The Radio Loud Fraction of QSOS and its Dependence on Magnitude and Redshift

Details The Radio Loud Fraction of QSOS and its Dependence on Magnitude and Redshift The Radio Loud Fraction of QSOS and its Dependence on Magnitude and Redshift

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263..461p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 263, NO.2/JUL15, P. 461, 1993

Astronomy and Astrophysics

Astronomy

39

Scientific paper

The first determination of the optical evolution and luminosity function of radio-loud quasars is obtained from the PG sample, the only sizeable complete sample of optically selected quasars with full radio information. The optical evolution of radio-loud quasars is found to be similar to (if the `R' definition of radio-loudness is applied), or possibly stronger than (if the luminosity definition is applied), the evolution of radio-quiet quasars. The shapes of the luminosity functions for the radio-loud and radio-quiet classes appear to be different in both cases. The relative number of radio-loud quasars is in fact a function of optical luminosity, ranging (locally) from ~ 20-50 per cent at M_B_<~-24.5 to ~7-8 per cent at fainter absolute magnitudes; in total, about 16-20 per cent of quasars brighter than ~-21.5 are radio-loud. The observed dependence of the fraction of radio-loud quasars on redshift and apparent magnitude, suggested by various radio surveys of optically selected quasars can be explained by the luminosity function and evolution derived for the two quasar classes, and by the fact that different surveys sample different parts of the optical luminosity functions.

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