Southern Galactic Plane Survey (SGPS) - HI Observations

The Southern Galactic Plane Survey (SGPS) was a large-scale project to image at arcminute resolution the H I spectral line and 21 cm continuum emission in parts of the plane of the Milky Way. The survey covered Galactic longitudes 253 deg <= l <= 358 deg and latitudes |b|<=1.5d (SGPS I), plus a first quadrant extension covering 5deg<=l<=20deg and |b|<=1.5d (SGPS II). The survey combines data from the Australia Telescope Compact Array and the Parkes Radio Telescope for sensitivity to angular scales ranging from 2' to several degrees. The combined data cover 325 deg2 and have an rms sensitivity of 1.6 K. This data set provides an unprecedented view of the neutral component of interstellar hydrogen in the inner Milky Way.