Source count analysis for a homogeneous sample of faint radio quasars

Details Source count analysis for a homogeneous sample of faint radio quasars Source count analysis for a homogeneous sample of faint radio quasars

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....42..365f&link_type=abstract

Astronomy and Astrophysics, vol. 42, no. 3, Sept. 1975, p. 365-377.

Astronomy and Astrophysics

Astrophysics

16

Luminosity, Quasars, Radio Spectra, Red Shift, Astronomical Catalogs, Cosmology, Elliptical Galaxies, Statistical Analysis

Scientific paper

The statistical properties of a sample of 80 faint radio quasars are investigated, and the data are compared with those for samples of stronger quasars from the 3CR and 4C catalogs. A significant correlation is found between radio spectral-index distribution (408 to 4995 MHz) and apparent magnitude; a less significant correlation is found between spectral-index distribution and the ratio (R) of radio to optical flux. The flux and magnitude distributions of the sample are analyzed in the framework of two Friedman cosmological models, and the quasar distribution in unit comoving volume is derived as a function of R. The results indicate that (1) the quasar counts are explained for a wide range of R values by a density evolution law similar to the one already found for the 3CR and 4C samples, (2) quasars with low R values evolve significantly lower in number density with increasing redshift, (3) a large fraction of nearer quasars are bright radio sources, and (4) the radio luminosity of nearer quasars matches that of the radio nuclei of elliptical galaxies, suggesting some association between quasars and violent events in the nuclei of giant ellipticals.

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