Modeling the radial abundance distribution of the transition galaxy ngc 1313

Details Modeling the radial abundance distribution of the transition galaxy ngc 1313 Modeling the radial abundance distribution of the transition galaxy ngc 1313

1999-03-09

arxiv.org/abs/astro-ph/9903129v1

Astrophys.J. 514 (1999) 781

Astronomy and Astrophysics

Astrophysics

14 paginas, 4 figures, to be published in ApJ, april

Scientific paper

10.1086/306982

NGC 1313 is the most massive disk galaxy showing a flat radial abundance distribution in its interstellar gas, a behavior generally observed in magellanic and irregular galaxies. We have attempted to reproduce this flat abundance distribution using a multiphase chemical evolution model, which has been previously used sucessfully to depict other spiral galaxies along the Hubble morphological sequence. We found that it is not possible to reproduce the flat radial abundance distribution in NGC 1313, and at the same time, be consistent with observed radial distributions of other key parameters such the surface gas density and star formation profiles. We conclude that a more complicated galactic evolution model including radial flows, and possibly mass loss due to supernova explosions and winds, is necessary to explain the apparent chemical uniformity of the disk of NGC 1313

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