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15 décembre 2017 Tout le mois


Daisuke Kawata (UCL) — Thick and thin disk formation and evolution in the Milky Way

Vendredi 15 décembre 2017 11:00-12:00 - Amphi

Spectroscopic studies of the abundances of the Galactic disk stars clearly revealed two metal abundance sequences, at high-[alpha/Fe] and low-[alpha/Fe], and high-[alpha/Fe] stars are generally older than low-[alpha/Fe] stars. These old high-[alpha/Fe] and young low-[alpha/Fe] populations are often considered as the thick and thin disk components, respectively. Based on the results of the Auriga cosmological simulations, we demonstrate that two pathways of the disk formation scenarios can naturally explain the observed distribution of these chemically distinct thick and thin disk stars in the Milky Way. We then discuss that the thin disk formation drives the radial migration of stars due to the development of the bar and the spiral arms, and the vertical metallicity gradients for the mono-age populations, which we observed in the Gaia DR1+RAVE data, provide strong constraints on the radial migration and the structure of the Galactic thin disk.

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