Weak lensing analysis of RXC J2248.7-4431

TL;DR

This paper performs a weak lensing analysis of galaxy cluster RXC J2248.7-4431 using multi-band imaging, revealing its mass profile and discovering a second cluster at a different redshift.

Contribution

It provides the first weak lensing mass measurement of RXC J2248.7-4431 and identifies a secondary cluster within the field, enhancing understanding of its mass distribution.

Findings

Cluster detected at 5sigma significance

Mass profile fitted with NFW model

Second cluster identified at z~0.6

Abstract

We present a weak lensing analysis of the cluster of galaxies RXC J2248.7-4431, a massive system at z=0.3475 with prominent strong lensing features covered by the HST/CLASH survey (Postman et al. 2012). Based on UBVRIZ imaging from the WFI camera at the MPG/ESO-2.2m telescope, we measure photometric redshifts and shapes of background galaxies. The cluster is detected as a mass peak at 5sigma significance. Its density can be parametrised as an NFW profile (Navarro et al. 1996) with two free parameters, the mass M_200m=(33.1+9.6-6.8)x10^14Msol and concentration c_200m=2.6+1.5-1.0. We discover a second cluster inside the field of view at a photometric redshift of z~0.6, with an NFW mass of M_200m=(4.0+3.7-2.6)x10^14Msol.