- Bence Kocsis (Oxford)
Carme Gallart (IAC) "The History of the Galactic disc and halo from Gaia DR2 HR diagram fitting"
Abstract: Gaia has provided distances and photometry, and thus colour-magnitude diagrams in the absolute plane, for stars over an unprecedented vast volume in the Milky Way, encompassing significant fractions of the thin and thick disk, and halo. This has allowed us, for the first time, to derive unprecedentedly detailed star formation histories from direct modelling of these colour-magnitude diagrams, using the same techniques that have been proven successful for external galaxies in the Local Group. I will discuss our first results for a volume of 2 Kpc radius from the Sun. They have allowed us to date the first events involved in the formation of the inner Milky Way halo (Gallart et al. 2019, NatAstro) and to determine the presence of epochs of enhanced star formation well constrained in time, that can be associated to the various pericentric passages of the Sagittarius dwarf galaxy (Ruiz-Lara et al. 2020, NatAstro). Additionally, we have obtained results of unprecedented clarity regarding the vertical distribution of ages en the Milky Way disk (Gallart et al. 2020, in prep).