Nature 216, 351 - 352 (28 October 1967); doi:10.1038/216351a0

On the Space Distribution of Identified Quasi-stellar Objects and Radiogalaxies

G. R. BURBIDGE & F. HOYLE

University of California, San Diego.
Institute of Theoretical Astronomy, University of Cambridge.

THE ratio of identified quasi-stellar radio sources to identified radiogalaxies in the 3CR catalogue is about 1:2. As the identified sources constitute a large fraction of all the extragalactic sources in the catalogue, and redshifts have been obtained for a considerable fraction, it is clear that the complete identification of all such sources could not change this ratio in a very significant way. It follows therefore that, independent of any optical selection effect, the number of quasi-stellar radio sources is approximately comparable with the number of radiogalaxies down to a radio flux of 9 units at 178 Mc/s.

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