J/AJ/118/1435ivo://CDS.VizieR/J/AJ/118/1435doi:10.26093/cds/vizier.51181435CDSWadadekar Y.Kembhavi A.2023-04-06T16:50:34Z2002-01-14T21:14:34ZCDS support team

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

cds-question@unistra.frquasarsradio-continuum-emissionredshiftedsurveysUsing the most recent (1998) version of the VLA FIRST survey radio catalog, we have searched for radio emission from 1704 quasars taken from the most recent (1993, Cat. <VII/158>) version of the Hewitt & Burbidge quasar catalog. These quasars lie in the roughly 5000 deg2 of sky already covered by the VLA FIRST survey. Our work has resulted in positive detection of radio emission from 389 quasars, of which 69 quasars have been detected for the first time at radio wavelengths. We find no evidence of a correlation between optical and radio luminosities for optically selected quasars. We find indications of a bimodal distribution of radio luminosity, even at a low flux limit of 1 mJy. We show that radio luminosity is a good discriminant between radio-loud and radio-quiet quasar populations, and that it may be inappropriate to make such a division on the basis of the radio-to-optical luminosity ratio. We discuss the dependence of the radio-loud fraction on optical luminosity and redshift.1999AJ....118.1435Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/118/1435CatalogResearchIsServedByTAP VizieR generic servicerelated-toVIII/59 : the FIRST Survey, version 1999Jul (White+ 1999)http://sundog.stsci.edu : FIRSThttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/118/1435https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/118/1435http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/118/1435https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/118/1435https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/118/1435http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/118/1435GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalRadiodefaultJ/AJ/118/1435/table2FIRST detections of quasarsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIAU designationmeta.id;meta.maincharLinkFIRST source(s) matching the IAU Namemeta.refcharSel[ORCXU ] Selection techniquemeta.codecharPmag? Photographic magnitudemagphot.mag;em.opt.BfloatnullableF1.4GHz1.4GHz peak radio fluxmJyphot.flux.density;em.radio.750-1500MHzdoublezRedshiftsrc.redshiftfloatSepSeparation with the FIRST sourcearcsecpos.angDistancefloatNamesAlternative designationmeta.idcharRadioRecent radio detectionmeta.refchar