J/ApJ/445/62ivo://CDS.VizieR/J/ApJ/445/62doi:10.26093/cds/vizier.14450062CDSHooper E.J.Impey C.D.Foltz C.B.Hewett P.C.1998-06-04T18:05:39Z1998-06-04T18:05:32ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frquasarsredshiftedradio-sourcesApproximately 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.1995ApJ...445...62Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/445/62CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/445/62https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/445/62http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/445/62https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/445/62https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/445/62http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/445/62GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/ApJ/445/62/table2Radio and optical observations of LBQS quasarsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLBQSSource namemeta.id;meta.maincharBmagB magnitudemagphot.mag;em.opt.BfloatzRedshiftsrc.redshiftfloatBMagAbsolute B magnitudemagphys.magAbs;em.optfloate_BMagrms uncertainty on BMagmagstat.errorfloatl_S8.4GHzLimit flag on S8.4GHzmeta.code.errorcharS8.4GHzFlux density at 8.4GHzmJyphot.flux.density;em.radio.6-12GHzfloate_S8.4GHz? rms uncertainty on S8.4GHzmJystat.errorfloatnullablel_logLr/LbLimit flag on logLr/Lbmeta.code.errorcharlogLr/LbRatio of 8.4GHz luminosity to optical luminosity averaged over the B passbandphys.luminosity;arith.ratiofloate_logLr/Lb? rms uncertainty on logLr/Lbstat.errorfloatnullablel_logLrLimit flag on logLrmeta.code.errorcharlogLrLuminosity at 8.4GHzlog(W.Hz**-1)phys.luminosityfloate_logLr? rms uncertainty on logLrlog(W.Hz**-1)stat.errorfloatnullable