Internal kinematics of the Milky Way satellites
Dwarfs are the most common type of galaxies in the Universe. They are thought to be the first galaxies formed, and are thus considered the building blocs of larger structures. The Local Group has proven to be an excellent laboratory to study dwarfs, because of their very large population and proximity. This has allowed to study the dwarfs' resolved stellar populations and perform in depth studies of their star formation histories and chemical abundances. However, when it comes to their internal kinematics, they are still mostly unknown. Over the last decades, multiple studies have studied the internal kinematics of a number of dwarf satellites of the Milky Way using line-of-sight velocities. The situation has drastically changed in the last few years, thanks to the astrometry of the Gaia mission. In this talk we will explore the internal kinematics of the satellites of the Milky Way taking advantage of Gaia data and we will also dive in the evolution of these systems using cosmological simulations.