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The kinematics of ionized gas in lyman-break analogs at z ~ 0.2

Gonçalves, Thiago S. and Basu-Zych, Antara and Overzier, Roderik and Martin, D. Christopher and Law, David R. and Schiminovich, David and Wyder, Ted K. and Mallery, Ryan and Rich, R. Michael and Heckman, Timothy H. (2010) The kinematics of ionized gas in lyman-break analogs at z ~ 0.2. Astrophysical Journal, 724 (2). pp. 1373-1388. ISSN 0004-637X.

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We present results for 19 “Lyman-break analogs” observed with Keck/OSIRIS with an adaptive-optics-assisted spatial resolution of less than 200 pc. We detect satellites/companions, diffuse emission, and velocity shear, all with high signal-to-noise ratios. These galaxies present remarkably high velocity dispersion along the line of sight (~70 km s^(−1)), much higher than standard star-forming spirals in the low-redshift universe. We artificially redshift our data to z ~ 2.2 to allow for a direct comparison with observations of high-z Lyman-break galaxies and find striking similarities between both samples. This suggests that either similar physical processes are responsible for their observed properties, or, alternatively, that it is very difficult to distinguish between different mechanisms operating in the low- versus high-redshift starburst galaxies based on the available data. The comparison between morphologies in the UV/optical continuum and our kinemetry analysis often shows that neither is by itself sufficient to confirm or completely rule out the contribution from recent merger events. We find a correlation between the kinematic properties and stellar mass, in that more massive galaxies show stronger evidence for a disk-like structure. This suggests a co-evolutionary process between the stellar mass buildup and the formation of morphological and dynamical substructure within the galaxy.

Item Type:Article
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URLURL TypeDescription
Martin, D. Christopher0000-0002-8650-1644
Law, David R.0000-0002-9402-186X
Rich, R. Michael0000-0003-0427-8387
Additional Information:© 2010 American Astronomical Society. Received 2010 July 16; accepted 2010 September 20; published 2010 November 12. The authors thank Jim Lyke, Al Conrad, Randy Campbell, and Hien Tran for invaluable assistance with the laser observations. We also thank the anonymous referee for useful comments regarding dynamical masses. T.S.G. thanks Brant Robertson for useful discussions concerning theoretical modeling of galaxy formation at z ~ 2. We also thank those of Hawaiian ancestry for hospitably allowing telescope operations on the summit of Mauna Kea.
Group:Space Astrophysics Laboratory
Subject Keywords:galaxies: evolution – galaxies: kinematics and dynamics – galaxies: starburst
Issue or Number:2
Classification Code:PACS: 98.54.Ep; 98.62.Py; 98.62.Dm; 98.62.Lv; 98.62.Bj; 98.62.Ai
Record Number:CaltechAUTHORS:20110111-114649643
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Official Citation:Thiago S. Gonçalves et al. 2010 ApJ 724 1373 doi: 10.1088/0004-637X/724/2/1373
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21703
Deposited By: Benjamin Perez
Deposited On:11 Jan 2011 22:21
Last Modified:09 Mar 2020 23:48

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