Optical identifications of sources in the Parkes 2.7-GHz selected-areas surveys

Details Optical identifications of sources in the Parkes 2.7-GHz selected-areas surveys Optical identifications of sources in the Parkes 2.7-GHz selected-areas surveys

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976aj.....81..913c&link_type=abstract

Astronomical Journal, vol. 81, Nov. 1976, p. 913-918.

Astronomy and Astrophysics

Astronomy

21

Astronomical Catalogs, Optical Properties, Quasars, Radio Sources (Astronomy), Astronomical Coordinates, Flux Density, Red Shift, Spectrum Analysis, Ubv Spectra, Ultraviolet Spectra

Scientific paper

Optical identifications of sources forming a sample complete above 0.1 Jy at 2700 MHz were made on the basis of accurate radio and optical positions. The identification content is compared with that of other samples. An unusually large fraction of the faint flat-spectrum QSOs do not show an ultraviolet excess because they are at high redshifts (z not less than approximately 2). The relation between radio core luminosity and optical identification class (galaxy or QSO) is considered. It is shown that optical selection effects have entered some cosmological tests based on identified QSOs.

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