Flat rotation curves and low velocity dispersions in KMOS star-forming
  galaxies at z~1
  The study of the evolution of star-forming galaxies requires the
determination of accurate kinematics and scaling relations out to high
redshift. In this paper we select a sample of 18 galaxies at z~1, observed in
the H-alpha emission-line with KMOS, to derive accurate kinematics using a
novel 3D analysis technique. We use the new code 3D-Barolo, that models the
galaxy emission directly in the 3D observational space, without the need to
extract kinematic maps. This technique's major advantage is that it is not
affected by beam smearing and thus it enables the determination of rotation
velocity and intrinsic velocity dispersion, even at low spatial resolution. We
find that: 1) the rotation curves of these z~1 galaxies rise very steeply
within few kiloparsecs and remain flat out to the outermost radius and 2) the
H-alpha velocity dispersions are low, ranging from 15 to 40 km/s, which leads
to V/sigma = 3-10. These characteristics are similar to those of disc galaxies
in the local Universe. Finally, we also report no significant evolution of the
stellar-mass Tully-Fisher relation. Our results show that disc galaxies are
kinematically mature and rotation-dominated already at z~1.
