J/A+A/698/A105ivo://CDS.VizieR/J/A+A/698/A105doi:10.26093/cds/vizier/bc-nt/lbafCDSYuk H.Dai X.2026-07-03T06:37:07Z2025-06-03T11:05:03ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiphotometryvisible-astronomyVariability is a ubiquitous feature of active galactic nuclei (AGNs), and the characterisation of the variability is crucial to constrain its physical mechanism and proper applications in AGN studies. The advent of all-sky and high-cadence optical surveys allows more accurate measurements of AGNs variability down to short timescales and direct comparisons with X-ray variability from the same sample of sources. We aim to analyse the optical power spectral density (PSDs) of AGNs with measured X-ray PSDs. We use light curves from the All-Sky Automated Survey for SuperNovae (ASAS-SN) and the Transiting Exoplanet Survey Satellite (TESS) and use the Lomb-Scargle periodogram to obtain PSDs. The joint optical PSD is measured over up to six orders of magnitude in frequency space from timescales of minutes to a decade. We fit either a damped random walk (DRW) or a broken power law (BPL) model to constrain the PSD model and break frequency. We find a set of break frequencies (<10^-2^day^-1^) from DRW and BPL fits that generally confirm previously reported correlations between break frequencies and the black hole mass. In addition, we find a second set of break frequencies at higher frequencies (>10^-2^day^-1^). We observe a potential weak correlation between the high-frequency breaks with the X-ray break frequencies and black hole mass. We further explore the dependence of the correlations on other AGN parameters, finding that adding either X-ray, optical, or bolometric luminosity as the third correlation parameter can substantially improve the correlation significances. The newly identified high-frequency optical breaks can constrain different aspects of the physics of AGNs.2025A&A...698A.105Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/698/A105CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/366 : ASAS-SN catalog of variable stars (Jayasinghe+, 2018-2020)IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/698/A105https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/698/A105http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/698/A105https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/698/A105https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/698/A105http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/698/A105GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/698/A105/sources (List of studied AGNs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/698/A105/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/698/A105/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/698/A105/sources?GETtext/xml+votable180.050000true107.1728333-49.551750.0055555555555555566/4439 5367 7642 8922 10912 10927 13414 19283 19883 25907 28517 28535 34065 34845 34881 38268 38653 39118 41586 43806 43877 45779https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/698/A105?format=asciiOpticaldefaultJ/A+A/698/A105/sourcesList of studied AGNsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the galaxymeta.id;meta.maincharRAJ2000Simbad right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad declination (J2000)pos.eq.dec;meta.mainLCasas[*] Light curve data from ASAS-SN in tablea2.datmeta.codecharlcASASShow the V and g light curvesmeta.ref.urlcharLCtess[*] Light curve data from TESS in tablea2.datmeta.codecharlcTESSShow the Tess light curvesmeta.ref.urlcharSimbadNameSimbad column added by the CDSmeta.idcharnullableJ/A+A/698/A105/tablea1ASAS-SN light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the galaxymeta.id;meta.maincharFilter[Vg] Filter (V or g)meta.id;instr.filtercharHJDHeliocentric Julian date of observationdtime.epochdoubleindexedFluxFlux in filtermJyphot.flux.density;em.optdoublee_FluxFlux in filter errormJystat.error;phot.fluxdoubleJ/A+A/698/A105/tablea2TESS light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the galaxymeta.id;meta.maincharSectorTESS observing sectorobs.fieldintJDTESS observation Julian date (JD-2457000)dtime.epochdoubleindexedFluxFluxmJyphot.flux.density;em.optdoublee_FluxFlux errormJystat.error;phot.fluxdouble