Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.283..357c&link_type=abstract
Nature, vol. 283, Jan. 24, 1980, p. 357, 358.
Astronomy and Astrophysics
Astronomy
15
Extraterrestrial Radio Waves, Quasars, Star Distribution, Stellar Luminosity, Radio Astronomy, Spectrum Analysis
Scientific paper
The paper deals with a search for radio emission from bright optically selected quasars, in which approximately 50 percent of the quasars could be detected at 5 GHz. This radio detection rate is so much higher than that for faint quasars that it requires that the distribution of radio-to-luminosity ratios be correlated with optical properties and/or with distance (or cosmic epoch). The values of the radio-to-luminosity ratio in the present sample range from roughly 0.01 to 0.00001 (where radio detection is no longer possible). So broad and smooth a distribution argues against a distinct dichotomy between 'radio-quiet' and 'radio-loud' quasars. The quasars in the sample, which remain undetected at radio frequencies must exhibit a spectral flux distribution rising from the radio to optical, previously considered an 'abnormal' spectrum for a quasar.
Condon James J.
Odell S. L.
Puschell Jeffery J.
Stein Wayne A.
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