论文标题
由于使用RedMapper簇的投影效应，各向异性增强的观察性约束
Observational constraints of an anisotropic boost due to the projection effects using redMaPPer clusters
论文作者
论文摘要
从红色序列星系中鉴定出的光学簇会受到投影效应的影响，其中沿着视线到群集的介入星系被误认为是群集的真正成员。在先前的研究（Sunayama等，2020年）中，我们发现投影效应会导致在没有任何投影效应的情况下，大规模地促进了聚类和镜头的幅度。这些提升是由由于光度测量中的距离不确定性而导致的丝状结构的优先选择而引起的。我们用两个简单的假设对投影效应进行建模，并开发一种新的方法，使用群集 - 摩尔克斯互相关函数来量化增强的大小。我们使用由宇宙N体仿真构建的模拟群集目录来验证我们的方法，并发现我们可以使用模型对Boost参数获得无偏见的约束。然后，我们对SDSS Redmapper群集进行分析，并发现所有丰富度箱的增强量的大小约为20％，除了[30,40] $的Richness Bin $λ\的群集样品。这是第一个限制与集群宇宙学研究无关的增强参数的研究，并为投影效应提供了自洽测试。
Optical clusters identified from red-sequence galaxies suffer from projection effects, where interloper galaxies along the line-of-sight to a cluster are mistaken as genuine members of the cluster. In the previous study (Sunayama et al. 2020), we found that the projection effects cause the boost on the amplitudes of clustering and lensing on large scale compared to the expected amplitudes in the absence of any projection effects. These boosts are caused by preferential selections of filamentary structure aligned to the line-of-sight due to distance uncertainties in photometric surveys. We model the projection effects with two simple assumptions and develop a novel method to quantify the size of the boost using cluster-galaxy cross-correlation functions. We validate our method using mock cluster catalogs built from cosmological N-body simulations and find that we can obtain unbiased constraints on the boost parameter with our model. We then apply our analysis on the SDSS redMaPPer clusters and find that the size of the boost is roughly 20% for all the richness bins except the cluster sample with the richness bin $λ\in [30,40]$. This is the first study to constrain the boost parameter independent from cluster cosmology studies and provides a self-consistency test for the projection effects.
