The bimodal radio luminosity function of quasars

Details The bimodal radio luminosity function of quasars The bimodal radio luminosity function of quasars

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..207m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, May 15, 1990, p. 207-213.

Astronomy and Astrophysics

Astronomy

129

Quasars, Radio Astronomy, Radio Emission, Astronomical Spectroscopy, Luminosity, Red Shift

Scientific paper

Radio observations of optically-selected quasars are used to study the relationship between optical and radio luminosities. The results suggest that there are two populations of quasar. Radio-loud quasars with radio luminosities greater than 10 to the 25th W/Hz sr are predominanty compact or flat-spectrum sources. The radio-quiet quasars are found to have radio luminosities below 10 to the 24th W/Hz sr. No intermediate radio luminosities are observed. It is shown that the fraction of quasars that are radio-loud is a function of redshift and probably of optical luminosity. It is concluded that these effects are due to the mixing of two quasar populations with differeing luminosity functions and differing degrees of cosmological evolution.

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