J/A+A/707/A213ivo://CDS.VizieR/J/A+A/707/A213CDSJana A.Ricci C.Tortosa A.Dimopoulos G.Trakhtenbrot B.Bauer F.E.,Temple M.Koss M.Gupta K.K.Chang H.-K.Diaz Y.Illic Y.Kallova K.,Shablovinskaya E.2026-04-02T06:28:33Z2026-03-09T09:21:58ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleix-ray-sourcesaccretionChanging-state active galactic nuclei (CSAGNs) exhibit rapid variability, with mass accretion rates that can change by several orders of magnitude in a few years. This provides us with a unique opportunity to study the evolution of the inner accretion flow almost in real time. Here, we used over 1000 observations to study the broadband X-ray spectra of a sample of five CSAGNs, spanning three orders of magnitude in Eddington ratio ({lambda}_Edd_), using phenomenological models to trace the evolution of key spectral components. We derive several fundamental parameters, such as the photon index, soft excess strength, reflection strength, and luminosities of the soft excess and primary continuum. We find that the soft excess and primary continuum emissions show a very strong positive correlation (p<<10^-10^), suggesting a common physical origin. The soft excess strength does not show any dependency on the reflection parameter, suggesting that in these objects the soft excess is not dominated by a blurred ionized reflection process. On the other hand, the strength of the soft excess is found to be strongly positively correlated with the Eddington ratio (p<<10^-10^), and we find that the soft excess vanishes below log {lambda}Edd~-2.5. Moreover, we find a clear 'V'-shaped relation for {Gamma}-{lambda}Edd, with a break at log{lambda}Edd=-2.47+/-0.09. Our findings indicate a change in the geometry of the inner accretion flow at low Eddington ratios, and that the soft excess is primarily produced via warm Comptonization.2026A&A...707A.213Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/707/A213CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/707/A213https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/707/A213http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/707/A213https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/707/A213https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/707/A213http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/707/A213GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/707/A213/table1 (General properties of the CSAGNs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/707/A213/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/707/A213/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/707/A213/table1?GETtext/xml+votable180.050000true65.002-54.9380.0055555555555555566/17727 17814 21824 33958 46533https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/707/A213?format=asciiX-raydefaultJ/A+A/707/A213/table1General properties of the CSAGNsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCommon namemeta.id;meta.maincharBATBAT IDmeta.idintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainzRedshiftsrc.redshiftfloatdLLuminosity distanceMpcpos.distancefloatMBHBlack hole masssolMassphys.massfloate_MBH? Black hole mass errorsolMassstat.errorfloatnullabler_MBHBlack hole mass reference (1)meta.ref;pos.framecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/707/A213/tablebData analysis result (tables B1-B5)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (1)meta.id;meta.maincharID[1/214] Sequential numbermeta.recordintObsStartObservation start date (MJD)dtime.start;obsdoubleObsEndObservation end dat (MJD)dtime.end;obsdoubleTypeSpectral typesrc.spTypeintkTBBTemperature of BBeVphys.temperatureinte_kTBB? Error of kTBBeVstat.errorintnullableGammaPhoton indexmeta.code;spect.indexfloate_GammaError of Gammastat.errorfloatl_logLSELimit flag on Gammameta.code.errorcharlogLSE0.5-2 keV SE luminositylog(1e-07W)phys.luminosity;em.X-rayfloate_logLSE? Error of SE luminositylog(1e-07W)stat.errorfloatnullablelogLPC2-10 keV PC luminositylog(1e-07W)phys.luminosity;em.X-rayfloate_logLPCError of L_PClog(1e-07W)stat.errorfloatlogEddR? Eddington Ratiophys.luminosity;arith.ratiofloatnullablee_logEddR? Error of Eddington ratiostat.errorfloatnullablel_logQLimit flag on logQmeta.code.errorcharlogQSoft excess strengthstat.fit.paramfloate_logQ? Error of SE strengthstat.errorfloatnullableCCash-statisticsstat.fit.paramintdofDegrees-of-freedomstat.fit.dofint