Title: The Most Massive Clusters of Galaxies in the Universe
Abstract: ESA's Planck Mission has provided a large, statistically representative sample of massive clusters, detected over the full sky through their SZ effect. Since the strength of the SZ signal is directly correlated with total cluster mass, the Planck detections provide a good estimate of the cluster mass. To better understand the growth of massive clusters, we are using Chandra observations of 165 Planck detected clusters at redshifts z<0.35 to determine cluster morphologies. I will show a comparison of the cluster morphologies in SZ selected samples compared to X-ray and optically selected samples. In addition, among these very massive systems are the HST Frontier Field clusters. For these we are combining deep X-ray, radio and optical/IR observations to better understand cluster mergers, the transformations of cluster galaxies, the generation of radio halos and relics, as well as to identify X-ray and radio AGN that are lensed by the cluster.