%0 Journal Article
%T The SINS/zC-SINF survey of z~2 galaxy kinematics: evidence for gravitational quenching
%A R. Genzel
%A N. M. F£¿rster Schreiber
%A P. Lang
%A S. Tacchella
%A L. J. Tacconi
%A S. Wuyts
%A K. Bandara
%A A. Burkert
%A P. Buschkamp
%A C. M. Carollo
%A G. Cresci
%A R. Davies
%A F. Eisenhauer
%A E. K. S. Hicks
%A J. Kurk
%A S. J. Lilly
%A D. Lutz
%A C. Mancini
%A T. Naab
%A S. Newman
%A Y. Peng
%A A. Renzini
%A K. Shapiro Griffin
%A A. Sternberg
%A D. Vergani
%A E. Wisnioski
%A E. Wuyts
%A G. Zamorani
%J Physics
%D 2013
%I arXiv
%R 10.1088/0004-637X/785/1/75
%X As part of the SINS/zC-SINF surveys of high-z galaxy kinematics, we derive the radial distributions of H-alpha surface brightness, stellar mass surface density, and dynamical mass at ~2 kpc resolution in 19 z~2 star-forming disks with deep SINFONI AO spectroscopy at the ESO VLT. From these data we infer the radial distribution of the Toomre Q-parameter for these main-sequence star forming galaxies (SFGs), covering almost two decades of stellar mass (10^9.6 to 10^11.5 solar masses). In more than half of our SFGs, the H-alpha distributions cannot be fit by a centrally peaked distribution, such as an exponential, but are better described by a ring, or the combination of a ring and an exponential. At the same time the kinematic data indicate the presence of a mass distribution more centrally concentrated than a single exponential distribution for 5 of the 19 galaxies. The resulting Q-distributions are centrally peaked for all, and significantly exceed unity there for three quarters of the SFGs. The occurrence of H-alpha rings and of large nuclear Q-values is strongly correlated, and is more common for the more massive SFGs. While our sample is small and there remain substantial uncertainties and caveats, our observations are consistent with a scenario in which cloud fragmentation and global star formation are secularly suppressed in gas rich high-z disks from the inside out, as the central stellar mass density of the disks grows.
%U http://arxiv.org/abs/1310.3838v1