Semi-Analytic Models of Abundance Gradients in External Galaxies

Details Semi-Analytic Models of Abundance Gradients in External Galaxies Semi-Analytic Models of Abundance Gradients in External Galaxies

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.5302a&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #53.02; Bulletin of the American Astronomical Society, Vol. 33, p.1381

Astronomy and Astrophysics

Astronomy

Scientific paper

We analyze observed abundance gradients as a function of Galactocentric radius for the external Galaxies NGC4254 and NGC4303. We model the abundance gradients of Nitrogen, Oxygen, and Sulfur for several semi-analytic models. These models isolate the affect of the low metallicity infall term. We conclude that the low metallicity infall models can not adequately explain the steep abundance gradients in these spiral galaxies. Therefore, additional chemical and dynamical mechanisms must be responsible for the observed abundances.

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