A Sky Survey of Neutral Hydrogen at l 21 cm. I. The General Distribution and Motions of the Local Gas

Abstract

A survey for neutral hydrogen of the whole sky visible from Sydney has been carried out with a multichannel H-line receiver and a 2°.2 aerial beam. A sample of the profiles obtained has been analysed to present the disposition of local hydrogen in terms of three schematic diagrams: (1) the distribution of N H, the number of hydrogen atoms in a line-of-sight column of 1 cm" section, (2) a diagram of representative line halfwidths, and (3) the observed distribution of profile peak radial velocities.