Star Formation Histories and Physical Parameters of Local Gas-Rich Galaxies from GALEX+SDSS Photometry

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Origin, Formation, Evolution, Age, And Star Formation, Photography And Photometry

Scientific paper

We use sophisticated SED modeling of Bruzual & Charlot 2003 to build extensive libraries of model galaxies with a wide range of star-formation histories. We compare these SEDs to broad-band UV (GALEX) and optical (SDSS) photometry, and derive a number of galaxy parameters and their confidence ranges. The accuracy of our mass and SFR estimates is comparable to those derived from spectra. We find that most gas-rich galaxies, especially of lower mass, had constant star formation histories, with less massive galaxies evolving faster. Our stellar mass-metallicity relation is systematically lower than the gas-phase relation for the more massive galaxies, again indicating different evolution of low and high mass galaxies.

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