The NIKA2 Sunyaev-Zeldovich Large Program

TL;DR

The NIKA2 SZ Large Program conducts high-resolution mapping of 45 galaxy clusters to study their pressure profiles and scaling laws, enhancing understanding of cluster physics and mass estimation across a broad redshift and mass range.

Contribution

This study provides the first high-angular resolution SZ maps for a representative sample of galaxy clusters spanning higher redshifts and lower masses than previous samples.

Findings

Measurement of average ICM pressure profiles up to R500.

Estimation of SZ observable-mass scaling laws.

Integrated analysis with multi-wavelength data for cluster physics.

Abstract

The NIKA2 Guaranteed-Time SZ Large Program (LPSZ) is dedicated to the high-angular resolution SZ mapping of a representative sample of 45 SZ-selected galaxy clusters drawn from the catalogues of the Planck satellite, or of the Atacama Cosmology Telescope. The LPSZ sample spans a mass range from $3$ to $11 \times 10^{14} M_{\odot}$ and a redshift range from $0.5$ to $0.9$, extending to higher redshift and lower mass the previous samples dedicated to the cluster mass calibration and universal properties estimation. The main goals of the LPSZ are the measurement of the average radial profile of the ICM pressure up to $R_{500}$ by combining NIKA2 with Planck or ACT data, and the estimation of the scaling law between the SZ observable and the mass using NIKA2, XMM-Newton and Planck/ACT data. Furthermore, combining LPSZ data with existing or forthcoming public data in lensing, optical/NIR or radio domains, we will build a consistent picture of the cluster physics and further gain knowledge on the mass estimate as a function of the cluster morphology and dynamical state.