Mathematics – Logic
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196..597w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 196, Aug. 1981, p. 597-610. NSF-supported research.
Mathematics
Logic
36
Astronomical Models, Cosmology, Evolution (Development), Extragalactic Radio Sources, Star Distribution, Ultrahigh Frequencies, Luminous Intensity, Quasars
Scientific paper
A technique for deriving cosmological evolution from source counts and identifications is applied to data at 2700 MHz. The analysis is carried out on the assumption that two populations with different evolutionary behaviors appear in surveys at this frequency: steep-spectrum sources with extended radio structures, and non-steep-spectrum sources with compact structures, the majority of which are identified with QSOs. The 2700-MHz data add constraints to the evolution deduced for the steep-spectrum sources from low-frequency data; in particular, of the two types of model obtained in the analysis of the 408-MHz data, only one now appears tenable. The present results for non-steep-spectrum sources agree with the results from luminosity/volume tests on samples of flat-spectrum QSOs; the change in space density with epoch appears less dramatic than for the powerful radio sources with steep spectra and extended radio structures.
Longair Malcolm S.
Pearson Timothy. J.
Wall Jasper V.
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