Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005assl..329p..80t&link_type=abstract
Starbursts: From 30 Doradus to Lyman Break Galaxies, Held in Cambridge, UK, 6-10 September 2004. Edited by R. de Grijs and R.M.
Astronomy and Astrophysics
Astrophysics
Scientific paper
The physical processes that govern star formation are not well understood. An open question is whether starbursts proceed until the gas supply is exhausted or whether supernova feedback serves to regulate bursts. We investigate this question by examining the kinematics of the neutral gas (as traced by the Na D interstellar absorption line) in galaxies that have experienced strong starbursts. We use the SDSS DR2 sample of over 200,000 galaxy spectra to select galaxies in various stages of a starburst. We use the Bruzual & Charlot (2003) models to subtract the stellar contribution to the Na D absorption line. We measure the residual equivalent width and the kinematic offset of the interstellar component. Of particular interest are the extreme post-burst or ``E+A'' galaxies. For these galaxies, we can age-date the burst to within a few 100 Myr using the stellar spectrum. With these data we are able to probe the temporal evolution of neutral gas in a starburst.
Heckman Tim
Kennicutt Rob
Tremonti Christy
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