First lensing measurements of SZ-detected clusters

We present the first lensing mass measurements of Sunyaev-Ze l’dovich (SZ) selected clusters. Using optical imaging from the Southern Cosmology Survey (SCS), we present weak lensing masses for three clusters selected by their SZ emission in the South Pole Telescope survey (SPT). We confirm that the SZ selection procedure is successf ul in detecting mass concentrations. We also study the weak lensing signals from 38 optically-selected clusters in ≃ 8 square degrees of the SCS survey. We fit Navarro, Frenk and White (NFW) profiles and find that the SZ clusters have amongst the largest masses, as high as 5×10 14 M⊙. Using the best fit masses for all the clusters, we analytically calculate the expecte d SZ integrated Y parameter, which we find to be consistent with the SPT observations.