Bayesian analysis of weak gravitational lensing and Sunyaev-Zel'dovich data for six galaxy clusters

TL;DR

This paper combines Bayesian analysis of Sunyaev-Zel'dovich and weak gravitational lensing data to accurately determine galaxy cluster properties, confirming previous findings and exploring complex cluster structures.

Contribution

It introduces a joint Bayesian framework for analyzing SZ and lensing data, including the first multi-component lensing analysis of A115 and detailed study of A1914 and A611.

Findings

Good agreement between SZ and lensing mass measurements

First multi-component weak-lensing analysis of A115

Confirmation of gas-mass separation in A1914

Abstract

We present an analysis of observations made with the Arcminute Microkelvin Imager (AMI) and the Canada-France-Hawaii Telescope (CFHT) of six galaxy clusters in a redshift range of 0.16--0.41. The cluster gas is modelled using the Sunyaev--Zel'dovich (SZ) data provided by AMI, while the total mass is modelled using the lensing data from the CFHT. In this paper, we: i) find very good agreement between SZ measurements (assuming large-scale virialisation and a gas-fraction prior) and lensing measurements of the total cluster masses out to r_200; ii) perform the first multiple-component weak-lensing analysis of A115; iii) confirm the unusual separation between the gas and mass components in A1914; iv) jointly analyse the SZ and lensing data for the relaxed cluster A611, confirming our use of a simulation-derived mass-temperature relation for parameterizing measurements of the SZ effect.