论文标题
由Erosita捕获的主要星系集合合并：弱透镜质量分布和运动学描述
A major galaxy cluster merger caught by eROSITA: weak lensing mass distribution and kinematic description
论文作者
论文摘要
我们介绍了在$ z {\ rm photo} \ sim 0.36 $属于最近在erosita性能验证阶段发现的超级集群的三重合并聚类候选候选者的弱透镜质量分布。我们的分析通过确认聚类对EFEDS J093513.3+004746和EFEDS J093510.7+004910通过确认合并分类的先前张力，正在以质量比1.7 _ _ _ { - 0.7}^{ - 0.7}^{+0.5} $进行主要合并。根据我们的两体运动描述，在一个支持观察到的无线电遗物位置的情况下，相遇发生了$ 0.58 _ { - 0.20}^{+0.15} $ gyr ogo。但是，相同的分析表明，伴随群集EFEDS J093501.1+005418在相互作用系统上没有重力结合，因此它不是超级群集的一部分。我们还检查了采用缩放关系以确定光晕浓度$ C_ {200} $的影响。在观察到的合并阶段，簇$ \ sim $ \ sim $ \ sim $ 55到达apoapsis的路径的55％，选择$ c_ {200} $（无论是从质量关系中还是从质量模型中的自由参数）都不会发生巨大变化。
We present the weak lensing mass distribution of a triple merging cluster candidate at $z_{\rm photo}\sim 0.36$ belonging to a supercluster recently discovered during the eROSITA Performance Verification phase. Our analysis solved a previous tension in the merger classification by confirming that the cluster pair eFEDS J093513.3+004746 and eFEDS J093510.7+004910 is undergoing a major merger with a mass ratio $1.7_{-0.7}^{+0.5}$. According to our two-body kinematic description, the encounter happened $0.58_{-0.20}^{+0.15}$ Gyr ago, in a scenario that supports the observed radio relic position at the cluster outskirts. However, the same analysis showed that the companion cluster, eFEDS J093501.1+005418, is not gravitationally bound to the interacting system and therefore it is not part of the supercluster. We also checked the impact of adopting a scaling relation to determine the halo concentration $c_{200}$. At the observed merger stage, where the clusters have travelled $\sim$55 per cent of the path to reach the apoapsis, the choice of the $c_{200}$ (whether from a scaling relation or a free parameter in the mass model) does not change significantly either the cluster masses or the kinematic description.
