J/MNRAS/268/305ivo://CDS.VizieR/J/MNRAS/268/305doi:10.26093/cds/vizier.72680305CDSHook I.M.McMahon R.G.Boyle B.J.Irwin M.J.2024-06-24T06:09:45Z1997-12-09T21:38:16ZCDS support team

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

cds-question@unistra.frquasarsredshiftedapparent-magnitudeThe variability properties of a sample of ~300 optically selected quasars near the South Galactic Pole (SGP) have been studied over a baseline of 16 years using a series of twelve UK Schmidt Telescope B_J_ plates at seven epochs. In this sample there is a correlation between variability and both quasar luminosity and redshift, at greater than the 99 per cent significance level. Quasars of high luminosity show significantly less variability than those with low luminosity, the rms variation ranging from about 0.25mag at M_B_=-23 to 0.1mag at M_B_=-28. The observed trends can be explained by an intrinsic dependence of quasar variability on luminosity combined with the effects of time dilation, and have implications for quasar samples selected by variability or multicolour techniques. The change in the slope of the n(m) relation at the break can be less pronounced in variability-selected samples. Our results can be used to test models for the origin and reprocessing of the continuum emission in quasars.1994MNRAS.268..305Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/268/305CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/353/77 : Luminous QSO variability & polarization (Teerikorpi+, 2000)J/A+A/321/123 : Optical variability of QSOs (Cristiani+ 1997)J/A+AS/143/357 : Tuorla Quasar Monitoring (Katajainen+ 2000)J/MNRAS/260/202 : Quasar luminosity function (Hawkins+, 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/268/305https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/268/305http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/268/305https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/268/305https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/268/305http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/268/305GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/268/305/tablea1 (Positions, redshifts, mean apparent Bj magnitudes and variability index for the SGP sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/268/305/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/268/305/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/268/305/tablea1?GETtext/xml+votable180.050000true10.5278008-28.25379440.0055555555555555565/4160-4161 4163-4164 8937-8939 8942 6/16469 16649 16660 16664-16665 35583 35747 35760 35762-35763 35772 35774https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/268/305?format=asciiOpticaldefaultJ/MNRAS/268/305/tablea1Positions, redshifts, mean apparent Bj magnitudes and variability index for the SGP sampleNoteNotes (3)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA1950Right ascension (1950.0)pos.eq.ra;meta.mainDE1950Declination (1950.0)pos.eq.dec;meta.mainzRedshiftsrc.redshiftfloatBjMean apparent B_J_ magnitudemagphot.mag;em.opt.BfloatsigVVariability index {sigma}_V_ (1)meta.code;src.var.indexfloatRefReference (2)meta.ref;pos.frameint_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed