Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244....5c&link_type=abstract
Astrophysical Journal, Part 1, vol. 244, Feb. 15, 1981, p. 5-11.
Astronomy and Astrophysics
Astronomy
23
Quasars, Radio Sources (Astronomy), Statistical Analysis, Astronomical Catalogs, Data Sampling, Magnitude
Scientific paper
A complete sample of 12 radio sources stronger than 10 mJy at 5.0 GHz are identified with optically selected quasars (discovered with the Curtis-Schmidt telescope) on the basis of precise radio-optical position coincidence. Radio spectra determined from flux densities at 0.408, 1.465, 2.29, 5.0, and 14.5 GHz indicate synchrotron self-absorption in 11 cases. The only steep-spectrum source is resolved by the VLA at 1.465 GHz. It is shown that the spectral-index distributions of radio sources identified with optically selected quasars can vary only weakly with radio finding frequency since the radio number-flux-density relation of these identifications is so flat. The number-magnitude distributions of radio-selected and optically selected quasars are compared and interpreted in terms of a radio-optical core-flux correlation. Finally, physical differences between radio-selected and optically selected quasars are considered. It is found that differing orientations of relativistically beamed radio jets cannot explain the differences between the radio luminosity functions of radio-selected and optically selected quasars.
Condon James J.
Condon M. A.
Jauncey David L.
Smith Malcolm G.
Turtle A. J.
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