Tuesday

I will describe Integral Field Spectrocopic (IFS) dynamical measurements of 77 star-forming galaxies at z=3.5 in the mass range 9.5 lt log(M) gt 10.5 from the KMOS Deep Survey (KDS).
These measurements provide the highest redshift constraints for the internal dynamics, the intrinsic velocity dispersions and rotation velocities of typical star-forming galaxies.
Careful comparisons have been made to IFS samples spanning a wide redshift baseline in order to track dynamical evolution.
In particular, we observe a sample-averaged, beam smearing corrected intrinsic velocity dispersion of 70.8 kms-1, consistent with the increase of velocity dispersion with redshift reported up to z=3 in the comparison samples.
Only 34 percent of our galaxies are rotation-dominated as a result of the increase in velocity dispersions.
The rotation dominated KDS galaxies show no clear offset from the local rotation velocity-stellar mass relation, although a smaller fraction of the galaxies are on the relation due to the increase in the dispersion dominated fraction.
These observations are consistent with a simple equilibrium model picture, in which random motions are boosted in high-redshift galaxies by the increase in gas fractions, accretion efficiency, specific star-formation rate and stellar feedback.