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Kathy Romer 39-Published-7.07.20.pdf (2.58 MB)

Dark Energy Survey year 1 results: cosmological constraints from cluster abundances and weak lensing

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journal contribution
posted on 2023-06-07, 07:40 authored by T M C Abbott, M Aguena, A Alarcon, S Allam, S Allen, J Annis, S Avila, D Bacon, Alberto Bermeo, Sunayana Bhargava, Paul GilesPaul Giles, Julian Mayers, Kathy RomerKathy Romer, Philip Rooney, Reese WilkinsonReese Wilkinson, DES Collaboration, others
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=s8(Om/0.3)0.5=0.65±0.04, driven by a low matter density parameter, Om=0.179+0.031-0.038, with s8-Om posteriors in 2.4s tension with the DES Y1 3x2pt results, and in 5.6s 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 (?=30) significantly reduces the tension with other probes, and points to one or more richness-dependent effects not captured by our model.

History

Publication status

  • Published

File Version

  • Published version

Journal

Physical Review D: Particles, Fields, Gravitation and Cosmology

ISSN

1550-7998

Publisher

American Physical Society

Issue

2

Volume

102

Page range

1-34

Article number

a023509

Pages

34.0

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2020-08-04

First Open Access (FOA) Date

2020-08-04

First Compliant Deposit (FCD) Date

2020-08-03

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