Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005assl..329p..69s&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
We derive physical parameters including stellar mass, star-formation rates (SFRs), dust attenuation and burst mass fractions for 6472 galaxies observed recently by the Galaxy Evolution Explorer (GALEX), and present in the SDSS DR1 main spectroscopic sample. Parameters are estimated by comparing each observed broad-band SED (two GALEX and five SDSS bands) with an extensive library of model galaxy SEDs. We compare the constraints derived using SDSS bands only with those derived using the combination of SDSS and GALEX photometry and find that the addition of the GALEX bands leads to significant improvement in the estimation of both the dust optical depth and the star formation rate over timescales of 100 Myr to 1 Gyr. We are sensitive to SFRs as low as 10-3 M&sun; yr-1, which are mostly associated with early-type, red galaxies. The least massive galaxies have ratios of current to past-averaged SF rates (b-parameter), consistent with constant SF over a Hubble time. For late-type galaxies, this ratio (on average) decreases with mass. We find that b correlates tightly with NUV-r color, implying that the SF history of a galaxy can be constrained on the basis of the NUV-r color alone. The fraction of galaxies that have undergone a significant starburst episode within the last Gyr steeply declines with mass -- from ˜ 20% for galaxies with ˜ 108 M&sun; to ˜ 5% for ˜ 1011 M&sun; galaxies.
GALEX Science Team
Salim Samir
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