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We have used high-resolution, HST WFC3/IR, near-infrared imaging to conduct adetailed bulge-disk decomposition of the morphologies of ~200 of the mostmassive (M_star > 10^11 M_solar) galaxies at 1<z<3 in the CANDELS-UDS field. Wefind that, while such massive galaxies at low redshift are generallybulge-dominated, at redshifts 1<z<2 they are predominantly mixed bulge+disksystems, and by z>2 they are mostly disk-dominated. Interestingly, we find thatwhile most of the quiescent galaxies are bulge-dominated, a significantfraction (25-40%) of the most quiescent galaxies, have disk-dominatedmorphologies. Thus, our results suggest that the physical mechanisms whichquench star-formation activity are not simply connected to those responsiblefor the morphological transformation of massive galaxies.

The Morphologies of Massive Galaxies at 1 < z < 3 in the CANDELS-UDS Field