Radio Properties of Optically Selected Quasars

Details Radio Properties of Optically Selected Quasars Radio Properties of Optically Selected Quasars

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.3507h&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #35.07; Bulletin of the American Astronomical Society, Vol. 24, p.1173

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Approximately one quarter (255 objects) of the Large Bright Quasar Survey has been observed at 8.4 GHz with the VLA in C configuration. The median 3 sigma noise limit was 0.29 mJy, and 45 objects (18%) were detected. The radio-loud (8.4 GHz luminosity > 10(25) W Hz(-1) ) fraction for objects with MB < -24 remains constant at ~ 10 % from z = 0.5 to z > 3.5, and there is some evidence that this holds for z < 0.5. There is no correlation between radio luminosity and absolute blue magnitude for MB < -24, and the radio-loud fraction does not depend on blue magnitude. However, the fraction of powerful radio sources with MB > -24 drops precipitously; among 20 objects, none had detectable radio luminosity above 10(23) W Hz(-1) . The distribution of log R (ratio of radio to optical luminosity) appears to be bimodal, with a gap at log R ~ 1 for all redshifts and absolute magnitudes.

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