Modeling the radial abundance distribution of the transition galaxy ngc 1313

Abstract

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

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

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• The Relationship Between Gas, Stars, and Star Formation in Irregular Galaxies: A Test of Simple Models
• Testing the Hypothesis of Modified Dynamics with Low Surface Brightness Galaxies and Other Evidence
• The O/H Distribution in the Transition Magellanic Galaxy NGC 1313
• Gas-Rich Dwarf Galaxies from the PSS-II --- II. Optical Properties
• The stellar populations of spiral disks.II Measuring and modeling the radial distribution of absorption spectral indices

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• Census of HII regions in NGC 6754 derived with MUSE: Constraints on the metal mixing scale
• Evidence of an interaction from resolved stellar populations: The curious case of NGC1313
• First Detection of X-Ray Line Emission from Type IIn Supernova 1978K with XMM-Newton's RGS