Comparison of hydrostatic and lensing cluster mass estimates:a pilot study in MACS J0647.7+7015

TL;DR

This study compares hydrostatic and lensing mass estimates of galaxy cluster MACS J0647.7+7015, highlighting the importance of combining multiple observational methods to reduce systematic uncertainties in cosmological analyses.

Contribution

It demonstrates the potential of integrating high-resolution SZ, X-ray, and lensing data to identify and correct systematic effects in cluster mass measurements.

Findings

Significant variation in mass estimates depending on the observable and modeling.

Systematic effects can impact cosmological constraints derived from clusters.

Combining multiple data types can improve mass estimate accuracy.

Abstract

The detailed characterization of scaling laws relating the observables of cluster of galaxies to their mass is crucial for obtaining accurate cosmological constraints with clusters. In this paper, we present a comparison between the hydrostatic and lensing mass profiles of the cluster \psz\ at $z=0.59$. The hydrostatic mass profile is obtained from the combination of high resolution NIKA2 thermal Sunyaev-Zel'dovich (tSZ) and \xmm\ X-ray observations of the cluster. Instead, the lensing mass profile is obtained from an analysis of the CLASH lensing data based on the lensing convergence map. We find significant variation on the cluster mass estimate depending on the observable, the modelling of the data and the knowledge of the cluster dynamical state. This {\bf might} lead to significant systematic effects on cluster cosmological analyses for which only a single observable is generally used. From this pilot study, we conclude that the combination of high resolution SZ, X-ray and lensing data could allow us to identify and correct for these systematic effects. This would constitute a very interesting extension of the NIKA2 SZ Large Program.