2013ApJ...767L..17G
A Redline Starburst: CO(2-1) Observations of an Eddington-limited Galaxy Reveal Star Formation at Its Most Extreme
Geach, J. E. ( Department of Physics, McGill University, Montréal, Québec, Canada ); Hickox, R. C. ( Department of Physics and Astronomy, Dartmouth College, Hanover, NH 03755, USA ); Diamond-Stanic, A. M. ( Center for Astrophysics and Space Sciences, University of California, San Diego, La Jolla, CA 92093, USA ); Krips, M. ( Institut de Radioastronomie Millimétrique, 300 rue de la Piscine, F-38406 Saint Martin d'Hères, France ); Moustakas, J. ( Department of Physics and Astronomy, Siena College, 515 Loudon Road, Loudonville, NY 12211, USA ); Tremonti, C. A. ( Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706, USA ); Coil, A. L. ( Center for Astrophysics and Space Sciences, University of California, San Diego, La Jolla, CA 92093, USA ); Sell, P. H. ( Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706, USA ); Rudnick, G. H. ( Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA ) show affiliations
The Astrophysical Journal Letters, Volume 767, Issue 1, article id. L17, 5 pp. (2013).
Published in Apr 2013
We report observations of the CO(2-1) emission of SDSS J1506+54, a compact (r e ≈ 135 pc) starburst galaxy at z = 0.6. SDSS J1506+54 appears to be forming stars close to the limit allowed by stellar radiation pressure feedback models: the measured L_IR/L^{\prime }_CO\approx 1500 is one of the highest measured for any galaxy. With its compact optical morphology but extended low surface brightness envelope, post-starburst spectral features, high infrared luminosity (L IR > 1012.5 L ), low gas fraction (M_H_2/M_\star \approx 15%), and short gas depletion time (tens of Myr), we speculate that this is a feedback-limited central starburst episode at the conclusion of a major merger. Taken as such, SDSS J1504+54 epitomizes the brief closing stage of a classic model of galaxy growth: we are witnessing a key component of spheroid formation during what we term a "redline" starburst.
Keywords:
Free Keywords: Astrophysics - Cosmology and Extragalactic Astrophysics; galaxies: evolution; galaxies: formation; galaxies: starburst
Astronomy: galaxies: evolution; galaxies: formation; galaxies: starburst
arXiv: Astrophysics - Cosmology and Extragalactic Astrophysics
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