Radio Sources in the Vicinity of Source M 31

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Science  24 Nov 1967:
Vol. 158, Issue 3804, pp. 1043-1045
DOI: 10.1126/science.158.3804.1043


The region α (right ascension) equal to 23h 50m to 01h 30m, δ (declination) 39°20' to 40°40' has been observed at 195 and 430 megahertz with the 1000-foot (300 m) telescope of the Arecibo Ionospheric Observatory. Eighteen sources from the Ohio Catalogue and source 3C 13 are contained in this region. We conclude that the sources have straight-line spectra with indices between -0.4 and -0.9 and that they are probably not associated with M 31, except those within the optical limit of the nebula.