Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-30
AIP Conf.Proc.847:461-463,2006
Astronomy and Astrophysics
Astrophysics
3 pages, 2 figures, contributed paper to be published in the proceedings of" Origin of Matter and Evolution of Galaxies - New
Scientific paper
10.1063/1.2234459
The processes governing both the formation and evolution of elliptical galaxies are discussed by means of a new multi-zone photo-chemical evolution model for elliptical galaxies, taking into account detailed nucleosynthetic yields, feedback from supernovae, Pop III stars and an initial infall episode. By comparing model predictions with observations, we derive a picture of galaxy formation in which the higher is the mass of the galaxy, the shorter are the infall and the star formation timescales. In particular, by means of our model, we are able to reproduce the overabundance of Mg relative to Fe, observed in the nuclei of bright ellipticals, and its increase with galactic mass. This is a clear sign of an anti-hierarchical formation process. Therefore, in this scenario, the most massive objects are older than the less massive ones, in the sense that larger galaxies stop forming stars at earlier times. Each galaxy is created outside-in, i.e. the outermost regions accrete gas, form stars and develop a galactic wind very quickly, compared to the central core in which the star formation can last up to ~1.3 Gyr. This finding will be discussed at the light of recent observations of the galaxy NGC 4697 which clearly show a strong radial gradient in the mean stellar [
Matteucci Francesca
Pipino Antonio
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