Dark Energy Survey Year 1 Results: Cosmological Constraints from Cluster Abundances, Weak Lensing, and Galaxy Correlations

TL;DR

This paper presents a joint analysis of multiple cosmic probes from DES Year 1 data, improving constraints on cosmological parameters and cluster properties by combining galaxy, lensing, and cluster data.

Contribution

It introduces the first combined analysis of cluster abundances and auto/cross correlations of three cosmic tracers from DES Year 1, enhancing cosmological constraints.

Findings

Consistent cosmological parameters with previous DES analyses.

Improved constraints on the cluster observable--mass relation.

Demonstrates the power of multi-probe analysis for future surveys.

Abstract

Combining multiple observational probes is a powerful technique to provide robust and precise constraints on cosmological parameters. In this letter, we present the first joint analysis of cluster abundances and auto/cross correlations of three cosmic tracer fields measured from the first year data of the Dark Energy Survey: galaxy density, weak gravitational lensing shear, and cluster density split by optical richness. From a joint analysis of cluster abundances, three cluster cross-correlations, and auto correlations of galaxy density, we obtain $\Omega_{\rm{m}}=0.305^{+0.055}_{-0.038}$ and $\sigma_8=0.783^{+0.064}_{-0.054}$. This result is consistent with constraints from the DES-Y1 galaxy clustering and weak lensing two-point correlation functions for the flat $\nu\Lambda$CDM model. We thus combine cluster abundances and all two-point correlations from three cosmic tracer fields 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 multi-probe analyses of upcoming wide imaging surveys.