论文标题
飞溅对星系簇和组弱透镜质量估计的影响
The Effect of Splashback on Weak Lensing Mass Estimates of Galaxy Clusters and Groups
论文作者
论文摘要
暗物质光环的飞溅半径对应于通过插入物质和子结构到达的第一个伪造半径，使用多种观察方法（包括弱透镜测量值）在星系簇周围检测到。在此手稿中，我们介绍了光环密度曲线中的飞溅特征如何影响通过弱透镜测量结果得出的星系簇质量。我们发现，Splashback半径对$ m_ {200m} \ sim 10^{13.5} \ Mathrm {m_ \ odot} $的群体大小的晕有越来越大的影响。根据模型和所使用的径向尺度，簇/组质量的偏置可能低于0.1 dex。反过来，如果传播到集群宇宙学分析中，则这种偏差会导致$ω_m$值稍低。考虑到越来越严格的宇宙学限制来自光学宽场调查，因此考虑到群尺寸的暗物质光环的飞溅效应可能变得很重要。
The splashback radius of a dark matter halo, which corresponds to the first apocenter radius reached by infalling matter and substructures, has been detected around galaxy clusters using a multitude of observational methods, including weak lensing measurements. In this manuscript, we present how the splashback feature in the halo density profile affects galaxy cluster masses derived through weak lensing measurements if it is not accounted for. We find that the splashback radius has an increasingly large effect on group-sized halos towards $M_{200m} \sim 10^{13.5} \mathrm{M_\odot}$. Depending on the model and the radial scale used, the cluster/group masses can be biased low by more than 0.1 dex. This bias, in turn, would result in a slightly lower $Ω_m$ value if propagated into a cluster cosmology analysis. The splashback effect with group-sized dark matter halos may become important to consider, given the increasingly stringent cosmological constraints coming from optical wide-field surveys.
