Cosmological constraints from abundance, weak-lensing and clustering of galaxy clusters: application to the SDSS
arXiv (Cornell University)(2023)
摘要
The clustering of galaxy clusters is a powerful cosmological tool, which can
help to break degeneracies between parameters when combined with other
cosmological observables. We aim to demonstrate its potential in constraining
cosmological parameters and scaling relations when combined with cluster counts
and weak lensing mass information, using as a case study the redMaPPer cluster
catalog derived from the Sloan Digital Sky Survey (SDSS). We extend the
analysis of number counts and weak lensing signal performed by Costanzi et al.
2019a, with the addition of the real-space 2-point correlation function. We
derive cosmological and scaling relation posteriors for all the possible
combinations of the three observables to assess their constraining power,
parameter degeneracies, and possible internal tensions. We find no evidence for
tensions between the three data set analyzed. We demonstrate that the inclusion
of the cluster clustering statistic can greatly enhance the constraining power
of the sample thanks to its capability of breaking the Ω_ m -
σ_8 degeneracy characteristic of cluster abundance studies. In
particular, for a flat ΛCDM model with massive neutrinos, we obtain
Ω_ m=0.28 ± 0.03 and σ_8 = 0.82 ± 0.05, a 33
improvement compared to the posteriors derived combining cluster abundance and
weak lensing analyses. Our results are consistent with cosmological posteriors
from other cluster surveys, as well as with Planck CMB results and DES-Y3
galaxy clustering and weak-lensing analysis.
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关键词
galaxy clusters,cosmological constraints,abundance,clustering,weak-lensing
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