# Combined analysis of galaxy cluster number count, thermal Sunyaev-Zel'dovich power spectrum, and bispectrum

## TL;DR

This paper combines galaxy cluster counts, thermal Sunyaev-Zel'dovich power spectrum, and bispectrum analyses to refine cosmological parameters and hydrostatic mass bias estimates, achieving results consistent with previous studies and simulations.

## Contribution

It introduces a comprehensive combined analysis of multiple SZ-related observables to improve constraints on cosmological parameters and mass bias.

## Key findings

- Derived $\sigma_8=0.79 \
- Omega_m=0.29 \
- Hydrostatic mass bias $(1-b)=0.71 \

## Abstract

The Sunyaev-Zel'dovich (SZ) effect is a powerful probe of the evolution of structures in the universe, and is thus highly sensitive to cosmological parameters $\sigma_8$ and $\Omega_m$, though its power is hampered by the current uncertainties on the cluster mass calibration. In this analysis we revisit constraints on these cosmological parameters as well as the hydrostatic mass bias, by performing (i) a robust estimation of the tSZ power-spectrum, (ii) a complete modeling and analysis of the tSZ bispectrum, and (iii) a combined analysis of galaxy clusters number count, tSZ power spectrum, and tSZ bispectrum. From this analysis, we derive as final constraints $\sigma_8 = 0.79 \pm 0.02$, $\Omega_{\rm m} = 0.29 \pm 0.02$, and $(1-b) = 0.71 \pm 0.07$. These results favour a high value for the hydrostatic mass bias compared to numerical simulations and weak-lensing based estimations. They are furthermore consistent with both previous tSZ analyses, CMB derived cosmological parameters, and ancillary estimations of the hydrostatic mass bias.