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We study the environmental dependence of color, stellar mass, and morphologyby comparing galaxies in a forming cluster to those in the field at z = 1:6with Hubble Space Telescope near-infrared imaging in the CANDELS/UDS field. Wequantify the morphology of the galaxies using the effective radius, reff, andS\'ersic index, n. In both the cluster and field, approximately half of thebulge-dominated galaxies (n > 2) reside on the red sequence of thecolor-magnitude diagram, and most disk-dominated galaxies (n < 2) have colorsexpected for star-forming galaxies. There is weak evidence that clustergalaxies have redder rest-frame U - B colors and higher stellar masses comparedto the field. Star-forming galaxies in both the cluster and field show nosignificant differences in their morphologies. In contrast, there is evidencethat quiescent galaxies in the cluster have larger median effective radii andsmaller S\'ersic indices compared to the field with a significance of 2?. Thesedifferences are most pronounced for galaxies at clustercentric distances 1 Mpc< Rproj < 1.5 Mpc, which have low S\'ersic indices and possibly largereffective radii, more consistent with star-forming galaxies at this epoch andin contrast to other quiescent galaxies. We argue that star-forming galaxiesare processed under the influence of the cluster environment at distancesgreater than the cluster-halo virial radius. Our results are consistent withmodels where gas accretion onto these galaxies is suppressed from processesassociated with the cluster environment.

CANDELS Observations of the Environmental Dependence of the Color-Mass-Morphology Relation at z = 1.6