Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284...44c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 1, 1984, p. 44-53.
Astronomy and Astrophysics
Astrophysics
51
Cosmology, Elliptical Galaxies, Galactic Evolution, Radio Galaxies, Spiral Galaxies, Brightness Temperature, Red Shift
Scientific paper
Radio source counts, the strong-source redshift distribution, and the local luminosity functions of elliptical and spiral galaxies are used to constrain the evolution of radio sources selected at 1.4 GHz. These observables are expressed in terms of 'visibility functions' to show quantitatively (1) the insensitivity of statistical tests on faint-source samples to possible cutoffs at high redshifts, (2) the precision with which source evolution must be specified by physical theory before the density parameter Omega can be determined from source counts, and (3) differential evolution is not required by the data - all sources can evolve in the same way, regardless of luminosity. Spiral galaxies may account for both the majority of radio sources with with less than 1 mJy and a significant fraction of the discrete-source sky brightness temperature at 1.4 GHz.
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