J/ApJ/445/62 J/ApJ/445/62 Radio properties of optically selected quasars E J Hooper C D Impey C B Foltz P C Hewett Astrophys. J. 445 62 1995 1995ApJ...445...62H QSOs Radio sources Redshifts quasars: general radio continuum: galaxies surveys Approximately one-quarter (256 objects) of the Large Bright Quasar Survey (LBQS, Hewett et al., 1995, Cat. <J/AJ/109/1498>) has been observed with the VLA at 8.4GHz, resulting in 44 detections (17%) with a median 3{sigma} noise limit of 0.29mJy. Quasars with radio luminosity detectable at this limit are under-represented at faint absolute blue magnitudes (M_B_>=-24), an effect which cannot be explained by a potential LBQS selection bias against quasars which have large radio luminosities and small optical luminosities. The radio-loud (8GHz luminosity >10^25^W/Hz) fraction is observed to change as a function of redshift and MB, for M_B_<-24, although the causal variable is ambiguous. The description most consistent with the available data is that radio-loud fraction is approximately constant over the range -27.5<M_B_<-24 and increases at brighter absolute magnitudes. The radio-loud fraction as a function of redshift reaches a local maximum at z~1, and, aside from the effects of increased radio-loud fraction at bright M_B_, remains roughly constant to redshifts approaching 5. The log R_8.4_ distribution (radio-to-optical luminosity ratio) of the current LBQS sample may be bimodal, but the results of statistical tests are ambiguous, requiring a larger sample size to become definite.

LBQS Source name --- Bmag B magnitude mag z Redshift --- BMag Absolute B magnitude mag e_BMag rms uncertainty on BMag mag l_S8.4GHz Limit flag on S8.4GHz --- S8.4GHz Flux density at 8.4GHz mJy e_S8.4GHz rms uncertainty on S8.4GHz mJy l_logLr/Lb Limit flag on logLr/Lb --- logLr/Lb Ratio of 8.4GHz luminosity to optical luminosity averaged over the B passband --- e_logLr/Lb rms uncertainty on logLr/Lb --- l_logLr Limit flag on logLr --- logLr Luminosity at 8.4GHz [W/Hz] e_logLr rms uncertainty on logLr [W/Hz] James Marcout, Patricia Bauer CDS 1997Jul25 UNKNOWN UNKNOWN * 25-Jul-1997: prepared via OCR at CDS. * 04-Jun-1988: two OCR errors where corrected, thanks to H. Andernach <heinz@astro.ugto.mx> J_ApJ_445_62.xml