Observations of the andromeda galaxy at 11-centimeter wavelength

Science. 1967 May 26;156(3778):1087-8. doi: 10.1126/science.156.3778.1087.

Abstract

Observations of the Andromeda galaxy (M31) at 2695 megahertz reveal more detail than do earlier measurements at lower frequency. The region is highly confused but there is apparently a more dense clustering of sources within the optical outline of the galaxy than without. One source (OA33) near M31 has an interesting. flat spectrum.