The complete spatial coverage and unique blind nature of the HI Parkes All-Sky Survey (HIPASS) has allowed us to identify new HI features which have implications for the origin of the Magellanic Stream. The data presented here include a 2400 deg^2 mosaic of the HI distribution about the South Celestial Pole, revealing a counter-stream which leads the direction of motion of the Clouds, i.e. opposite in direction to the Stream. This strongly supports the gravitational model for the Stream in which the leading and trailing streams are tidally torn from the body of the Magellanic Clouds. This Leading Arm, as well as other recent results which support a tidal scenario, will be discussed.
The Third Stromlo Symposium: The Galactic Halo
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