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We present the KMOS 3D survey, a new integral field survey of over 600 galaxies at 0.7 1, implying that the star-forming 'main sequence' (MS) is primarily composed of rotating galaxies at both redshift regimes. When considering additional stricter criteria, the H kinematic maps indicate at least 70% of the resolved galaxies are disk-like systems. Our high-quality KMOS data confirm the elevated velocity dispersions reported in previous IFS studies at z 0.7. For rotation-dominated disks, the average intrinsic velocity dispersion decreases by a factor of two from 50 km s -1 at z 2.3 to 25 km s -1 at z 0.9. Combined with existing results spanning z 0 -3, we show that disk velocity dispersions follow an evolution that is consistent with the dependence of velocity dispersion on gas fractions predicted by marginally-stable disk theory.
Wisnioski et al. (Fri,) studied this question.