J/AJ/121/1872ivo://CDS.VizieR/J/AJ/121/1872doi:10.26093/cds/vizier.51211872CDSHelfand D.J.Stone R.P.S.Willman B.White R.L.Becker R.H.Price T.,Gregg M.D.McMahon R.G.2023-04-06T16:50:41Z2001-06-16T12:30:29ZCDS support team

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

cds-question@unistra.frquasarsphotometryredshiftedWe have obtained single-epoch optical photometry for 202 quasars, taken from the FIRST Bright Quasar Survey (FBQS), which span a wide range in radio loudness. Comparison with the magnitudes of these objects on the POSS-I plates provides by far the largest sample of long-term variability amplitudes for radio-selected quasars yet produced. We find the quasars to be more variable in the blue than in the red band, consistent with work on optically selected samples. The previously noted trend of decreasing variability with increasing optical luminosity applies only to radio-quiet objects. Furthermore, we do not confirm a rise in variability amplitude with redshift, nor do we see any dependence on radio flux or luminosity. The variability over a radio-optical flux ratio range spanning a factor of 60000 from radio-quiet to extreme radio-loud objects is largely constant, although there is a suggestion of greater variability in the extreme radio-loud objects. We demonstrate the importance of Malmquist bias in variability studies and develop a procedure to correct for the bias in order to reveal the underlying variability properties of the sample.2001AJ....121.1872Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/121/1872CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/15 : Einstein EMSS Survey (Gioia+ 1990, Stocke+ 1991)VIII/59 : the FIRST Survey, version 1999Jul (White+ 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/121/1872https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/121/1872http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/121/1872https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/121/1872https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/121/1872http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/121/1872GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/121/1872/table2 (FIRST Variable Quasar Catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/121/1872/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/121/1872/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/121/1872/table2?GETtext/xml+votable180.050000true109.393666729.27047220.0055555555555555565/2365 6/4942 4946-4947 4950 4961 4974 4977 5014 5028 5035 5070 5087 5098 5102 5104 5106 5169 5202 5207 5212-5213 5244 5270-5271 5274 5305-5306 5310 5312 5338 5342 5345 5347 5353 5371 5546-5547 5635 5637 5647-5648 5651-5652 5667 5669-5670 5685 5690 5693-5694 5696 5698 5704 5711 5713 5722 5764 5773 5792-5793 6206 6223 6228 6233-6234 6236 6244 6246 6270 6291-6292 6336 6418 6430 6456-6457 6463 6465-6466 6479 6489 6496 6535-6536 6544-6545 6548 6565 8915 9038 9045 9060 9077 9109 9151 9181 9272 9284 9306 9318 9327 9329 9333-9334 9359 9362 9365-9366 9370 9372 9381 9383 9385 9402 9409 9412 9442 9447 9459 9467 9470 9473 9482-9483 9490 9497 9499 9503 9509 9546 9550 9568 9600 9604 9607 9620 9632-9633 9637 9641 9728 9737 9754 9761 9790 9812 9859 9861 9877 9882 10318 10325 10330 10337 10341 10392 10422 10432 10459 10461 10471-10472 10481 10501 10545 10563 10571 10624 10817 18773 18779 19019-19020 19036 19044 19053 19058 19091 19094 19101 28477 28552 28587 28657 32475 32682 32687https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/121/1872?format=asciiOpticaldefaultJ/AJ/121/1872/table2FIRST Variable Quasar CatalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLinkDisplay the FIRST datameta.refcharRAJ2000FIRST radio Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000FIRST radio Declination (J2000)pos.eq.dec;meta.mainObs1Year of POSS-I observationyrtime.epochdoubleObs2Year of CCD observationyrtime.epochdoublef_Bmag[*] Indicates a source with too few CCD calibration stars to recalibrate the POSS-I magnitudesmeta.code.errorcharBmagExtinction-corrected B band magnitudemagphot.mag;em.opt.BfloatOmagExtinction-corrected POSS-I O band magnitudemagphot.mag;em.opt.BfloatB-OThe (B-O) colormagphot.colorfloatRmagExtinction-corrected R band magnitudemagphot.mag;em.opt.RfloatEmagExtinction-corrected POSS-I E band magnitudemagphot.mag;em.opt.RfloatR-EThe (R-E) colormagphot.colorfloatP20cmThe peak 20cm (1.5GHz) flux densitymJyphot.flux.density;em.radio.1500-3000MHzdoubleI20cmThe integrated 20cm (1.5GHz) flux densitymJyphot.flux.density;em.radio.1500-3000MHzdoublezRedshiftsrc.redshiftfloatBMagThe absolute B band magnitudemagphys.magAbs;em.optfloatlogLumLog of the radio luminosity in erg/cm^2^/s/Hz (1)log(mW.m**-2.Hz**-1)phys.luminosity;em.radiofloatlogRLog of the K-corrected 5GHz radio to 2500{AA} optical luminosity (2)phot.flux;arith.ratiofloatMorphRadio morphology (3)src.morph.typechar