Galactic Radiation at Radio Frequencies. III. Galactic Structure

Abstract

From radio-frequency observations it is deduced that the sun is situated in or near an arm of a spiral galaxy. The first part of this paper consists of an analysis of the radio-frequency data followed by the presentation of optical evidence in favour of a spiral form. The sense of rotation of the Galaxy -that of the spiral unwinding- is in accordance with the theories of Lindblad and Milne.