The Star Formation Density of the Local Universe from SINGG

Details The Star Formation Density of the Local Universe from SINGG The Star Formation Density of the Local Universe from SINGG

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717914h&link_type=abstract

American Astronomical Society Meeting 207, #179.14; Bulletin of the American Astronomical Society, Vol. 37, p.1456

Astronomy and Astrophysics

Astronomy

Scientific paper

We have used Hα data from SINGG (the Survey for Ionization in Neutral Gas Galaxies) to measure the star formation rate density of local universe to be log(SFRD(0) [Msolar yr-1 Mpc-3]) = -1.77 + log(h70). The volume-averaged Hα equivalent width of our sample is found to be EW(Hα ) = 29 Å, indicating that star formation in the SINGG galaxies is occurring at about one fourth of its past average rate. This confirms that star formation has drastically decreased in gas-rich galaxies since z ˜ 1.5. We break down the Hα and R band luminosity densities in terms of the properties of the sample galaxies, including HI mass, stellar luminosity, dynamical mass, and surface brightness. 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.

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