Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.222..487z&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 222, Oct. 1, 1986, p. 487-497.
Astronomy and Astrophysics
Astronomy
4
Astronomical Models, Astronomical Spectroscopy, Radio Sources (Astronomy), Stellar Evolution, Quasars, Radiant Flux Density
Scientific paper
An attempt has been made to derive the evolution function of flat-spectrum sources selected near 5 GHz. The iterative method of Robertson was used to obtain evolution functions fitting well the differential source counts. The influence of small variations of the local RLF on these evolution functions was examined. The evolution function satisfying the assumed conditions is nearly pure density evolution and fits well the source counts above a flux density of about 15 mJy. Below this value the source counts predicted by this evolution function are too high. This can be regarded as the result of differences between the population of sources observed at flux densities greater than about 10 mJy, which are mostly quasars, and those with smaller flux densities (galaxies). The evolution function has been obtained for the former population, and does not reproduce the counts of fainter sources.
Kumor-Obryk Barbara
Zawislak-Raczka J.
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