J/ApJ/641/78ivo://CDS.VizieR/J/ApJ/641/78doi:10.26093/cds/vizier.16410078CDSWilhite B.C.Vanden Berk D.E.Brunner R.J.Brinkmann J.V.2007-12-13T16:59:28Z2007-12-13T17:51:43ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiquasarsWe examine the variability of the high-ionization CIV {lambda}1549 line in a sample of 105 quasars observed at multiple epochs by the Sloan Digital Sky Survey. We find a strong correlation between the change in the CIV line flux and the change in the line width, but no correlations between the change in flux and changes in line center and skewness. The relation between line flux change and line width change is consistent with a model in which a broad line base varies with greater amplitude than the line core. The objects studied here are more luminous and at higher redshift than those normally studied for variability, ranging in redshift from 1.65 to 4.00 and in absolute r-band magnitude from roughly -24 to -28.2006ApJ...641...78Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/641/78CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/633/638 : 315 SDSS variable quasar sample (Wilhite+, 2005)J/A+A/321/123 : Optical variability of QSOs (Cristiani+ 1997)J/A+AS/143/465 : Quasar variability (Hawkins+, 2000)J/AJ/131/1923 : Known quasars in the QUEST Variability SurveyJ/MNRAS/268/305 : Variability of optically selected quasars (Hook+ 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/641/78https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/641/78http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/641/78https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/641/78https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/641/78http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/641/78GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/641/78/data (CIV variability sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/641/78/data?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/641/78/data?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/641/78/data?GETtext/xml+votable180.050000true150.05570831.20088890.0055555555555555565/1561 6/2 5915 5918 5930 5937 5939 5940 6267 6268 6271 6507 6511 6593 6595 6597 9841 9974 10232 11343 11444 11445 11447 11464 17745 17763 17769 17774 18750 18833 18835 18836 18837 18844 18845 18882 19417 19750 19753 19763 21982 22001 22005 23103 23183 23207 23211 23212 25839 25937 25940 25943 25961 25966 25997 25999 26002 26011 26025 26175 26204 26205 26206 26210 26211 26229 26230 26236 26237 26261 26961 26966 26968 27237 27245 27281 27283 27286 27287 27289https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/641/78?format=asciiOpticaldefaultJ/ApJ/641/78/dataCIV variability samplezHigh-S/N epoch redshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSource running numbermeta.id;meta.mainintSDSSSDSS name (HHMMSS.ss+DDMMSS.s) (1)meta.idcharMJDHModified Julian date of the high-S/N epochdtime.epochintMJDLModified Julian date of the low-S/N epochdtime.epochintDtauRest-frame time lagdtime.intervalfloatRmagHigh-S/N apparent R band magnitudemagphot.mag;em.opt.RfloatRMAGHigh-S/N absolute R band magnitudemagphys.magAbs;em.opt.RfloatS/NHThe S/N of the high-S/N epochstat.snrfloatS/NLThe S/N of the low-S/N epochstat.snrfloatSDSSdataView the SDSS detailsmeta.ref.urlcharFcontHHigh-S/N continuum flux (1)1e-19W.m**-2.nm**-1phot.fluxfloatFcontLLow-S/N continuum flux (1)1e-19W.m**-2.nm**-1phot.fluxfloatFlineHHigh-S/N line flux (1)1e-19W.m**-2.nm**-1phot.fluxfloatFlineLLow-S/N line flux (1)1e-19W.m**-2.nm**-1phot.fluxfloatlambdaHHigh-S/N median wavelength (1)0.1nmem.wlfloatlambdaLLow-S/N median wavelength (1)0.1nmem.wlfloatEqWH? High-S/N line width (1)0.1nmspect.line.widthfloatnullableEqWL? Low-S/N line width (1)0.1nmspect.line.widthfloatnullablePskewH? High-S/N Pearson skewness valuestat.fit.paramfloatnullablePskewL? Low-S/N Pearson skewness valuestat.fit.paramfloatnullable_RAPosition (derived from the SDSS) (right ascension part)degpos.eq.ra;meta.main_DEPosition (derived from the SDSS) (declination part)degpos.eq.dec;meta.main