Physics
Scientific paper
Oct 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962natur.196..155d&link_type=abstract
Nature, Volume 196, Issue 4850, pp. 155-156 (1962).
Physics
1
Scientific paper
As I have recently shown1, the number counts of extragalactic radio sources according to the latest Cambridge survey2 imply that in an evolutionary cosmology there is a minimum rate of evolution of the power of the radio sources, which depends on the time variation assumed for the spatial density of the sources. The particular cases when the spatial density of the sources is always proportional to that of ordinary galaxies and, alternatively, to the square of that of the galaxies, were found to require a diminution of mean source power exceeding 1.4 and 0.2 per cent per 108 years, respectively, at the present epoch. More generally, when no definite assumption was made regarding mean source density nmacr(t) and mean source power Pmacr(t), it was found that agreement with the Cambridge results required a minimum present rate of diminution of the product nmacr(t)Pmacr2(t) equal to 5 per cent per 108 years. In these calculations the Hubble time T was taken to be 1.3 × 1010 years.
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