A cosmological study of the star formation history in the solar neighbourhood

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 tr eatment 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 h istories (MAHs) is capable of producing a galaxy with the present-day prope rties of the Milky Way. The resulting SFHs for the solar neighbourhood brac ket the available observational data for this feature, the most probable MA H yielding the optimal comparison with these observations. We also find tha t the rotation curve for our Galaxy implies the presence of a constant dens ity core in its dark-matter halo.