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We present deep and high-resolution HST/NIC2 F160W imaging at 1.6micron ofsix z~2 star-forming galaxies with existing near-IR integral field spectroscopyfrom SINFONI at the VLT. The unique combination of rest-frame optical imagingand nebular emission-line maps provides simultaneous insight into morphologiesand dynamical properties. The overall rest-frame optical emission of thegalaxies is characterized by shallow profiles in general (Sersic index n<1),with median effective radii of ~5kpc. The morphologies are significantly clumpyand irregular, which we quantify through a non-parametric morphologicalapproach, estimating the Gini (G), Multiplicity (Psi), and M_20 coefficients.The strength of the rest-frame optical emission lines in the F160W bandpassindicates that the observed structure is not dominated by the morphology ofline-emitting gas, and must reflect the underlying stellar mass distribution ofthe galaxies. The sizes and structural parameters in the rest-frame opticalcontinuum and Halpha emission reveal no significant differences, suggestingsimilar global distributions of the on-going star formation and more evolvedstellar population. While no strong correlations are observed between stellarpopulation parameters and morphology within the NIC2/SINFONI sample itself, aconsideration of the sample in the context of a broader range of z~2 galaxytypes indicates that these galaxies probe the high specific star formation rateand low stellar mass surface density part of the massive z~2 galaxy population,with correspondingly large effective radii, low Sersic indices, low G, and highPsi and M_20. The combined NIC2 and SINFONI dataset yields insights ofunprecedented detail into the nature of mass accretion at high redshift.[Abridged]

Constraints on the Assembly and Dynamics of Galaxies: I. Detailed Rest-frame Optical Morphologies on Kiloparsec-scale of z ~ 2 Star-forming Galaxies