Dark Energy Survey Year 1 Results: cosmological constraints from cluster abundances, weak lensing, and galaxy correlations

DES Collaboration, B. Hoyle, S. Avila, D. Thomas

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Abstract

We present the first joint analysis of cluster abundances and auto or cross-correlations of three cosmic tracer fields: galaxy density, weak gravitational lensing shear, and cluster density split by optical richness. From a joint analysis (4×2pt+N) of cluster abundances, three cluster cross-correlations, and the auto correlations of the galaxy density measured from the first year data of the Dark Energy Survey, we obtain Ωm=0.305+0.055−0.038 and σ8=0.783+0.064−0.054. This result is consistent with constraints from the DES-Y1 galaxy clustering and weak lensing two-point correlation functions for the flat νΛCDM model. Consequently, we combine cluster abundances and all two-point correlations from across all three cosmic tracer fields (6×2pt+N) and find improved constraints on cosmological parameters as well as on the cluster observable-mass scaling relation. This analysis is an important advance in both optical cluster cosmology and multiprobe analyses of upcoming wide imaging surveys.
Original languageEnglish
Article number141301
Number of pages8
JournalPhysical Review Letters
Volume126
Issue number14
DOIs
Publication statusPublished - 6 Apr 2021

Keywords

  • RCUK
  • STFC

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