Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-07-07
Astronomy and Astrophysics
Astrophysics
Proceedings of IAU Symposium 254 "The Galaxy disk in a cosmological context", Copenhagen, June 2008, 6 pages, 4 pages
Scientific paper
We use a series of high-resolution N-body simulations of a `Milky-Way' halo, coupled to semi-analytic techniques, to study the formation of our own Galaxy and of its stellar halo. Our model Milky Way galaxy is a relatively young system whose physical properties are in quite good agreement with observational determinations. In our model, the stellar halo is mainly formed from a few massive satellites accreted early on during the galaxy's lifetime. The stars in the halo do not exhibit any metallicity gradient, but higher metallicity stars are more centrally concentrated than stars with lower abundances. This is due to the fact that the most massive satellites contributing to the stellar halo are also more metal rich, and dynamical friction drags them closer to the inner regions of the host halo.
de Lucia Gabriella
Helmi Amina
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