CCCP and MENeaCS: (updated) weak-lensing masses for 100 galaxy clusters

TL;DR

This paper improves weak-lensing mass measurements for 100 galaxy clusters using updated data and methods, providing more accurate calibrations for cosmological studies and analyzing mass biases and gas fractions.

Contribution

It presents new weak-lensing mass estimates for 48 clusters and reevaluates 52 from previous surveys with reduced systematic uncertainties, enhancing cluster mass calibration.

Findings

Systematic uncertainty in lensing signal below 5%

Bias in Planck masses of 0.84 ± 0.04

Gas fraction of 0.139 ± 0.014 in relaxed clusters

Abstract

Large area surveys have detected significant samples of galaxy clusters that can be used to constrain cosmological parameters, provided that the masses of the clusters are measured robustly. To improve the calibration of cluster masses using weak gravitational lensing we present new results for 48 clusters at $0.05<z<0.15$, observed as part of the Multi Epoch Nearby Cluster Survey (MENeaCS), and reevaluate the mass estimates for 52 clusters from the Canadian Cluster Comparison Project (CCCP). Updated high-fidelity photometric redshift catalogues of reference deep fields are used in combination with advances in shape measurements and state-of-the-art cluster simulations, yielding an average systematic uncertainty in the lensing signal below 5%, similar to the statistical uncertainty for our cluster sample. We derive a scaling relation with Planck measurements for the full sample and find a bias in the Planck masses of $1-b=0.84 \pm 0.04$. We find no statistically significant trend of the mass bias with redshift or cluster mass, but find that different selections could change the bias by up to 1.5$\sigma$. We find a gas fraction of $0.139 \pm 0.014$ for 8 relaxed clusters in our sample, which can also be used to infer cosmological parameters.