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 Cluster Lensing And Supernova survey with Hubble (CLASH). Based on UBVRIZ imaging from the Wide-Field Imager camera at the MPG/ESO 2.2-m telescope, we measure photometric redshifts and shapes of background galaxies. The cluster is detected as a mass peak at 5 Sigma significance. Its density can be parametrized as a Navarro-Frenk-White (NFW) profile with two free parameters, the mass M-200m = 33.1(-6.8)(+9.6) x 10(14) M-circle dot and concentration c(200m) = 2.6(-1.0)(+1.5). We discover a second cluster inside the field of view at a photometric redshift of z approximate to 0.6, with an NFW mass of M-200m = 4.0(-2.6)(+3.7) x 10(14) M-circle dot.