Systematic effects on the upcoming NIKA2 LPSZ scaling relation

TL;DR

This paper investigates the systematic effects influencing the scaling relation between cluster mass and Sunyaev-Zeldovich observable in the NIKA2 LPSZ program, emphasizing the importance of selection functions and noise characteristics.

Contribution

It introduces an analytical simulation approach to account for selection effects and noise in deriving the SZ scaling relation at intermediate to high redshift.

Findings

Selection function correction improves scaling relation accuracy.

White and correlated noises do not bias the relation estimation.

Simulation method effectively accounts for systematic effects.

Abstract

In cluster cosmology, cluster masses are the main parameter of interest. They are needed to constrain cosmological parameters through the cluster number count. As the mass is not an observable, a scaling relation is needed to link cluster masses to the integrated Compton parameters Y, i.e. the Sunyaev-Zeldovich observable (SZ). Planck cosmological results obtained with cluster number counts are based on a scaling relation measured with clusters at low redshift ($z$<0.5) observed in SZ and X-ray. In the SZ Large Program (LPSZ) of the NIKA2 collaboration, the scaling relation will be obtained with a sample of 38 clusters at intermediate to high redshift ($0.5<z<0.9$) and observed at high angular resolution in both SZ and X-ray. Thanks to analytical simulation of LPSZ-like samples, we take into account the LPSZ selection function and correct for its effects. Besides, we show that white and correlated noises in the SZ maps do not affect the scaling relation estimation.