The Halo-Disc dynamical coupling:Gaia blind detection of the Monoceros and ACS structures

The astrometric sample provided by Gaia allows us to study the disc far from the Sun, in the halo and at their interface. It is at the very edge of the disc where the effects of external perturbations is most noticeable, but also where there could be the remnants of accreted satellites. Our goal is to characterise the kinematic substructure present at the edge of the Milky Way (MW) disc to provide observational constrains that can help us identify their origin. We present the most precise characterisation of Monoceros and the Anticentre stream (ACS), detected for the first time exclusively in phase-space, without limiting ourselves to a particular stellar type. Our results allow future works to model their orbital parameters, chemistry and star formation history, to establish their origin and, ultimately, understand the most influential processes that shaped the MW over its history