The Local Metallicity -- Surface Brightness Relationship in Galactic Disks

Details The Local Metallicity -- Surface Brightness Relationship in Galactic Disks The Local Metallicity -- Surface Brightness Relationship in Galactic Disks

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.8904r&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #89.04; Bulletin of the American Astronomical Society, Vol. 26, p.1468

Astronomy and Astrophysics

Astronomy

Scientific paper

Multi-aperture spectrophotometry of Hii regions in 6 southern spiral galaxies has been used to confirm the existence of a universal correlation between the gas-phase oxygen abundance and the mean underlying I band surface brightness at the radial distance of the Hii region. Such a relationship allows us to circumvent the normal scale dependencies of abundance gradients, and to attempt to model the evolution of a generic galaxy, instead of just our own Milky Way. Although the simple ``closed-box'' model of galaxy evolution predicts almost the right form of this relationship, a more realistic multi-zone model employing exponentially decreasing gas infall provides an extremely good fit to the observational data, provided the expected enriched gas return from dying intermediate- and low-mass stars shedding their envelopes at late epochs is properly taken into account. This same model, with a star formation law based upon self-regulating star formation in a three-dimensional disk (Dopita & Ryder 1994, ApJ, 430, 163), is equally capable of accounting for the analogous relationship between recent massive star formation and stellar surface brightness (Ryder & Dopita 1994, ApJ, 430, 142).

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