Radio-frequency Radiation from the Great Nebula in Andromeda (M.31).

Abstract

THE experiments of Bolton and Stanley¹, and of Ryle and Smith^2,3, using a radio interferometer have shown that a significant part of the extra-terrestrial radio noise is associated with point sources with diameters of less than 6 minutes of arc. Although the majority of these sources are unidentified with visual objects, their distribution indicates that they lie in our own galaxy. Attempts to detect radio emissions from specific extra-galactic objects have hitherto been unsuccessful. In this communication we describe the results of an experiment to detect radio emissions from the Andromeda Nebula (M.31) using a narrow pencil-beam aerial and high-sensitivity receiving equipment.