J/MNRAS/491/4925ivo://CDS.VizieR/J/MNRAS/491/4925CDSGraham M.J.Ross N.P.Stern D.Drake A.J.McKernan B.Ford K.E.S.,Djorgovski S.G.Mahabal A.A.Glikman E.Larson S.Christensen E.2024-03-01T14:34:30Z2023-11-15T13:01:12ZCDS support team

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

cds-question@unistra.frblack-holesquasarsvisible-astronomyspectroscopyinfrared-photometryWe present the results of a systematic search for quasars in the Catalina Real-time Transient Survey exhibiting both strong photometric variability and spectroscopic variability over a decadal baseline. We identify 111 sources with specific patterns of optical and mid-infrared photometric behaviour and a defined spectroscopic change. These 'changing-state' quasars (CSQs) form a higher luminosity sample to complement existing sets of 'changing-look' AGNs and quasars in the literature. The CSQs (by selection) exhibit larger photometric variability than the changing-look quasars (CLQs). The spectroscopic variability is marginally stronger in the CSQs than CLQs as defined by the change in H{beta}/[OIII] ratio. We find 48 sources with declining H{beta} flux and 63 sources with increasing H{beta} flux, and discover 8 sources with z>0.8, further extending the redshift arm. Our CSQ sample compares to the literature CLQ objects in similar distributions of H{beta} flux ratios and differential Eddington ratios between high (bright) and low (dim) states. Taken as a whole, we find that this population of extreme varying quasars is associated with changes in the Eddington ratio and the time-scales imply cooling/heating fronts propagating through the disc.2020MNRAS.491.4925Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/491/4925CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS)V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/491/4925https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/491/4925http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/491/4925https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/491/4925https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/491/4925http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/491/4925GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/491/4925/table2 (CSQs selected in CRTS and associated features)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/491/4925/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/491/4925/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/491/4925/table2?GETtext/xml+votable180.050000true5.88041675.89855560.005555555555555556Cone search capability for table J/MNRAS/491/4925/tablea1 (CLQs reported in the literature with CRTS coverage and associated features)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/491/4925/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/491/4925/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/491/4925/tablea1?GETtext/xml+votable180.050000true2.26875-10.57444440.005555555555555556Cone search capability for table J/MNRAS/491/4925/tableb1 (Spectroscopic observations of CSQ candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/491/4925/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/491/4925/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/491/4925/tableb1?GETtext/xml+votable180.050000true5.88041675.89855560.0055555555555555566/36 2084 4124 4306 4481 4558 4589 4690 4843 4863 4941 4947 5002 5008 5102 5123 5149 5213 5361 5377 5380 5406 5440 5448 5467 5644 5653 5693 5717 5754 5843 5864 5866 5872 5877 5887 5908 5922 5985 6028 6057 6083 6262 6270 6420 6423 6433 6452 6463 6466 6536 6556 6567 6605 7193 7297 7494 8280 8348 8362 8392 8508 8580 8599 8688 8693 8744 8778 8812 8848 8868 9052 9066 9093 9098 9106 9174 9262 9268 9352 9354 9391 9473 9756 9763 9832 9842 9945 9952 10016 10261 10305 10431 10511 10612 10733 10786 10900 10990 11033 11200 11266 11307 11419 11426 11458 11970 17250 17291 17302 17515 17558 17602 17668 17748 17751 17753 17757 17763 17772 17819 18051 18096 18524 18617 18775 18788-18789 18865 18918 19050 19114 19413 19521 19727 19909 19987 20005 20073 21973 23058 26467 26995 27026 27029 27037 27092 27120 27370 27387 27564 27731 27848 27929 27938 28060 28288 28359 28376 28400 28471 28506 28543 28616 28652 31314 31344 31389 31457 31535 31672 31691 490983.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/491/4925?format=asciiOpticalInfrareddefaultJ/MNRAS/491/4925/table2CSQs selected in CRTS and associated featureszRedshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameQuasar name (SDSS JHHMMSS.s+DDMMSS.s)meta.id;meta.maincharVmagmedMedian CRTS magnitudemagphot.mag;em.opt.VfloatlogMBH? Logarithm of the quasar masslog(solMass)phys.massfloatnullablelogLVLogarithm of the quasar luminositylog(1e-07W)phys.luminosity;em.optfloatAmpOptical amplitudemagsrc.var.amplitudefloatSWV1Slepian wavelet variance measurestat.variancefloatDW1? Absolute change in W1 |{Delta}W1|magphot.mag;arith.difffloatnullableSimbadNameSimbad column added by the CDSmeta.idcharnullableDBBBayesian block change {Delta}BBmagphot.mag;arith.difffloatD(Hb/[OIII])Change in flux ratio of H{beta} to [OIII]spect.line.intensity;arith.ratiofloat_RAPositions from Name (right ascension part)degpos.eq.ra;meta.main_DEPositions from Name (declination part)degpos.eq.dec;meta.mainJ/MNRAS/491/4925/tablea1CLQs reported in the literature with CRTS coverage and associated featuresSimbadNameSimbad column added by the CDSmeta.idcharnullable_RAPositions from Name (right ascension part)degpos.eq.ra;meta.main_DEPositions from Name (declination part)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameQuasar name (SDSS JHHMMSS.s+DDMMSS except for WISE J105203.5+151929 and WISEA J142846.7+172353)meta.id;meta.maincharf_Name[*] Flag on Name (1)meta.codecharTranTransition (Disappear or Appear) (2)src.classcharVmagmedMedian CRTS magnitudemagphot.mag;em.opt.VfloatzRedshiftsrc.redshiftfloatlogMBH? Logarithm of the quasar masslog(solMass)phys.massfloatnullableAmpOptical amplitudemagsrc.var.amplitudefloatDW1Absolute change in W1 |{Delta}W1|magphot.mag;arith.difffloatDBBBayesian block change {Delta}BBmagphot.mag;arith.difffloatSWV1Slepian wavelet variance measurestat.variancefloatRefReferences (3)meta.refintJ/MNRAS/491/4925/tableb1Spectroscopic observations of CSQ candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameQuasar name (SDSS JHHMMSS.s+DDMMSS.s)meta.id;meta.maincharMJD1First epoch spectra from SDSSdtime.epochcharMJDsubSubsequent epoch spectra from SDSS, Palomar (DBSP), and Keck (LRIS, ESI)dtime.epochcharSimbadNameSimbad column added by the CDSmeta.idcharnullable_RAPositions from Name (right ascension part)degpos.eq.ra;meta.main_DEPositions from Name (declination part)degpos.eq.dec;meta.main