GEPI

De la conception instrumentale
à l’exploitation des observables
Accueil > Seminar on 2021.03.01 by Eduardo (...) > The stellar halo of our Galaxy, as (...)

The stellar halo of our Galaxy, as revealed by Gaia

Paola Di Matteo et Misha Haywood

The Gaia DR2 has permitted to understand that the major part of what was thought to be the in-situ Galactic halo of the Milky Way is in fact the remnant of one important merger that probably occurred more than 9 Gyr
ago. These results have opened new interesting questions : what are the characteristics of this accretion event ? Where is the in-situ Galactic halo ? How is it connected to the Galactic thick disk ? We will present these results and discuss the new perspective about the old stellar populations of our Galaxy.