J/ApJ/821/56ivo://CDS.VizieR/J/ApJ/821/56doi:10.26093/cds/vizier.18210056CDSFausnaugh M.M.Denney K.D.Barth A.J.Bentz M.C.Bottorff M.C.,Carini M.T.Croxall K.V.De Rosa G.Goad M.R.Horne K.Joner M.D.,Kaspi S.Kim M.Klimanov S.A.Kochanek C.S.Leonard D.C.Netzer H.,Peterson B.M.Schnulle K.Sergeev S.G.Vestergaard M.Zheng W.Zu Y.,Anderson M.D.Arevalo P.Bazhaw C.Borman G.A.Boroson T.A.,Brandt W.N.Breeveld A.A.Brewer B.J.Cackett E.M.Crenshaw D.M.,Dalla Bonta E.De Lorenzo-Caceres A.Dietrich M.Edelson R.,Efimova N.V.Ely J.Evans P.A.Filippenko A.V.Flatland K.Gehrels N.,Geier S.Gelbord J.M.Gonzalez L.Gorjian V.Grier C.J.Grupe D.,Hall P.B.Hicks S.Horenstein D.Hutchison T.Im M.Jensen J.J.,Jones J.Kaastra J.Kelly B.C.Kennea J.A.Kim S.C.Korista K.T.,Kriss G.A.Lee J.C.Lira P.MacInnis F.Manne-Nicholas E.R.Mathur S.,McHardy I.M.Montouri C.Musso R.Nazarov S.V.Norris R.P.,Nousek J.A.Okhmat D.N.Pancoast A.Papadakis I.Parks J.R.Pei L.,Pogge R.W.Pott J.-U.Rafter S.E.Rix H.Saylor D.A.Schimoia J.S.,Siegel M.Spencer M.Starkey D.Sung H.Teems K.G.Treu T.,Turner C.S.Uttley P.Villforth C.Weiss Y.Woo J.Yan H.Young S.2017-06-19T07:58:11Z2016-08-24T07:32:05ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryinfrared-photometryvisible-astronomybroad-band-photometryultraviolet-photometryWe present ground-based optical photometric monitoring data for NGC5548, part of an extended multiwavelength reverberation mapping campaign. The light curves have nearly daily cadence from 2014 January to July in nine filters (BVRI and ugriz). Combined with ultraviolet data from the Hubble Space Telescope and Swift, we confirm significant time delays between the continuum bands as a function of wavelength, extending the wavelength coverage from 1158{AA} to the z band (~9160{AA}). We find that the lags at wavelengths longer than the V band are equal to or greater than the lags of high-ionization-state emission lines (such as HeII{lambda}1640 and {lambda}4686), suggesting that the continuum-emitting source is of a physical size comparable to the inner broad-line region (BLR). The trend of lag with wavelength is broadly consistent with the prediction for continuum reprocessing by an accretion disk with {tau}{propto}{lambda}^4/3^. However, the lags also imply a disk radius that is 3 times larger than the prediction from standard thin-disk theory, assuming that the bolometric luminosity is 10% of the Eddington luminosity (L=0.1L_Edd_). Using optical spectra from the Large Binocular Telescope, we estimate the bias of the interband continuum lags due to BLR emission observed in the filters. We find that the bias for filters with high levels of BLR contamination (~20%) can be important for the shortest continuum lags and likely has a significant impact on the u and U bands owing to Balmer continuum emission.2016ApJ...821...56Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/821/56CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/806/129 : Space telescope RM project. II. Swift data (Edelson+, 2015)J/ApJ/806/128 : Space telescope RM project. I. NGC5548 (De Rosa+, 2015)J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)J/ApJ/779/109 : Long-term monitoring of NGC 5548 (Peterson+, 2013)J/ApJ/716/993 : LAMP: reverberation mapping of H and He lines (Bentz+, 2010)J/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 2009)J/ApJ/622/129 : Lag-luminosity relationship in AGN (Sergeev+, 2005)J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)J/AJ/128/1761 : HATNET variability survey (Hartman+, 2004)J/A+A/422/925 : Profile variability in lines of NGC 5548 (Shapovalova+ 2004)J/A+A/371/79 : NGC 5548 UBVRI phot. and Halpha, Hbeta fluxes (Dietrich+, 2001)J/PAZh/27/942 : Nuclear activity of NGC 5548 (Doroshenko+, 2001)J/AJ/116/102 : NGC 5548 BR photometry (Tyson+ 1998)J/A+A/320/405 : NGC 5548 continuum light curve (Sergeev+ 1997)J/A+A/314/43 : NGC 5548 Profile variability (Kollatschny+ 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/821/56https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/821/56http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/821/56https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/821/56https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/821/56http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/821/56GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfraredOpticalUVdefaultJ/ApJ/821/56/table3Optical continuum light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFiltFilter (BVRIugriz)meta.id;instr.filtercharHJDHeliocentric Julian Date; HJD-2400000dtime.epochdoubleFlux[8/28] Flux in 10^-15^erg/cm^2^/s/{AA}1e-17W.m**-2.nm**-1phot.flux.density;em.optfloate_Flux[0.004/2.6] Uncertainty in Flux1e-17W.m**-2.nm**-1stat.error;phot.fluxfloatTelTelescope ID (1)meta.id;instr.telchardCTS[-121380/68575] Differential Countsctphot.countdoublee_dCTS[166/41497] Uncertainty in dCTSctstat.errordoubleJ/ApJ/821/56/table4HST/COS continuum light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[1157.5/1746] HST COS wavelength0.1nmem.wlfloatHJDHeliocentric Julian Date; HJD-2400000dtime.epochdoubleFlux[17/73] Flux in 10^-15^erg/cm^2^/s/{AA}1e-17W.m**-2.nm**-1phot.flux.density;em.optfloate_Flux[0.3/1.4] Uncertainty in Flux1e-17W.m**-2.nm**-1stat.error;phot.fluxfloat