The four leading arms of the Magellanic Cloud system - Evidence for interaction with Milky Way disk and halo

Context. The Magellanic Cloud System (MCS) interacts via tidal and drag forces with the Milky Way galaxy. Aims. Using the Parkes Galactic All‐Sky Survey (GASS) of atomic hydrogen we explore the role of drag on the evolution of the so-called Leading Arm (LA). Methods. We present a new image recognition algorithm that allows us to differentiate features within a 3-D data cube (longitude, latitude, radial velocity) and to parameterize individual coherent structures. We compiled an Hi object catalog of LA objects within an area of 70 ◦ x 85 ◦ (1.6 sr) of the LA region. This catalog ⋆ comprises information of location, column density, line width, shape and