THE SINS/zC-SINF SURVEY OF z similar to 2 GALAXY KINEMATICS: REST-FRAME MORPHOLOGY, STRUCTURE, AND COLORS FROM NEAR-INFRARED HUBBLE SPACE TELESCOPE IMAGING

Abstract

We present the analysis of Hubble Space Telescope (HST) J- and H-band imaging for 29 galaxies on the star-forming main sequence at z similar to 2, which have adaptive optics Very Large Telescope SINFONI integral field spectroscopy from our SINS/zC-SINF program. The SINFONI H alpha data resolve the ongoing star. formation and the ionized gas kinematics on scales of 1-2 kpc; the near-IR images trace the galaxies' rest-frame optical morphologies and distributions of stellar mass in old stellar populations at a similar resolution. The global light profiles of most galaxies show disk-like properties well described by a single Sersic profile with n similar to 1, with only similar to 15% requiring a high n > 3 Sersic index, all more massive than 10(10) M-circle dot. In bulge+disk fits, about 40% of galaxies have a measurable bulge component in the light profiles, with similar to 15% showing a substantial bulge-to-total ratio (B/T) B/T greater than or similar to 0.3. This is a lower limit to the frequency of z similar to 2 massive galaxies with a developed bulge component in stellar mass because it could be hidden by dust and/or outshined by a thick actively star-forming disk component. The galaxies' rest-optical half-light radii range between 1 and. 7 kpc, with a median of 2.1 kpc, and lie slightly above the size-mass relation at these epochs reported in the literature. This is attributed to differences in sample selection and definitions of size and/or mass measurements. The (u - g)(rest) color gradient and scatter within individual z similar to 2 massive galaxies with greater than or similar to 10(11) M-circle dot are as high as in z = 0 low-mass, late-type galaxies. and are consistent with the high star. formation rates of massive z similar to 2 galaxies being sustained at large galactocentric distances.