Measuring weak lensing masses on individual clusters

TL;DR

This paper estimates weak lensing masses for 458 galaxy clusters from SDSS using Hyper Suprime-Cam data, constrains the mass-richness relation, and compares results with DES Y1 findings, revealing some tension.

Contribution

Develops a rapid method to estimate cluster masses from weak lensing shear and applies it to a large SDSS cluster sample.

Findings

Mass-richness relation slope shows tension with DES Y1 for $\\lambda>20$

Results are consistent with DES Y1 for $\\lambda>40$

Provides weak lensing mass estimates for a large cluster sample

Abstract

We present weak lensing mass estimates for a sample of 458 galaxy clusters from the redMaPPer Sloan Digital Sky Survey DR8 catalogue using Hyper Suprime-Cam weak lensing data. We develop a method to quickly estimate cluster masses from weak lensing shear and use this method to estimate weak lensing masses for each of the galaxy clusters in our sample. Subsequently, we constrain the mass-richness relation as well as the intrinsic scatter between the cluster richness and the measured weak lensing masses. When calculating the mass-richness relation for all clusters with a richness $\lambda>20$, we find a tension in the slope of the mass-richness relation with the Dark Energy Survey Year 1 stacked weak lensing analysis. For a reduced sample of clusters with a richness $\lambda>40$, our results are consistent with the Dark Energy Survey Year 1 analysis.