Computer Science – Numerical Analysis
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.193..683w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 193, Dec. 1980, p. 683-706.
Computer Science
Numerical Analysis
80
Astronomical Models, Cosmology, Extragalactic Radio Sources, Galactic Evolution, Spatial Distribution, Distribution (Property), High Frequencies, Luminous Intensity, Numerical Analysis, Radio Spectra, Statistical Analysis
Scientific paper
A simple numerical procedure for analyzing the counts of extragalactic radio sources is described. The scheme makes efficient use of the extensive data base which is now available for studying the spatial distribution of radio sources. The method is first applied to data at 408 MHz. It is shown that, if proper statistical testing is incorporated, the technique provides strong support for the qualitative conclusions of previous analyses: the comoving density of the more powerful radio sources with extended structure is now less than at earlier epochs by a factor of not less than 1000. However, several evolution models proposed earlier are quantitatively unsatisfactory, and new models are derived which adequately describe the current data.
Longair Malcolm S.
Pearson Timothy. J.
Wall Jasper V.
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