Compact, Dispersion-dominated, Star-forming Galaxies at z 2

Astronomy and Astrophysics – Astronomy

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Scientific paper

Using SINFONI/VLT AO IFU spectroscopy, we observe 13 star-forming, compact and dispersion-dominated z 2 galaxies. We find non-trivial velocity gradients in 11 of these galaxies, including those that appeared to have little rotation based on earlier seeing-limited data. In comparison to rotation-dominated disk-like galaxies from our sample at z 2, these dispersion-dominated systems are younger, more compact, more gas rich, and have lower dynamical masses and gas-phase metallicities. We also find that on average, the dispersion-dominated galaxies have a larger fraction of broad/narrow Ha emission due to star-formation driven winds. This broad emission is likely due to the larger star-formation surface densities of these systems. Indeed, we find a possible trend of increasing broad emission fraction with sigma-SFR, with a threshold sigma-SFR 1 Msol/yr/kpc2 (corresponding to a molecular gas surface density of 1000 Msol/pc2) for significant outflows.

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