A weak lensing analysis of the PLCK G100.2-30.4 cluster

TL;DR

This paper presents a weak lensing analysis of the galaxy cluster PLCK G100.2-30.4, estimating its mass and comparing it with X-ray data, confirming the consistency of different measurement methods.

Contribution

The study provides a detailed weak lensing mass estimate of the cluster and validates it against X-ray measurements, demonstrating the reliability of weak lensing in cluster mass determination.

Findings

Weak lensing mass estimate: M_500 ~ 7 x 10^14 M_sun

Mass profiles agree within 1σ with X-ray derived profiles

Bias factor (1-b) ~ 0.8 ± 0.1, consistent with Planck calibration

Abstract

We present a mass estimate of the Planck-discovered cluster PLCK G100.2-30.4, derived from a weak lensing analysis of deep SUBARU griz images. We perform a careful selection of the background galaxies using the multi-band imaging data, and undertake the weak lensing analysis on the deep (1hr) r-band image. The shape measurement is based on the KSB algorithm; we adopt the PSFex software to model the Point Spread Function (PSF) across the field and correct for this in the shape measurement. The weak lensing analysis is validated through extensive image simulations. We compare the resulting weak lensing mass profile and total mass estimate to those obtained from our re-analysis of XMM-Newton observations, derived under the hypothesis of hydrostatic equilibrium. The total integrated mass profiles are in remarkably good agreement, agreeing within 1$\sigma$ across their common radial range. A mass $M_{500} \sim 7 \times 10^{14} M_\odot$ is derived for the cluster from our weak lensing analysis. Comparing this value to that obtained from our reanalysis of XMM-Newton data, we obtain a bias factor of (1-b) = 0.8 $\pm$ 0.1. This is compatible within 1$\sigma$ with the value of (1-b) obtained by Planck Collaboration XXIV from their calibration of the bias factor using newly-available weak lensing reconstructed masses.