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We present an initial study of the mass and evolutionary state of a massiveand distant cluster, RCS2 J232727.6-020437. This cluster, at z=0.6986, is therichest cluster discovered in the RCS2 project. The mass measurements presentedin this paper are derived from all possible mass proxies: X-ray measurements,weak-lensing shear, strong lensing, Sunyaev Zel'dovich effect decrement, thevelocity distribution of cluster member galaxies, and galaxy richness. Whileeach of these observables probe the mass of the cluster at a different radius,they all indicate that RCS2 J232727.6-020437 is among the most massive clustersat this redshift, with an estimated mass of M_200 ~3 x10^15 h^-1 Msun. In thispaper, we demonstrate that the various observables are all reasonablyconsistent with each other to within their uncertainties. RCS2 J232727.6-020437appears to be well relaxed -- with circular and concentric X-ray isophotes,with a cool core, and no indication of significant substructure in extensivegalaxy velocity data.

A Multi-Wavelength Mass Analysis of RCS2 J232727.6-020437, a ~3x10$^{15}$M$_{\odot}$ Galaxy Cluster at z=0.7