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THE KMOS 3D SURVEY: DESIGN, FIRST RESULTS, AND THE EVOLUTION OF GALAXY KINEMATICS FROM 0.7 ⩽ z ⩽ 2.7

2015; IOP Publishing; Volume: 799; Issue: 2 Linguagem: Inglês

10.1088/0004-637x/799/2/209

1538-4357

Emily Wisnioski, N. M. Förster Schreiber, Stijn Wuyts, Eva Wuyts, K. Bandara, David J. Wilman, R. Genzel, R. Bender, R. Davies, Matteo Fossati, P. Lang, J. Trevor Mendel, A. Beifiori, Gabriel Brammer, J. Chan, Maximilian Fabricius, Yoshinobu Fudamoto, S. Kulkarni, J. Kurk, D. Lutz, Erica J. Nelson, Ivelina Momcheva, D. J. Rosario, R. P. Saglia, S. Seitz, L. J. Tacconi, Pieter van Dokkum,

Stellar, planetary, and galactic studies

We present the KMOS^3D survey, a new integral field survey of over 600 galaxies at 0.7<z 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 Halpha 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 at z~2.3 to 25 km/s at z~0.9 while the rotational velocities at the two redshifts are comparable. Combined with existing results spanning z~0-3, disk velocity dispersions follow an approximate (1+z) evolution that is consistent with the dependence of velocity dispersion on gas fractions predicted by marginally-stable disk theory.