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We discuss the structural and morphological properties of galaxies in az=1.62 proto-cluster using near-IR imaging data from Hubble Space TelescopeWide Field Camera 3 data of the Cosmic Assembly Near-IR Deep ExtragalacticLegacy Survey (CANDELS). The cluster galaxies exhibit a clear color-morphologyrelation: galaxies with colors of quiescent stellar populations generally havemorphologies consistent with spheroids, and galaxies with colors consistentwith ongoing star formation have disk-like and irregular morphologies. The sizedistribution of the quiescent cluster galaxies shows a deficit of compact (<1kpc), massive galaxies compared to CANDELS field galaxies at z=1.6. As aresult the cluster quiescent galaxies have larger average effective sizescompared to field galaxies at fixed mass at greater than 90% significance.Combined with data from the literature, the size evolution of quiescent clustergalaxies is relatively slow from z~1.6 to the present, growing as(1+z)^(-0.6+/-0.1). If this result is generalizable, then it implies thatphysical processes associated with the denser cluster region seems to havecaused accelerated size growth in quiescent galaxies prior to z=1.6 and slowersubsequent growth at z<1.6 compared to galaxies in the lower density field. Thequiescent cluster galaxies at z=1.6 have higher ellipticities compared to lowerredshift samples at fixed mass, and their surface-brightness profiles suggestthat they contain extended stellar disks. We argue the cluster galaxies requiredissipationless (i.e., gas-poor or "dry") mergers to reorganize the diskmaterial and to match the relations for ellipticity, stellar mass, size, andcolor of early-type galaxies in z<1 clusters.

CANDELS Observations of the Structural Properties and Evolution of Galaxies in a Cluster at z=1.62