Abstract
IT is now recognized that most of the observed radio sources are extragalactic objects with radio powers greater than that of the Galaxy. It is, however, impossible to measure the distance of an individual source directly from radio observations alone, so that apart from the few sources for which optical red-shifts are available estimates of the radio luminosity function have had to be made by indirect means.
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CLARKE, R. Interpretation of ‘Surface Brightness’ Measurements of Radio Sources. Nature 194, 171–172 (1962). https://doi.org/10.1038/194171a0
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DOI: https://doi.org/10.1038/194171a0
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