J/MNRAS/514/164ivo://CDS.VizieR/J/MNRAS/514/164doi:10.26093/cds/vizier.75140164CDSStone Z.Shen Y.Burke C.J.Chen Y.-C.Yang Q.Liu X.Gruendl R.A.,Adamow M.Andrade-oliveira F.Annis J.Bacon D.Bertin E.Bocquet S.,Brooks D.Burke D.L.Carnero Rosell A.Carrasco Kind M.Carretero J.,Da Costa L.N.Pereira M.E.S.De Vicente J.Desai S.Diehl H.T.,Doel P.Ferrero I.Friedel D.N.Frieman J.Garcia-Bellido J.,Gaztanaga E.Gruen D.Gutierrez G.Hinton S.R.Hollowood D.L.,Honscheid K.James D.J.Kuehn K.Kuropatkin N.Lidman C.Maia M.A.G.,Menanteau F.Miquel R.Morgan R.Paz-Chinchon F.Pieres A.,Plazas Malagon A.A.Rodriguez-Monroy M.Sanchez E.Scarpine V.,Serrano S.Sevilla-Noarbe I.Smith M.Suchyta E.Swanson M.E.C.,Tarle G.To C.(the Des Collaboration)2025-10-10T20:12:12Z2025-06-05T14:31:54ZCDS support team

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

cds-question@unistra.frquasarsblack-holesvisible-astronomyphotometryastrometryastronomical-modelsWe study the optical gri photometric variability of a sample of 190 quasars within the SDSS Stripe 82 region that have long-term photometric coverage during ~1998-2020 with SDSS, PanSTARRS-1, the Dark Energy Survey, and dedicated follow- up monitoring with Blanco 4m/DECam. With on average ~200 nightly epochs per quasar per filter band, we improve the parameter constraints from a Damped Random Walk (DRW) model fit to the light curves over previous studies with 10-15 yr baselines and <~ 100 epochs. We find that the average damping time-scale {tau}_DRW_ continues to rise with increased baseline, reaching a median value of ~750 d (g band) in the rest frame of these quasars using the 20-yr light curves. Some quasars may have gradual, long-term trends in their light curves, suggesting that either the DRW fit requires very long baselines to converge, or that the underlying variability is more complex than a single DRW process for these quasars. Using a subset of quasars with better-constrained {tau}_DRW_ (less than 20 per cent of the baseline), we confirm a weak wavelength dependence of {tau}_DRW_ {prop.to} {lambda}^0.51+/-0.20^. We further quantify optical variability of these quasars over days to decades time-scales using structure function (SF) and power spectrum density (PSD) analyses. The SF and PSD measurements qualitatively confirm the measured (hundreds of days) damping time-scales from the DRW fits. However, the ensemble PSD is steeper than that of a DRW on time-scales less than ~ a month for these luminous quasars, and this second break point correlates with the longer DRW damping time-scale.2022MNRAS.514..164Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/514/164CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 2009)J/ApJ/854/160 : SDSS and DES long-term extreme variability QSOsJ/ApJ/753/106 : Quasar variability with SDSS and POSS imagingJ/MNRAS/499/6053 : Indiv. opt. variability of AGNs from MEXSAS2J/A+A/627/A33 : Optically variable AGN in COSMOS field (De Cicco+, 2019)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/ApJS/241/34 : The SDSS Reverberation Mapping (SDSS-RM) projectII/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+,2016)II/371 : The Dark Energy Survey (DES): Data Release 2 (Abbott+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/514/164https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/514/164http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/514/164https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/514/164https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/514/164http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/514/164GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/514/164/table1 (Properties of variability for our quasars sample in SDSS Stripe 82 region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/514/164/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/514/164/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/514/164/table1?GETtext/xml+votable180.050000true41.94829889-0.802796940.0055555555555555565/4437 6/17741 17745-17747 17752-17753 17756-17757https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/514/164?format=asciiOpticaldefaultJ/MNRAS/514/164/table1Properties of variability for our quasars sample in SDSS Stripe 82 regionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDDatabase ID for each quasar (DBID) (1)meta.id;meta.mainintRAJ2000Right ascension (J2000) (RA)degpos.eq.ra;meta.mainlog(Signr)Logarithm of Jitter noise term in SDSS r-band (log_JITTER_r) (2)magstat.stdev;phot.mag;em.optdoublee_log(Signr)Lower error of log(Signr) (log_JITTER_r_ERR_L)magstat.errordoubleE_log(Signr)Upper error of log(Signr) (log_JITTER_r_ERR_U)magstat.error;stat.maxdoubleRMSrThe intrinsic RMS variability in the SDSS r-band {sigma}_0,r_ (SIG0_r) (3)magstat.stdev;phot.mag;em.optdoublee_RMSrError of RMSr (SIG0_r_ERR)magstat.errordoubleDEJ2000Declination (J2000) (DEC)degpos.eq.dec;meta.mainzRedshift (Z)src.redshiftdoublelog(Mbh)Logarithm of the black hole mass (log_M_BH)log(solMass)phys.massdoublee_log(Mbh)Error of the black hole mass log(Mbh) (log_M_BH_ERR)log(solMass)stat.errordoublelog(Lbol)Logarithm of the bolometric luminosity (log_LBOL)log(1e-07W)phys.luminositydoublee_log(Lbol)Error of the bolometric luminosity (log_LBOL_ERR)log(1e-07W)stat.errordoublelog(tauObsg)Logarithm of {tau}_DRW_ damping time-scale of the DRW light curve model fit in the SDSS g-band observed frame (log_TAU_OBS_g)log(d)time.scale;phys.atmol.damping;stat.fit.paramdoublee_log(tauObsg)Lower error of log(tauObsg) (log_TAU_OBS_g_ERR_L)log(d)stat.errordoubleE_log(tauObsg)Upper error of log(tauObsg) (log_TAU_OBS_g_ERR_U)log(d)stat.error;stat.maxdoublelog(tauRestg)Logarithm of {tau}_DRW_ in the SDSS g-band rest frame (log_TAU_REST_g)log(d)time.scale;phys.atmol.damping;stat.fit.paramdoublee_log(tauRestg)Lower error of log(tauRestg) (log_TAU_REST_g_ERR_L)log(d)stat.errordoubleE_log(tauRestg)Upper error of log(tauRestg) (log_TAU_REST_g_ERR_U)log(d)stat.error;stat.maxdoublelog(SigDRWg)The logarithm of {sigma}_DRW_ long-term standard deviation of variability in SDSS g-band (log_SIGMA_g)magstat.fit.param;stat.stdev;phot.magdoublee_log(SigDRWg)Lower error of log(SigDRWg) (log_SIGMA_g_ERR_L)magstat.errordoubleE_log(SigDRWg)Upper error of log(SigDRWg) (log_SIGMA_g_ERR_U)magstat.error;stat.maxdoublelog(Signg)Logarithm of Jitter noise term in SDSS g-band (log_JITTER_g) (2)magstat.stdev;phot.mag;em.optdoublee_log(Signg)Lower error of log(Signg) (log_JITTER_g_ERR_L)magstat.errordoubleE_log(Signg)Upper error of log(Signg) (log_JITTER_g_ERR_U)magstat.error;stat.maxdoubleRMSgThe