The counting of radio sources - Is evolution necessary?

Details The counting of radio sources - Is evolution necessary? The counting of radio sources - Is evolution necessary?

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95....5d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, Jan. 1988, p. 5-14.

Astronomy and Astrophysics

Astronomy

9

Astronomical Models, Cosmology, Luminosity, Radio Sources (Astronomy), Brightness, Flux Density, Radio Galaxies, Red Shift

Scientific paper

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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