J/ApJ/645/856ivo://CDS.VizieR/J/ApJ/645/856doi:10.26093/cds/vizier.16450856CDSWang T.-G.Zhou H.-Y.Wang J.-X.Lu Y.-J.Lu Y.2017-11-06T12:23:21Z2008-02-01T14:11:07ZCDS support team

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

cds-question@unistra.frquasarsradio-sourcesWhether radio-intermediate quasars possess relativistic jets as radio-loud quasars do is an important issue in the understanding of the origin of radio emission in quasars. In this paper, using the two-epoch radio data obtained during the Faint Images of the Radio Sky at Twenty cm (FIRST) and NRAO VLA Sky Survey (NVSS), we identified 89 radio-variable sources in the Sloan Digital Sky Survey (SDSS). Among them, more than half are radio-intermediate quasars (RL=f_20cm_/f_2500{AA}_<250). For all objects with available multiple-band radio observations, the radio spectra are either flat or inverted. The brightness temperature inferred from the variability is larger than the synchrotron self-Compton limit for a stationary source in 87 objects, indicating relativistic beaming. Considering the sample selection and the viewing angle effect, we conclude that relativistic jets probably exist in a substantial fraction of radio-intermediate quasars.2006ApJ...645..856Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/645/856CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)VII/243 : SDSS quasar catalog. III. (Schneider+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/645/856https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/645/856http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/645/856https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/645/856https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/645/856http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/645/856GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/645/856/table1 (Basic data of Radio Variable Quasars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/645/856/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/645/856/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/645/856/table1?GETtext/xml+votable180.050000true15.706875-8.89566670.0055555555555555566/4122 4141 4145 4793 5052 5055 5691 5790 5848 5881 5933 5982 6116 6232 6235 6243 6254 6267 6415 6429 6463 6466 6512 6515 6604 6617 7169 7180 7201 7226 7253 7275 7456 8202 9272 9337 9423 9641 9645 10673 11057 11167 11170 11229 11241 11254 11256 11352 11389 11440 11461 11482 11589 11788 17575 17601 17807 18845 21852 25591 25948 25977 25980 26258 26270 26276 26287 26289 26295 26309 26340 26414 27023 27029 27058 27083 27086 27225 27243 27283 27323 27332 27552 27720 27739 491063.588997330618193e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/645/856?format=asciiRadiodefaultJ/ApJ/645/856/table1Basic data of Radio Variable QuasarsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainzRedshiftsrc.redshiftfloatg'magSDSS g' band magnitudemagphot.mag;em.opt.Bfloate_g'magUncertainty in g'magmagstat.error;phot.mag;em.opt.BfloatSFIRSTFIRST 20cm flux densitymJyphot.flux.density;em.radio.750-1500MHzfloate_SFIRSTUncertainty in SFIRSTmJystat.errorfloatFIRST.DateDate of FIRST observation, in YYYY/MM/DD (1)time.epochcharSNVSSNRAO VLA Sky Survey flux densitymJyphot.flux.density;em.radio.750-1500MHzfloate_SNVSSUncertainty in SNVSSmJystat.errorfloatNVSS.DateDate of NVSS observation, in YYYY/MM/DD (1)time.epochcharlogRLLog of the radio loudness (see text)stat.paramfloatlogTbLog of the brightness temperaturelog(K)phys.temperaturefloatDopplerDoppler factor (see text)spect.dopplerParamfloatSimbadNameSimbad column added by the CDSmeta.idcharFIRSTDisplay the FIRST data (Cat. VIII/71)meta.ref.urlcharNVSSDisplay the NVSS data (Cat. VIII/65)meta.ref.urlcharSDSSDisplay the SDSS data (from the SDSS site)meta.ref.urlchar