intrinsic RMS variability in the SDSS g-band {sigma}_0,g_ (SIG0_g) (3)magstat.stdev;phot.mag;em.optdoublee_RMSgError of RMSg (SIG0_g_ERR)magstat.errordoublelRestgRest-frame wavelength the target was observed in g-band (LAMBDA_REST_g) (4)0.1nmem.wl.central;em.UVdoublelog(tauObsr)Logarithm of {tau}_DRW_ damping time-scale of the DRW light curve model fit in the SDSS r-band observed frame (log_TAU_OBS_r)log(d)time.scale;phys.atmol.damping;stat.fit.paramdoublee_log(tauObsr)Lower error of log(tauObsr) (log_TAU_OBS_r_ERR_L)log(d)stat.errordoubleE_log(tauObsr)Upper error of log(tauObsr) (log_TAU_OBS_r_ERR_U)log(d)stat.error;stat.maxdoublelog(tauRestr)Logarithm of {tau}_DRW_ in the SDSS r-band rest frame (log_TAU_REST_r)log(d)time.scale;phys.atmol.damping;stat.fit.paramdoublee_log(tauRestr)Lower error of log(tauRestr) (log_TAU_REST_r_ERR_L)log(d)stat.errordoubleE_log(tauRestr)Upper error of log(tauRestr) (log_TAU_REST_r_ERR_U)log(d)stat.error;stat.maxdoublelog(SigDRWr)The logarithm of {sigma}_DRW_ long-term standard deviation of variability in SDSS r-band (log_SIGMA_r)magstat.fit.param;stat.stdev;phot.magdoublee_log(SigDRWr)Lower error of log(SigDRWr) (log_SIGMA_r_ERR_L)magstat.errordoubleE_log(SigDRWr)Upper error of log(SigDRWr) (log_SIGMA_r_ERR_U)magstat.error;stat.maxdoublelRestrRest-frame wavelength the target was observed in r-band (LAMBDA_REST_r) (4)0.1nmem.wl.central;em.UVdoublelog(tauObsi)Logarithm of {tau}_DRW_ damping time-scale of the DRW light curve model fit in the SDSS i-band observed frame (log_TAU_OBS_i)log(d)time.scale;phys.atmol.damping;stat.fit.paramdoublee_log(tauObsi)Lower error of log(tauObsi) (log_TAU_OBS_i_ERR_L)log(d)stat.errordoubleE_log(tauObsi)Upper error of log(tauObsr) (log_TAU_OBS_i_ERR_U)log(d)stat.error;stat.maxdoublelog(tauResti)Logarithm of {tau}_DRW_ in the SDSS i-band rest frame (log_TAU_REST_i)log(d)time.scale;phys.atmol.damping;stat.fit.paramdoublee_log(tauResti)Lower error of log(tauResti) (log_TAU_REST_i_ERR_L)log(d)stat.errordoubleE_log(tauResti)Upper error of log(tauResti) (log_TAU_REST_i_ERR_U)log(d)stat.error;stat.maxdoublelog(SigDRWi)The logarithm of {sigma}_DRW_ long-term standard deviation of variability in SDSS i-band (log_SIGMA_i)magstat.fit.param;stat.stdev;phot.magdoublee_log(SigDRWi)Lower error of log(SigDRWi) (log_SIGMA_i_ERR_L)magstat.errordoubleE_log(SigDRWi)Upper error of log(SigDRWi) (log_SIGMA_i_ERR_U)magstat.error;stat.maxdoublelog(Signi)Logarithm of Jitter noise term in SDSS i-band (log_JITTER_i) (2)magstat.stdev;phot.mag;em.optdoublee_log(Signi)Lower error of log(Signi) (log_JITTER_i_ERR_L)magstat.errordoubleE_log(Signi)Upper error of log(Signi) (log_JITTER_i_ERR_U)magstat.error;stat.maxdoubleRMSiThe intrinsic RMS variability in the SDSS i-band {sigma}_0,i_ (SIG0_i) (3)magstat.stdev;phot.mag;em.optdoublee_RMSiError of RMSi (SIG0_i_ERR)magstat.errordoublelRestiRest-frame wavelength the target was observed in i-band (LAMBDA_REST_i) (4)0.1nmem.wl.central;em.UVdoublelcgShow the light curvemeta.ref.urlcharlcrShow the light curvemeta.ref.urlcharlciShow the light curvemeta.ref.urlcharSDSS-DR7Display the QSO properties catalog SDSS-DR7 Shen et al. 2011ApJS..194...45S, Cat. J/ApJS/194/45meta.ref.urlcharSimbadNameSimbad column added by the CDSmeta.idcharnullable