Cluster cosmology with anisotropic boosts: validation of a novel forward modelling analysis and application on SDSS redMaPPer clusters
Cluster cosmology with anisotropic boosts: validation of a novel forward modelling analysis and application on SDSS redMaPPer clusters
复制标题
具有各向异性增强的星团宇宙学：新型正演模型分析的验证及其在 SDSS redMaPPer 星团上的应用
DOI：
10.1093/mnras/stac3410
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发表时间：
2022
影响因子：
4.8
通讯作者：
Sugiyama Sunao
中科院分区：
文献类型：
--
作者：
Park Youngsoo;Sunayama Tomomi;Takada Masahiro;Kobayashi Yosuke;Miyatake Hironao;More Surhud;Nishimichi Takahiro;Sugiyama Sunao
我们提出了一个新的分析集群宇宙学，完全向前模型的丰度，弱透镜，星系团的集群。我们的分析特别包括一个经验模型的各向异性的提升影响透镜和集群信号的光学集群。这些提升产生于各向异性大尺度结构包围的集群的优先选择，这是测光测量提供的视线闯入者和真正的集群成员之间的有限区分的结果。我们验证我们的分析，通过一个盲目的宇宙学挑战模拟，并发现，我们可以获得紧密和公正的宇宙学约束，没有信息先验或外部校准我们的任何模型参数。然后，我们将我们的分析应用于SDSSredMapPer集群，并发现有利于低Ω和高σ8的结果，结合产生透镜强度约束。我们通过一系列揭盲后测试调查了这些结果背后的潜在驱动因素，注意到我们的结果与现有的星团宇宙学约束一致，但与其他基于CMB/LSS的宇宙学结果明显不一致。从这些测试中，我们发现集群透镜信号的抑制可能会推动我们的结果。
We present a novel analysis for cluster cosmology that fully forward models the abundances, weak lensing, and the clustering of galaxy clusters. Our analysis notably includes an empirical model for the anisotropic boosts impacting the lensing and clustering signals of optical clusters. These boosts arise from a preferential selection of clusters surrounded by anisotropic large-scale structure, a consequence of the limited discrimination between line-of-sight interlopers and true cluster members offered by photometric surveys. We validate our analysis via a blind cosmology challenge on mocks, and find that we can obtain tight and unbiased cosmological constraints without informative priors or external calibrations on any of our model parameters. We then apply our analysis on theSDSSredMaPPer clusters, and find results favoring low Ωmand high σ8, combining to yield the lensing strength constraint. We investigate potential drivers behind these results through a series of post-unblinding tests, noting that our results are consistent with existing cluster cosmology constraints but clearly inconsistent with other CMB/LSS based cosmology results. From these tests, we find hints that a suppression in the cluster lensing signal may be driving our results.