Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20911406h&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #114.06; Bulletin of the American Astronomical Society,
Other
Scientific paper
We use Hα data from SINGG (The Survey for Ionization in Neutral Gas Galaxies) to measure the star formation rate density of the local universe. SINGG is a survey of nearby galaxies selected by their HI content, resulting in a sample free of many of the biases common to other surveys of star-forming galaxies. Our results, derived from over 300 galaxies, confirm that star formation has drastically decreased in gas-rich galaxies since z 1.5. Additionally, we break down the Hα and R-band luminosity densities in terms of the integrated properties of our sample, including HI mass, stellar luminosity, dynamical mass, and surface brightness. We find that the SINGG sample covers a wider range in each of these variables than do optically-derived samples, and that significant star formation occurs in types of galaxies which would not be included in many other samples. A comparison of the dynamical masses of our galaxies with their stellar and HI masses shows significant evidence of downsizing: the most massive galaxies have a larger fraction of their mass locked up into stars than HI, while the opposite is true for less massive galaxies.
Hanish Daniel
Meurer Gerhardt R.
SINGG Team
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