Dark Energy Survey Year 3 Results: Cosmological Constraints from Cluster Abundances, Weak Lensing, and Galaxy Clustering - INSPIRE

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Dark Energy Survey Year 3 Results: Cosmological Constraints from Cluster Abundances, Weak Lensing, and Galaxy Clustering

DES

Collaboration

•

T.M.C. Abbott
(
- Cerro-Tololo InterAmerican Obs.
)

Mar 17, 2025

e-Print:

2503.13632 [astro-ph.CO]

Report number:

DES-2025-0885,
FERMILAB-PUB-25-0115-PPD

View in:

ADS Abstract Service

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Abstract: (arXiv)

Galaxy clusters provide a unique probe of the late-time cosmic structure and serve as a powerful independent test of the

\Lambda

CDM model. This work presents the first set of cosmological constraints derived with ~16,000 optically selected redMaPPer clusters across nearly 5,000

\rm{deg}^2

using DES Year 3 data sets. Our analysis leverages a consistent modeling framework for galaxy cluster cosmology and DES-Y3 joint analyses of galaxy clustering and weak lensing (3x2pt), ensuring direct comparability with the DES-Y3 3x2pt analysis. We obtain constraints of

S_8 = 0.864 \pm 0.035

and

\Omega_{\rm{m}} = 0.265^{+0.019}_{-0.031}

from the cluster-based data vector. We find that cluster constraints and 3x2pt constraints are consistent under the

\Lambda

CDM model with a Posterior Predictive Distribution (PPD) value of

0.53

. The consistency between clusters and 3x2pt provides a stringent test of

\Lambda

CDM across different mass and spatial scales. Jointly analyzing clusters with 3x2pt further improves cosmological constraints, yielding

S_8 = 0.811^{+0.022}_{-0.020}

and

\Omega_{\rm{m}} = 0.294^{+0.022}_{-0.033}

, a

24\%

improvement in the

\Omega_{\rm{m}}-S_8

figure-of-merit over 3x2pt alone. Moreover, we find no significant deviation from the Planck CMB constraints with a probability to exceed (PTE) value of

0.6

, significantly reducing previous

S_8

tension claims. Finally, combining DES 3x2pt, DES clusters, and Planck CMB places an upper limit on the sum of neutrino masses of

\sum m_\nu < 0.26

eV at 95% confidence under the

\Lambda

CDM model. These results establish optically selected clusters as a key cosmological probe and pave the way for cluster-based analyses in upcoming Stage-IV surveys such as LSST, Euclid, and Roman.

Note:

To be submitted. Comments welcome. redMaPPer catalog will be released at https://des.ncsa.illinois.edu/releases/y3a2/Y3key-cluster on 3/19

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