Dark Energy Survey Year 1 Results: Cosmological constraints from cluster abundances and weak lensing

2020/02/25 by T. M. C. Abbott, DES Collaboration, Tim Abbott +217 · 4 citations
Physics and Astronomy · #Anisotropy #Astrophysics #Baryon acoustic oscillations #Cluster (spacecraft) #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark energy #Dark matter #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Gamma-ray bursts and supernovae #Photometric redshift #Physics #Planck #Redshift #Weak gravitational lensing #astro-ph.CO

paper · pdf · doi:10.1103/physrevd.102.023509

published as Phys. Rev. D 102, 023509 (2020) · 35 pages, 20 figures, submitted to Physical Review D

arxiv created 2020/02/25 · openalex created_date 2020/03/06 · openalex publication_date 2020/07/07 · arxiv updated 2020/07/15 · openalex updated_date 2026/08/06

Abstract

We perform a joint analysis of the counts and weak lensing signal of redMaPPer clusters selected from the Dark Energy Survey (DES) Year 1 dataset. Our analysis uses the same shear and source photometric redshifts estimates as were used in the DES combined probes analysis. Our analysis results in surprisingly low values for S₈=\ensuremathσ₈(\mathrm\ensuremathΩ_m/0.3)^0.5=0.65\ifmmode±\else\textpm\fi0.04, driven by a low matter density parameter, \mathrm\ensuremathΩ_m=\phantom\rule0ex0ex0.179_\ensuremath-0.038^+0.031, with \ensuremathσ₈\ensuremath-\mathrm\ensuremathΩ_m posteriors in 2.4\ensuremathσ tension with the DES Y1 3x2pt results, and in 5.6\ensuremathσ with the Planck CMB analysis. These results include the impact of post-unblinding changes to the analysis, which did not improve the level of consistency with other data sets compared to the results obtained at the unblinding. The fact that multiple cosmological probes (supernovae, baryon acoustic oscillations, cosmic shear, galaxy clustering and CMB anisotropies), and other galaxy cluster analyses all favor significantly higher matter densities suggests the presence of systematic errors in the data or an incomplete modeling of the relevant physics. Cross checks with x-ray and microwave data, as well as independent constraints on the observable-mass relation from Sunyaev-Zeldovich selected clusters, suggest that the discrepancy resides in our modeling of the weak lensing signal rather than the cluster abundance. Repeating our analysis using a higher richness threshold (\ensuremathλ\ensuremath≥30) significantly reduces the tension with other probes, and points to one or more richness-dependent effects not captured by our model.

Citations

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• The DES Bright Arcs Survey: Candidate Strongly Lensed Galaxy Systems from the Dark Energy Survey 5,000 Sq. Deg. Footprint
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• Cosmological constraints from DES Y1 cluster abundances and SPT multiwavelength data
• Cannibalism hinders growth: Cannibal Dark Matter and the S8 tension