Studies of new complete samples of quasi-stellar radio sources from the 4C and Parkes catalogs

Details Studies of new complete samples of quasi-stellar radio sources from the 4C and Parkes catalogs Studies of new complete samples of quasi-stellar radio sources from the 4C and Parkes catalogs

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apjs...36..317w&link_type=abstract

Astrophysical Journal Supplement Series, vol. 36, Mar. 1978, p. 317-358.

Astronomy and Astrophysics

Astronomy

157

Luminosity, Quasars, Radio Astronomy, Red Shift, Astronomical Photometry, Astronomical Spectroscopy, Cosmology, Spatial Distribution, Tables (Data)

Scientific paper

Spectroscopic and photometric observations of complete samples of 140 radio-detected QSOs selected from the 4C and Parkes surveys are analyzed. The compilation of the samples and the optical data for 92 QSOs are described, and the 'V/Vm' test for evolution is reviewed. Some observational selection effects that could influence the conclusions are discussed, the observable properties of the objects are examined, and various correlations among them are considered. The evolution revealed by the analysis of each sample is investigated, and the radio-optical luminosity function for QSOs at a redshift z = 1 is derived for an emitted wavelength of 2500 A and an emitted frequency of 500 or 5000 MHz. The results confirm previous evidence for strong cosmological evolution and also show that: (1) there is some evidence of anisotropy in the 4C sample between declinations -4 and +4 deg; (2) there may be an upper limit to the ratio of radio to optical luminosity; and (3) the redshift distributions in the various samples are very similar, and there is no statistically significant evidence for larger redshifts among the QSOs associated with sources selected at higher frequencies.

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