Basu-Zych, Antara R. and Gonçalves, Thiago S. and Overzier, Roderik and Law, David R. and Schiminovich, David and Heckman, Tim and Martin, Chris and Wyder, Ted and O’Dowd, Matt (2009) An OSIRIS Study of the Gas Kinematics in a Sample of UV-Selected Galaxies: Evidence of "Hot and Bothered" Starbursts in the Local Universe. Astrophysical Journal Letters, 699 (2). L118-L124. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20090806-105424327
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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_☉ 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.
|Additional Information:||© 2009. The American Astronomical Society. Received 2008 December 19; accepted 2009 May 29; published 2009 June 22. We thank the referee for helpful and insightful comments. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community.We are most fortunate to have the opportunity to conduct observations from thismountain. A.R.B. gratefully recognizes Dr. Jacqueline van Gorkom for her advice.|
|Subject Keywords:||galaxies: interactions galaxies: kinematics and dynamics galaxies: starburst ultraviolet: galaxies|
|Official Citation:||An OSIRIS Study of the Gas Kinematics in a Sample of UV-Selected Galaxies: Evidence of "Hot and Bothered" Starbursts in the Local Universe Antara R. Basu-Zych, Thiago S. Gonçalves, Roderik Overzier, David R. Law, David Schiminovich, Tim Heckman, Chris Martin, Ted Wyder, and Matt O'Dowd 2009 ApJ 699 L118-L124 doi: 10.1088/0004-637X/699/2/L118|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||01 Sep 2009 22:38|
|Last Modified:||26 Dec 2012 11:09|
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