Shapiro, Kristen L. and Genzel, Reinhard and Schreiber, Natascha M. Förster and Tacconi, Linda J. and Bouché, Nicolas and Cresci, Giovanni and Davies, Richard and Eisenhauer, Frank and Johansson, Peter H. and Krajnović, Davor and Lutz, Dieter and Naab, Thorsten and Arimoto, Nobuo and Arribas, Santiago and Cimatti, Andrea and Colina, Luis and Daddi, Emanuele and Daigle, Olivier and Erb, Dawn and Hernandez, Olivier and Kong, Xu and Mignoli, Marco and Onodera, Masato and Renzini, Alvio and Shapley, Alice and Steidel, Charles (2008) Kinemetry of SINS high-redshift star-forming galaxies : distinguishing rotating disks from major mergers. Astrophysical Journal, 682 (1). pp. 231-251. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20090428-075610786
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We present a simple set of kinematic criteria that can distinguish between galaxies dominated by ordered rotational motion and those involved in major merger events. Our criteria are based on the dynamics of the warm ionized gas (as traced by Hα) within galaxies, making this analysis accessible to high-redshift systems, whose kinematics are primarily traceable through emission features. Using the method of kinemetry (developed by Krajnović and coworkers), we quantify asymmetries in both the velocity and velocity dispersion maps of the warm gas, and the resulting criteria enable us to empirically differentiate between nonmerging and merging systems at high redshift. We apply these criteria to 11 of our best-studied rest-frame UV/optical-selected z ~ 2 galaxies for which we have near-infrared integral-field spectroscopic 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. This result, combined with the short formation timescales of these systems, provides evidence that rapid, smooth accretion of gas plays a significant role in galaxy formation at high redshift.
|Additional Information:||© 2008 The American Astronomical Society. Received 2007 November 16; accepted 2008 February 5. We are very grateful to the entire SINS team, whose input greatly improved the quality of this work. We also thank Carl Heiles for many useful discussions and the anonymous referee for helpful comments. N. M. F. S. acknowledges support by the Schwerpunkt Programm SPP1177 of the Deutsche Forschungsgemeinschaft. N. A. acknowledges support from a Grant-in-Aid for Scientific Research (19540245) by the Japanese Ministry of Education, Culture, Sports, and Science. S. A. and L. C. have been supported by the Spanish Ministry for Education and Science under grants PNE2005-01480 and ESP2007- 65475-C02-01.|
|Subject Keywords:||galaxies: evolution; galaxies: high-redshift; galaxies: interactions; galaxies: kinematics and dynamics; methods: data analysis; techniques: spectroscopic|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||07 Aug 2009 20:44|
|Last Modified:||26 Dec 2012 10:58|
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