J/ApJ/887/15ivo://CDS.VizieR/J/ApJ/887/15doi:10.26093/cds/vizier.18870015CDSWang J.Xu D.W.Wang Y.Zhang J.B.Zheng J.Wei J.Y.2021-09-17T08:43:23Z2021-06-04T08:15:59ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleivisible-astronomyspectroscopyquasarsWe report a spectroscopic identification of two new changing-look active galactic nuclei (CL-AGNs): SDSSJ104705.16+544405.8 and SDSSJ120447.91+170256.8, both with a "turn-off" type transition from type-1 to type-1.8/1.9. The identification is arrived at through a follow-up spectroscopic observation of the five CL-AGNs candidates that are extracted from the sample recently released in MacLeod+ (2019, J/ApJ/874/8). The candidates are extracted by the authors from the Sloan Digit Sky Survey Data Release 7, and are spectroscopically confirmed quasars with large amplitude variability. By compiling a sample of 26 previously identified CL-AGNs, we confirm the claim by MacLeod+ that CL-AGNs tend to be biased against a low Eddington ratio, and identify an overlap between the CL-AGNs at their dim state and the so-called intermediate-type AGNs. The overlap implies that there two populations of the intermediate-type AGNs with different origins. One is due to the torus orientation effect, and the other to the intrinsic change of the accretion rate of the central supermassive black holes.2019ApJ...887...15Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/887/15CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/116 : Spectrophotometric Standards (Massey+ 1988)VI/64 : Recombination line intensities for hydrogenic ions (Storey+ 1995)V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)J/A+A/417/515 : I Zw 1 unusual emission line spectrum (Veron-Cetty+, 2004)J/ApJS/166/128 : Narrow line Seyfert 1 galaxies from SDSS-DR3 (Zhou+, 2006)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/ApJ/792/30 : NEOWISE magnitudes for near-Earth objects (Mainzer+, 2014)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/ApJ/793/108 : SEAMBHs. II. Continuum and Hbeta LCs (Wang+, 2014)J/ApJ/806/22 : SEAMBHs IV. H{beta} time lags (Du+, 2015)J/ApJS/234/16 : Halpha & Hbeta spectral regions of low-z QSOs (Chen+, 2018)J/ApJ/854/160 : SDSS & DES long-term variability QSOs (Rumbaugh+, 2018)J/ApJ/874/8 : Follow-up spec. of SDSS changing-look QSOs (Macleod+, 2019)J/ApJ/883/94 : Opt. and UV follow-up of 1ES 1927+654 (Trakhtenbrot+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/887/15https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/887/15http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/887/15https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/887/15https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/887/15http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/887/15GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/887/15/table1 (Log of spectroscopic observation for five candidates selected in MacLeod et al. 2019, J/ApJ/874/8)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/887/15/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/887/15/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/887/15/table1?GETtext/xml+votable180.050000true133.246753.22238890.0055555555555555566/4107 6044 7287 27506 278943.588997330618193e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/887/15?format=asciiOpticaldefaultJ/ApJ/887/15/table1Log of spectroscopic observation for five candidates selected in MacLeod et al. 2019, J/ApJ/874/8recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharprimaryz[0.21/0.61] Redshiftsrc.redshiftfloatgmag[16.19/18.07] SDSS g-band (AB) magnitudemagphot.mag;em.opt.BfloatDateDate of observation (UT)time.epochnullableExp[2400/7200] Total exposure timestime.duration;obs.exposureintSpInteractive spectrum plotmeta.ref.urlcharSloanDisplay the online SDSS-DR14 data for the nearest objectmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar_RAPositions from SDSS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS names (declination part)degpos.eq.dec;meta.mainJ/ApJ/887/15/zd1047Xinglong spectrum of SDSS J104705.16+544405.8 (Data behind Figure 1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[2963.8/7180.3] Spectrum wavelength in Angstrom units0.1nmem.wldoubleFlux[-4e-17/8.4e-16] Flux in erg/s/cm^2^/{AA} unitscW.m**-2.nm**-1meta.unit;phot.fluxdoubleJ/ApJ/887/15/zd1204Xinglong spectrum of SDSS J120447.91+170256.8 (Data behind Figure 1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[2963.8/7180.3] Spectrum wavelength in Angstrom units0.1nmem.wldoubleFlux[-4e-17/8.4e-16] Flux in erg/s/cm^2^/{AA} unitscW.m**-2.nm**-1meta.unit;phot.fluxdouble