J/ApJS/276/51ivo://CDS.VizieR/J/ApJS/276/51doi:10.26093/cds/vizier/bb-8m-1kCDSLu K.-X.Li Y.-R.Wu Q.Ho L.C.Zhang Z.-X.Feng H.-C.Li S.-S.,Chen Y.-J.Sun M.Shu X.Guo W.-J.Cheng C.Wang J.-G.Kim D.,Wang J.-M.Bai J.-M.2026-08-03T07:26:08Z2026-02-16T09:54:38ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleivisible-astronomyspectroscopyChanging-look active galactic nuclei (CL-AGNs), characterized by the emergence or disappearance of broad lines accompanied by extreme continuum flux variability, have drawn much attention for their potential to reveal physical processes underlying AGN evolution. We perform seven-season spectroscopic monitoring on Mrk1018, one of the earliest identified CL-AGN. Around 2020, we detect a full-cycle changing-look transition of Mrk 1018 within one year, associated with a nucleus outburst, which likely arose from the disk instability in the transition region between the outer standard rotation- dominated disk and inner advection-dominated accretion flow. Over the past 45 years, the accretion rate of Mrk 1018 changed 1000 times and the maximum Eddington ratio reached 0.02. By investigating the relation between the broad- line properties and the Eddington ratio (Lbol/LEdd), we find strong evidence that the full-cycle-type transition is regulated by accretion. There exists a turnover point in the Balmer decrement, which is observed for the first time. The broad Balmer lines change from a single peak in Types 1.0-1.2 to double peaks in Types 1.5-1.8, and the double-peak separation decreases with increasing accretion rate. We also find that the FWHM of the broad Balmer lines obeys FWHM{propto}(Lbol/LEdd)^-0.27^, as expected for a virialized broad-line region (BLR). The velocity dispersion {sigma}_line_ follows a similar trend in Types 1.5-1.8 but displays a sharp increase in Types 1.0-1.2, resulting in a dramatic drop in FWHM/{sigma}_line_. These findings suggest that a virialized BLR together with accretion-dependent turbulent motions might be responsible for the diversity of BLR phenomena across the AGN population.2025ApJS..276...51Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/276/51CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)VII/259 : 6dF galaxy survey final redshift release (Jones+, 2009)II/328 : AllWISE Data Release (Cutri+ 2013)V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)J/AJ/126/1720 : ugriz and H{alpha} of double-peaked AGN (Strateva+, 2003)J/ApJ/613/682 : AGN masses & broad-line region sizes (Peterson+, 2004)J/A+A/417/515 : I Zw 1 unusual emission line spectrum (Veron-Cetty+, 2004)J/ApJ/716/993 : LAMP: reverberation mapping of H and He lines (Bentz+, 2010)J/ApJS/189/15 : FeII emission in a sample of AGN spectra (Kovacevic+, 2010)J/ApJ/736/86 : FeII emission in SDSS type 1 AGNs (Dong+, 2011)J/ApJ/739/57 : Ultra hard X-ray AGNs in the Swift/BAT survey (Koss+, 2011)J/MNRAS/423/600 : Type-1 low-z AGN emission properties (Stern+, 2012)J/MNRAS/426/2703 : Type 1 AGN at low z. II. (Stern+, 2012)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)J/ApJ/825/126 : SEAMBHs. V. The third year (Du+, 2016)J/MNRAS/455/2918 : Phot. & line luminosities for ASASSN-14li (Holoien+, 2016)J/ApJ/851/21 : SDSS RM project first year of observations (Grier+, 2017)J/ApJ/856/6 : SEAMBHs IX. 10 new H{beta} light curves (Du+, 2018)J/ApJ/859/116 : BH masses and Eddington ratios of Type 2 QSOs (Kong+, 2018)J/ApJ/887/135 : V-band, 5100{AA} & broad emission LCs of Mrk 79 (Lu+, 2019)J/ApJ/883/94 : Optical & UV follow-up of 1ES 1927+654 (Trakhtenbrot+, 2019)J/MNRAS/491/4925 : Changing-state quasars with CRTS (Graham+, 2020)J/ApJ/905/75 : 3yrs spectroscopic light curves of PG0026+129 (Hu+, 2020)J/ApJ/912/92 : Lijiang/YFOSC light curves of NGC 2617 (Feng+, 2021)J/ApJ/918/50 : Reverberation mapping for Mrk 817 and NGC 7469 (Lu+, 2021)J/ApJS/263/10 : 2015, 2018-2021 sp. monitoring of NGC 5548 (Lu+, 2022)J/ApJS/258/38 : Iron template sp. from Mrk493 HST/STIS obs. (Park+, 2022)J/ApJS/272/13 : Changing-look AGN. I. (Panda+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/276/51https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/276/51http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/276/51https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/276/51https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/276/51http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/276/51GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJS/276/51/table1Fluxes of broad Balmer linesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSet[1/2] Observation period; 1=previous observations or 2=seven-seasonmeta.codeintJD[44097.5/60324] Observation date, JD-2400000dtime.epochdoubleFHb[0.001/20.6] Broad H{beta} flux, 10^-14^erg/s/cm^2^1e-17W.m**-2phot.flux;em.line.Hbetafloate_FHb[0.05/0.2] Uncertainty in FHb1e-17W.m**-2stat.error;phot.flux;em.line.HbetafloatFHa[0.01/41] Broad H{alpha} flux, 10^-14^erg/s/cm^2^1e-17W.m**-2phot.flux;em.line.Halphafloate_FHa[0.08/0.4] Uncertainty in FHa1e-17W.m**-2stat.error;phot.flux;em.line.Halphafloat