Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-11-07
Astronomy and Astrophysics
Astrophysics
9 pages, 6 postscript figures, MNRAS in press
Scientific paper
10.1046/j.1365-8711.2000.03228.x
We study the relations between luminosity and chemical abundance profiles of spiral galaxies, using detailed models for the chemical and spectro-photometric evolution of galactic discs. The models are ``calibrated'' on the Milky Way disc and are successfully extended to other discs with the help of simple ``scaling'' relations, obtained in the framework of semi-analytic models of galaxy formation. We find that our models exhibit oxygen abundance gradients that increase in absolute value with decreasing disc luminosity (when expressed in dex/kpc) and are independent of disc luminosity (when expressed in dex/scalelength), both in agreement with observations. We notice an important strong correlation between abundance gradient and disc scalelength. These results support the idea of ``homologuous evolution'' of galactic discs.
Boissier Samuel
Prantzos Nikos
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