Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.172...89z&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 172, no. 1, Oct. 1990, p. 89-107.
Astronomy and Astrophysics
Astronomy
1
Astronomical Models, Luminosity, Radio Sources (Astronomy), Astronomical Spectroscopy, Evolution (Development), Radio Emission, Red Shift
Scientific paper
A method of obtaining the evolution function based on redshift and radio luminosity is presented. An iterative procedure is utilized in determining the redshift-dependent factor of the evolution function on the basis of differential source counts, whereas luminosity distribution is used for deriving the dependence of the evolution function on luminosity. The influence of small variations of the local radio-luminosity function (RLF) and the luminosity distribution is examined, and predictions for the source count curve, redshift, and spectral-index distributions are obtained for the local RLF at 5 GHZ. The proposed method allows to have a single evolution function for F-sources for the whole range of the radio flux density under consideration. The results indicate that the luminosity dependence of the evolution function is significant even in the case of flat-spectrum radio sources.
Kumor-Obryk Barbara
Zawislak-Raczka J.
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