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Title:
An OSIRIS Study of the Gas Kinematics in a Sample of UV-Selected Galaxies: Evidence of "Hot and Bothered" Starbursts in the Local Universe
Authors:
Basu-Zych, Antara R.; Gonçalves, Thiago S.; Overzier, Roderik; Law, David R.; Schiminovich, David; Heckman, Tim; Martin, Chris; Wyder, Ted; O'Dowd, Matt
Affiliation:
AA(Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027, USA ), AB(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125, USA ), AC(Max-Planck-Institut für Astrophysik, D-85748 Garching, Germany ), AD(Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA ; Hubble Fellow.; ), AE(Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027, USA ), AF(Center for Astrophysical Sciences, The Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218, USA ), AG(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125, USA ), AH(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125, USA ), AI(Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027, USA )
Publication:
The Astrophysical Journal Letters, Volume 699, Issue 2, pp. L118-L124 (2009). (ApJL Homepage)
Publication Date:
07/2009
Origin:
IOP
ApJ Keywords:
galaxies: interactions, galaxies: kinematics and dynamics, galaxies: starburst, ultraviolet: galaxies
DOI:
10.1088/0004-637X/699/2/L118
Bibliographic Code:
2009ApJ...699L.118B

Abstract

We present data from Integral Field Spectroscopy for three supercompact UV-Luminous Galaxies (ScUVLGs). As nearby (z ~ 0.2) compact (R 50 ~ 1-2 kpc) bright Paschen-α sources, with unusually high star formation rates (SFR = 3-100 M sun yr-1), ScUVLGs are an ideal population for studying detailed kinematics and dynamics in actively star-forming galaxies. In addition, ScUVLGs appear to be excellent analogs to high-redshift Lyman Break Galaxies (LBGs), and our results may offer additional insight into the dynamics of LBGs. Previous work by our team has shown that the morphologies of these galaxies exhibit tidal features and companions, and in this study we find that the dynamics of ScUVLGs are dominated by disturbed kinematics of the emission line gas—suggesting that these galaxies have undergone recent feedback, interactions, or mergers. While two of the three galaxies do display rotation, v/σ<1—suggesting dispersion-dominated kinematics rather than smooth rotation. We also simulate how these observations would appear at z ~ 2. Lower resolution and loss of low surface brightness features cause some apparent discrepancies between the low-z (observed) and high-z (simulated) interpretations and quantitatively gives different values for v/σ, yet simulations of these low-z analogs manage to detect the brightest regions well and resemble actual high-z observations of LBGs.
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