091459

Sunyaev-Zel.dovich (SZ) surveys are currently the most powerful and consistent method of detecting high mass high redshift galaxy clusters whose dynamic thermodynamic and chemical properties serve as unique probes of the composition and growth of structure in our Universe. The Atacama Cosmlogy Telescope (ACT) has surveyed and amp amp amp gt 13000 sq. deg of sky and the resulting ACTPol survey has detected thousands of clusters (hundreds at z and amp amp amp gt 1) based on their SZ signal. This proposal targets the most massive high-z ACTPol clusters without X-ray follow-up allowing us to obtain detailed measurements of cluster masses morphologies and thermodynamic properties while nearly doubling the number of X-ray observed clusters in this redshift range for which these measurement are possible. [truncated! Please see actual data for full text]