标题： 大尺度结构中星系团热塞曼效应的稳健性对光学集群选择偏差的分析 显示英文标题

标题： Robustness of Pairwise Kinematic SZ Effect to Optical Cluster Selection Bias

摘要： 双对运动学Sunyaev-Zel'dovich（kSZ）测量既反映了大质量团之间的相对运动，也反映了它们内部的气体含量，从而成为宇宙增长的一个示踪剂。为了理解kSZ中的宇宙学信息，理解光学团簇选择偏差对kSZ可观测量的影响至关重要。视线结构既能贡献于光学可观测量（如丰富度），也能贡献于kSZ信号，这可能在固定团簇质量的情况下在这两个量之间诱导出相关性。这种相关性导致的选择偏差是宇宙学分析中的一个关键系统效应，并有可能解决来自DES-Y1团簇计数、弱透镜和Planck的宇宙学限制之间的张力。为了测试这种偏差的kSZ等效效应，我们采用了一种基于视线方向圆柱体积内星系计数的替代丰富度方法。我们将圆柱计数方法应用于一系列星系选择标准下的流体动力学模拟，为模拟团簇分配与DES-Y1一致的丰富度。我们将光学选择的团簇与质量选择的暗晕进行比较，在大约16%、10%和8%的不确定度范围内，未发现显著的双对kSZ、双对速度或光学深度偏差。 显示英文摘要

摘要： The pairwise Kinematic Sunyaev-Zel'dovich (kSZ) measures both the pairwise motion between massive groups and the amount of gas within them, providing a tracer for the cosmic growth. To interpret the cosmological information in kSZ, it is crucial to understand the optical cluster selection bias on the kSZ observables. Line-of-sight structures that contribute to both the optical observable (e.g. richness) and the kSZ signal can induce a correlation between these two quantities at fixed cluster mass. The selection bias arising from this correlation is a key systematic effect for cosmological analyses and has the potential to resolve the tension between the cosmological constraints from the DES-Y1 cluster counts, lensing, and Planck. In order to test for a kSZ equivalent of such a bias, we adopt an alternative mock richness based on galaxy counts within cylindrical volumes along the line-of-sight. We apply the cylindrical count method to hydrodynamical simulations across a wide range of galaxy selection criteria, assigning richness consistent with DES-Y1 to the mock clusters. We find no significant bias on pairwise kSZ, pairwise velocities, or optical depth, when comparing optically selected clusters to mass-selected halos, within our uncertainty limits of approximately 16, 10, and 8 per cent, respectively.