Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.191..871s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 191, June 1980, p. 871-886.
Astronomy and Astrophysics
Astronomy
35
Emission Spectra, Quasars, Radio Astronomy, Radio Emission, Astronomical Models, Astronomical Photometry, Light (Visible Radiation), Luminosity, Radiant Flux Density, Radio Spectra, Red Shift, Tables (Data)
Scientific paper
Results of 5.0 and 14.5 GHz radio observations of continuum emission from 122 quasars discovered purely by optical means are presented. The quasars were first observed by the direct detection of emission lines in objective-prism spectra taken with the 61-cm Curtis Schmidt telescope in the range 3400-5300 A, and absolute optical spectrophotometry of all the quasars was obtained with a SIT vidicon spectrometer. Approximately 10% of the quasars observed were detected to exhibit radio emission above a flux density of 20 mJy, with a detection rate of 35% for the 17 most luminous quasars and a high detection rate among quasars of lowest redshift. Considerations of the factor of 1000 difference in radio to optical luminosity ratios between certain radio-detected quasars and the large dispersion of radio flux compared to the dispersion in redshifts indicate that quasar radio flux density cannot depend only on distance and/or intrinsic optical luminosity. Implications of the results for quasar emission models involving the alignment of ejected, ultra-compact radio lobes are discussed.
Smith Malcolm G.
Wright Alan E.
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