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We analyze the spectra, spatial distributions and kinematics of Ha, [NII] and[SII] emission in a sample of 42, z~2.2 UV/optically selected star forminggalaxies (SFGs) from the SINS & zC-SINF surveys, 35 of which were observed inthe adaptive optics mode of SINFONI. This is supplemented by kinematic datafrom 48 z~1-2.5 galaxies from the literature. We find that the kinematicclassification of the high-z SFGs as `dispersion dominated' or `rotationdominated' correlates most strongly with their intrinsic sizes. Smallergalaxies are more likely `dispersion-dominated' for two main reasons: 1) Therotation velocity scales linearly with galaxy size but intrinsic velocitydispersion does not depend on size, and as such, their ratio is systematicallylower for smaller galaxies, and 2) Beam smearing strongly decreases large-scalevelocity gradients and increases observed dispersion much more for galaxieswith sizes at or below the resolution. Dispersion dominated SFGs may thus haveintrinsic properties similar to `rotation dominated' SFGs, but are primarilymore compact, lower mass, less metal enriched and may have higher gasfractions, plausibly because they represent an earlier evolutionary state.

The SINS/zC-SINF Survey of z~2 Galaxy Kinematics: The Nature of Dispersion Dominated Galaxies