Galactic All Sky Survey

The Parkes Galactic All Sky Survey (GASS) is a survey of the atomic hydrogen (HI) emission in the Milky Way for the entire sky south of d = +1° using the thirteen beam 20 cm multibeam receiver on the Parkes Radio Telescope. GASS covers all Milky Way velocities between LSR -400 km/s and 500 km/s. GASS is the most sensitive fully-sampled survey of Galactic HI ever made in the Southern sky. Survey goals include a better understanding of the interaction of the Milky Way disk and halo and the nature of high and intermediate velocity clouds (HVCs and IVCs).