The counting of radio sources - is evolution necessary?

Dasgupta, P. ; Narlikar, J. V. ; Burbidge, G. R. (1988) The counting of radio sources - is evolution necessary? The Astronomical Journal, 95 . pp. 5-14. ISSN 0004-6256

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This paper suggests a new and clear-cut way of deciding whether evolutionary effects are necessary to interpret the observed radio-source counts. To this end, a method is outlined for constructing the parent radio luminosity function from a complete sample of radio sources whose redshifts are all known. It is argued that if such a luminosity function can be constructed without evolutionary parameters, then evolutionary effects are not required. The method is illustrated by its applications to two well-known samples of radio sources. It is further shown that the non-evolving luminosity function satisfies the constraint of sky brightness and is consistent with the observed redshift-flux-density plot. Thus it appears from these investigations that evolution is not required either in luminosity or in number density.

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ID Code:87922
Deposited On:26 Mar 2012 07:28
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