Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19512905b&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #129.05; Bulletin of the American Astronomical Society, Vol. 31, p.1560
Astronomy and Astrophysics
Astronomy
Scientific paper
I present an in-depth study of the star formation histories of spiral galaxies with a wide range of properties. Optical and near-infrared colors are used in conjunction with up-to-date stellar population synthesis models to constrain the ages and metallicities of my sample galaxies. I find that age and metallicity gradients are common in spiral galaxies of all types. The age of a spiral galaxy correlates mainly with its surface brightness, and its metallicity correlates strongly with both its surface brightness and absolute magnitude. Using simple models, I demonstrate that these correlations suggest that the star formation history of a region within a galaxy depends primarily on its surface density, and possibly on the dynamical time. Metal-enriched outflow from low mass galaxies seems to be required to reproduce a reasonably strong metallicity-magnitude correlation.
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