Cluster cosmology with anisotropic boosts: Validation of a novel forward modeling analysis and application on SDSS redMaPPer clusters

Abstract

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 the SDSS redMaPPer clusters, and find results favoring low ${\Omega }_{\mathrm{m}}$ and high ${\sigma }_8$, combining to yield the lensing strength constraint $S_8=0.718_{-0.021}^{+0.024}$. 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.

v1: 19 pages, 14 figures. Comments welcome. v2: Added clarifications in text and reflected a minor bug fix for Section 3; version submitted to MNRAS. v3: version accepted and published at MNRAS

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Cited by in corpus (9)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Observational constraints of an anisotropic boost due to the projection effects using redMaPPer clusters
• Self-calibrating optical galaxy cluster selection bias using cluster, galaxy, and shear cross-correlations
• AMICO galaxy clusters in KiDS-1000: cosmological constraints and mass calibration from counts and weak lensing
• Satellite Content and Halo Mass of Galaxy Clusters: Comparison between Red-Sequence and Halo-based Optical Cluster Finders
• On the tomographic cluster clustering as a cosmological probe
• Selection Function of Clusters in Dark Energy Survey Year 3 Data from Cross-Matching with South Pole Telescope Detections
• Towards including super-sample covariance in the unbinned likelihood for cluster abundance cosmology
• AMICO galaxy clusters in KiDS-1000: Splashback radius from weak lensing and cluster-galaxy correlation function