A cosmological study of the star formation history in the solar neighbourhood |
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| Authors: | X Hernández Vladimir Avila-Reese Claudio Firmani |
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| Institution: | 1Instituto de Astronomúa, Universidad Nacional Autónoma de México, A. P. 70-264, 04510 México, D. F.;2Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), Italy |
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| Abstract: | We use a cosmological galactic evolutionary approach to model the Milky Way. A detailed treatment of the mass aggregation and dynamical history of the growing dark halo is included, together with a self-consistent physical treatment for the star formation processes within the growing galactic disc. This allows us to calculate the temporal evolution of star and gas surface densities at all galactic radii, in particular, the star formation history (SFH) at the solar radius. A large range of cosmological mass aggregation histories (MAHs) is capable of producing a galaxy with the present-day properties of the Milky Way. The resulting SFHs for the solar neighbourhood bracket the available observational data for this feature, the most probable MAH yielding the optimal comparison with these observations. We also find that the rotation curve for our Galaxy implies the presence of a constant density core in its dark-matter halo. |
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| Keywords: | stars: formation Galaxy: evolution Galaxy: halo solar neighbourhood galaxies: formation dark matter |
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