J/ApJ/837/131ivo://CDS.VizieR/J/ApJ/837/131doi:10.26093/cds/vizier.18370131CDSPei L.Fausnaugh M.M.Barth A.J.Peterson B.M.Bentz M.C.De Rosa G.,Denney K.D.Goad M.R.Kochanek C.S.Korista K.T.Kriss G.A.,Pogge R.W.Bennert V.N.Brotherton M.Clubb K.I.Dalla Bonta E.,Filippenko A.V.Greene J.E.Grier C.J.Vestergaard M.Zheng W.,Adams S.M.Beatty T.G.Bigley A.Brown J.E.Brown J.S.Canalizo G.,Comerford J.M.Coker C.T.Corsini E.M.Croft S.Croxall K.V.,Deason A.J.Eracleous M.Fox O.D.Gates E.L.Henderson C.B.,Holmbeck E.Holoien T.W.-S.Jensen J.J.Johnson C.A.Kelly P.L.,Kim S.King A.Lau M.W.Li M.Lochhaas C.Ma Z.Manne-Nicholas E.R.,Mauerhan J.C.Malkan M.A.McGurk R.Morelli L.Mosquera A.Mudd D.,Sanchez F.M.Nguyen M.L.Ochner P.Ou-Yang B.Pancoast A.Penny M.T.,Pizzella A.Poleski R.Runnoe J.Scott B.Schimoia J.S.Shappee B.J.,Shivvers I.Simonian G.V.Siviero A.Somers G.Stevens D.J.,Strauss M.A.Tayar J.Tejos N.Treu T.Van Saders J.Vican L.,Villanueva S.Yuk H.Zakamska N.L.Zhu W.Anderson M.D.Arevalo P.,Bazhaw C.Bisogni S.Borman G.A.Bottorff M.C.Brandt W.N.,Breeveld A.A.Cackett E.M.Carini M.T.Crenshaw D.M.,De Lorenzo-caceres A.Dietrich M.Edelson R.Efimova N.V.Ely J.,Evans P.A.Ferland G.J.Flatland K.Gehrels N.Geier S.Gelbord J.M.,Grupe D.Gupta A.Hall P.B.Hicks S.Horenstein D.Horne K.,Hutchison T.Im M.Joner M.D.Jones J.Kaastra J.Kaspi S.,Kelly B.C.Kennea J.A.Kim M.Kim S.C.Klimanov S.A.Lee J.C.,Leonard D.C.Lira P.Macinnis F.Mathur S.Mchardy I.M.Montouri C.,Musso R.Nazarov S.V.Netzer H.Norris R.P.Nousek J.A.Okhmat D.N.,Papadakis I.Parks J.R.Pott J.-U.Rafter S.E.Rix H.-W.Saylor D.A.,Schnulle K.Sergeev S.G.Siegel M.Skielboe A.Spencer M.Starkey D.,Sung H.-I.Teems K.G.Turner C.S.Uttley P.Villforth C.Weiss Y.,Woo J.-H.Yan H.Young S.Zu Y.2018-03-12T08:28:39Z2017-11-27T14:27:44ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleispectroscopyWe present the results of an optical spectroscopic monitoring program targeting NGC 5548 as part of a larger multiwavelength reverberation mapping campaign. The campaign spanned 6 months and achieved an almost daily cadence with observations from five ground-based telescopes. The H{beta} and HeII{lambda}4686 broad emission-line light curves lag that of the 5100{AA} optical continuum by 4.17_-0.36_^+0.36^days and 0.79_-0.34_^+0.35^days, respectively. The H{beta} lag relative to the 1158{AA} ultraviolet continuum light curve measured by the Hubble Space Telescope is ~50% longer than that measured against the optical continuum, and the lag difference is consistent with the observed lag between the optical and ultraviolet continua. This suggests that the characteristic radius of the broad-line region is ~50% larger than the value inferred from optical data alone. We also measured velocity-resolved emission-line lags for H{beta} and found a complex velocity-lag structure with shorter lags in the line wings, indicative of a broad-line region dominated by Keplerian motion. The responses of both the H{beta} and He II emission lines to the driving continuum changed significantly halfway through the campaign, a phenomenon also observed for CIV, Ly{alpha}, HeII(+OIII]), and SiIV(+OIV]) during the same monitoring period. Finally, given the optical luminosity of NGC5548 during our campaign, the measured H{beta} lag is a factor of five shorter than the expected value implied by the R_BLR_-L_AGN_ relation based on the past behavior of NGC 5548.2017ApJ...837..131Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/837/131CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/115/185 : 3C 390.3 BVRI and H photometry (Dietrich+, 1998)J/ApJ/510/659 : Size and Structure of AGN in NGC 5548 (Peterson+, 1999)J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)J/A+A/417/515 : I Zw 1 unusual emission line spectrum (Veron-Cetty+, 2004)J/ApJ/622/129 : Lag-luminosity relationship in AGN (Sergeev+, 2005)J/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 2009)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/732/121 : V-band and H{beta} monitoring of Z299-15 (Barth+, 2011)J/ApJ/779/109 : Long-term monitoring of NGC 5548 (Peterson+, 2013)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/806/128 : Space telescope RM project. I. NGC5548 (De Rosa+, 2015)J/ApJ/806/22 : SEAMBHs IV. H{beta} time lags (Du+, 2015)J/ApJ/806/129 : Space telescope RM project. II. Swift data (Edelson+, 2015)J/ApJ/821/56 : Space tel. RM project. III. NGC 5548 LCs (Fausnaugh+, 2016)J/ApJ/827/118 : A new reverberation mapping campain on NGC 5548 (Lu+, 2016)J/ApJ/818/30 : Lag measurements for z<0.8 QSOs from the SDSS-RM (Shen+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/837/131https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/837/131http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/837/131https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/837/131https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/837/131http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/837/131GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap3.8949892233750168e-19 3.8949892233750168e-19OpticaldefaultJ/ApJ/837/131/table2Flux measurements for continuum and emission linesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Date; JD-2450000dtime.epochfloatTelTelescope code (1)meta.code;instr.telcharF5100[10/13.5] Flux density at 5100{AA} (2)1e-15cW.m**-2.nm**-1phot.fluxfloate_F5100[0.03/0.1] Uncertainty in F5100 (2)1e-15cW.m**-2.nm**-1stat.errorfloatFHb[661/822] Linear continuum model H{beta} emission-line flux density (3)1e-15mW.m**-2phot.fluxfloate_FHb[2/8] Uncertainty in FHb (3)1e-15mW.m**-2stat.errorfloatFHbSD[656/803]? Spectral decomposition method H{beta} emission-line flux density (3)1e-15mW.m**-2phot.fluxfloatnullablee_FHbSD[4/8]? Uncertainty in FHbSD (3)1e-15mW.m**-2stat.errorfloatnullableFHeIISD[21/163]? Spectral decomposition method HeII emission-line flux density (3)1e-15mW.m**-2phot.fluxfloatnullablee_FHeIISD[2/10]? Uncertainty in FHeIISD (3)1e-15mW.m**-2stat.errorfloatnullable