Abstract
ON the basis of some new observations made at a frequency of 2,700 MHz, Shimmins, Bolton and Wall1 have derived radio source counts having a slope of −1.4. They claim that these differ significantly from the Cambridge results and cast doubt on the validity of the interpretation of the counts in terms of evolutionary cosmological models. We wish to point out that these doubts are unfounded, and that there is little discrepancy between the Australian observations and the Cambridge source-counts which have been made at 178 and 408 MHz.
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References
Shimmins, A. J., Bolton, J. G., and Wall, J. V., Nature, 217, 818 (1968).
Gower, J. F. R., Mon. Not. Roy. Astro. Soc., 133, 151 (1966).
Ryle, M., Invited Discourse C, IAU Prague (1967).
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Galt, J. A., and Kennedy, J. E. D., Astron. J. (in the press).
Pooley, G. G., and Kenderdine, S., Mon. Not. Roy. Astro. Soc. (in the press).
Scheuer, P. A. G., in Galaxies and the Universe (edit. by Sandage, A. and M.) (in the press).
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POOLEY, G. Counts of Radio Sources at 2,700 MHz. Nature 218, 153–154 (1968). https://doi.org/10.1038/218153b0
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DOI: https://doi.org/10.1038/218153b0
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