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We present a simple set of kinematic criteria that can distinguish betweengalaxies dominated by ordered rotational motion and those involved in majormerger events. Our criteria are based on the dynamics of the warm ionized gas(as traced by H-alpha) within galaxies, making this analysis accessible tohigh-redshift systems, whose kinematics are primarily traceable throughemission features. Using the method of kinemetry (developed by Krajnovic andco-workers), we quantify asymmetries in both the velocity and velocitydispersion maps of the warm gas, and the resulting criteria enable us toempirically differentiate between non-merging and merging systems at highredshift. We apply these criteria to 11 of our best-studied rest-frameUV/optical-selected z~2 galaxies for which we have near infrared integral fieldspectroscopic data from SINFONI on the VLT. Of these 11 systems, we find that>50% have kinematics consistent with a single rotating disk interpretation,while the remaining systems are more likely undergoing major mergers. Thisresult, combined with the short formation timescales of these systems, providesevidence that rapid, smooth accretion of gas plays a significant role in galaxyformation at high redshift.

Kinemetry of SINS High-Redshift Star-Forming Galaxies: Distinguishing Rotating Disks from Major Mergers