J/ApJ/909/18ivo://CDS.VizieR/J/ApJ/909/18doi:10.26093/cds/vizier.19090018CDSFeng H.-C.Hu C.Li S.-S.Liu H.T.Bai J.M.Xing L.-F.Wang W.-Y.,Yang Z.-X.Xiao M.Lu K.-X.2022-10-14T13:57:42Z2022-08-19T07:50:39ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleivisible-astronomybroad-band-photometryspectroscopyThe changes of broad emission lines should be a crucial issue in understanding the physical properties of changing-look active galactic nuclei (CL-AGNs). Here we present the results of an intensive and homogeneous 6 month long reverberation mapping (RM) monitoring campaign during a low-activity state of the CL-AGN Seyfert galaxy NGC3516. Photometric and spectroscopic monitoring was carried out during 2018-2019 with the Lijiang 2.4m telescope. The sampling is 2d in most nights, and the average sampling is ~3d. The rest-frame time lags of H{alpha} and H{beta} are {tau}_H{alpha}_=7.56_-2.10_^+4.42^ and {tau}_H{beta_}=7.50_-0.77_^+2.05^days, respectively. From an rms H{beta} line dispersion of {sigma}_line_=1713.3+/-46.7km/s and a virial factor of f_{sigma}_=5.5, the central black hole mass of NGC3516 is estimated to be M_BH_=2.4_-0.3_^+0.7^x10^7^M_{sun}_, which is in agreement with previous estimates. The velocity-resolved delays show that the time lags increase toward negative velocity for both H{alpha} and H{beta}. The velocity-resolved RM of H{alpha} is done for the first time. These RM results are consistent with other observations before the spectral-type change, indicating a basically constant broad-line region structure during the CL process. The CL model of changes of accretion rate seems to be favored by long-term H{beta} variability and RM observations of NGC 3516.2021ApJ...909...18Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/909/18CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/111/696 : Rotation curves of Seyfert galaxies with companions (Keel 1996)J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)J/MNRAS/383/581 : Broad-line Balmer decrements in blue AGN (Dong+, 2008)J/ApJ/716/993 : LAMP: reverberation mapping of H and He lines (Bentz+, 2010)J/ApJ/782/45 : SEAMBHs. I. Mrk 142, Mrk 335, and IRAS F12397+3333 (Du+, 2014)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/827/118 : A new reverberation mapping campaign on NGC 5548 (Lu+, 2016)J/ApJ/828/78 : Optical monitoring of the Seyfert I NGC 3516 (Noda+, 2016)J/ApJ/840/97 : Opt. reverberation mapping of 5 AGNs (Fausnaugh+, 2017)J/ApJ/849/161 : BVRI light curves of the BL Lac object Mrk 501 (Feng+, 2017)J/ApJ/866/133 : Continuum-H{beta} light curves of 5 Seyfert 1 (De Rosa+, 2018)J/ApJ/869/142 : Monitoring AGNs with H{beta} Asymmetry (MAHA). I. (Du+, 2018)J/ApJ/854/160 : SDSS & DES long-term extreme variability QSOs (Rumbaugh+, 2018)J/ApJ/880/155 : RI photometry of blazars S5 0716+714 and 3C 273 (Liu+, 2019)J/ApJ/874/8 : Follow-up sp. of SDSS changing-look QSOs (Macleod+, 2019)J/ApJ/883/94 : Optical and UV follow-up of 1ES 1927+654 (Trakhtenbrot+, 2019)J/ApJ/888/30 : BVRI & spectroscopic light curves of S5 0716+714 (Feng+, 2020)J/ApJ/890/71 : 5100{AA} cont. & emission lines LCs of PG2130+099 (Hu+, 2020)J/A+A/638/A13 : NGC 3516 optical flare (Ilic+, 2020)J/A+A/642/A59 : PKS 1510-089 spectroscopic light curves (Rakshit, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/909/18https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/909/18http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/909/18https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/909/18https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/909/18http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/909/18GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap4.0234554602041486e-19 4.920466254354166e-19OpticaldefaultJ/ApJ/909/18/table1LCs of photometry and linesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-ph[431.42/633.18]? Heliocentric Julian Date of photometry; JD-2458000dtime.epochdoublenullableBmag[2.15/2.3]? Apparent Johnson B band magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag[0.004/0.008]? Uncertainty in Bmagmagstat.error;phot.magfloatnullableHJD-sp[447.35/633.18] Heliocentric Julian Date of spectroscopy; JD-2458000dtime.epochdoubleHa[94.85/162.52] H{alpha} flux in units of 10^-14^erg/s/cm^2^1e-14cW.m**-2.nm**-1phot.flux;em.line.Halphafloate_Ha[6.16/6.17] Uncertainty in Ha1e-14cW.m**-2.nm**-1stat.errorfloatHb[9.27/23.61] H{beta} flux in units of 10^-14^erg/s/cm^2^1e-14cW.m**-2.nm**-1phot.flux;em.line.Hbetafloate_Hb[0.83/0.92] Uncertainty in Hb1e-14cW.m**-2.nm**-1stat.errorfloat