退化，我们得到了统计上一致的$M_{\star,\mathrm{BCG}}-M-z$关系。 我们的结果表明，在固定晕质量下，BCG恒星质量自红移$z\approx0.8$以来保持稳定，并有适度增加。 这一发现支持了“快速-然后缓慢”的BCG形成图景，其中大部分恒星质量必须是在更早的宇宙时期形成的。 显示英文摘要

摘要： We present the weak-lensing mass calibration of 124 galaxy clusters and groups at redshift $0.1<z<0.8$ in the first Data Release of the $eROSITA$ All-Sky Survey ($eRASS1$) and constrain their BCG stellar-mass-to-halo-mass-and-redshift relation, using the data sets from the Hyper Suprime-Cam (HSC) Subaru Strategic Program. The cluster survey is conducted by the $eROSITA$ X-ray telescope aboard the Spectrum-Roentgen-Gamma space observatory. The cluster sample is X-ray-selected and optically confirmed with a negligibly low contamination rate. On a basis of individual clusters, the shear profiles of $96$ clusters are derived using the HSC Three-Year weak-lensing data, while the BCG stellar masses $M_{\star,\mathrm{BCG}}$ of $101$ clusters are estimated using the SED template fitting to the HSC five-band photometry. The count rate ($C_{\mathrm{R}}-M-z$) and BCG stellar mass ($M_{\star,\mathrm{BCG}}-M-z$) relations are simultaneously constrained in a population modelling. The $C_{\mathrm{R}}-M-z$ relation reveals a mass trend of $\propto M^{1.50^{+0.20}_{-0.30}}$, which is steeper than the self-similar prediction, and no deviation from the self-similar redshift scaling. We obtain the power-law indices of the mass ($B_{\mathrm{BCG}} = 0.25^{+0.11}_{-0.15}$) and redshift ($\gamma_{\mathrm{BCG}} = 0.87^{+0.92}_{-0.78}$) scaling for the $M_{\star,\mathrm{BCG}}-M-z$ relation, and find a strong degeneracy between them. By adopting an informative prior on $\gamma_{\mathrm{BCG}}$ to break the degeneracy, we obtain a statistically consistent $M_{\star,\mathrm{BCG}}-M-z$ relation. Our results suggest that the BCG stellar mass at a fixed halo mass has remained stable with a moderate increase since redshift $z\approx0.8$. This finding supports the picture of the ``rapid-then-slow'' BCG formation, where the majority of the stellar mass must have been assembled at much earlier cosmic time.