J/ApJ/840/41ivo://CDS.VizieR/J/ApJ/840/41doi:10.26093/cds/vizier.18400041CDSEdelson R.Gelbord J.Cackett E.Connolly S.Done C.Fausnaugh M.,Gardner E.Gehrels N.Goad M.Horne K.McHardy I.Peterson B.M.,Vaughan S.Vestergaard M.Breeveld A.Barth A.J.Bentz M.Bottorff M.,Brandt W.N.Crawford S.M.Bonta E.D.Emmanoulopoulos D.Evans P.,Jaimes R.F.Filippenko A.V.Ferland G.Grupe D.Joner M.Kennea J.,Korista K.T.Krimm H.A.Kriss G.Leonard D.C.Mathur S.Netzer H.,Nousek J.Page K.Romero-Colmenero E.Siegel M.Starkey D.A.Treu T.,Vogler H.A.Winkler H.Zheng W.2018-03-12T09:27:02Z2018-01-19T13:23:18ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleivisible-astronomybroad-band-photometryultraviolet-photometryx-ray-sourcesSwift monitoring of NGC 4151 with an ~6hr sampling over a total of 69days in early 2016 is used to construct light curves covering five bands in the X-rays (0.3-50keV) and six in the ultraviolet (UV)/optical (1900-5500{AA}). The three hardest X-ray bands (>2.5keV) are all strongly correlated with no measurable interband lag, while the two softer bands show lower variability and weaker correlations. The UV/optical bands are significantly correlated with the X-rays, lagging ~3-4days behind the hard X-rays. The variability within the UV/optical bands is also strongly correlated, with the UV appearing to lead the optical by ~0.5-1days. This combination of >~3day lags between the X-rays and UV and <~1day lags within the UV/optical appears to rule out the "lamp-post" reprocessing model in which a hot, X-ray emitting corona directly illuminates the accretion disk, which then reprocesses the energy in the UV/optical. Instead, these results appear consistent with the Gardner & Done (2017MNRAS.470.3591G) picture in which two separate reprocessings occur: first, emission from the corona illuminates an extreme-UV-emitting toroidal component that shields the disk from the corona; this then heats the extreme-UV component, which illuminates the disk and drives its variability.2017ApJ...840...41Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/840/41CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/613/682 : AGN masses & broad-line region sizes (Peterson+, 2004)J/ApJ/622/129 : Lag-luminosity relationship in AGN (Sergeev+, 2005)J/ApJ/681/113 : Swift BAT survey of AGNs (Tueller+, 2008)J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)J/ApJ/713/L11 : X-ray properties of Seyfert 1 galaxies (Zhou+, 2010)J/ApJ/753/104 : AGN identifications from AKARI and Swift (Matsuta+, 2012)J/ApJ/754/45 : IR properties of Swift/BAT X-ray AGNs (Ichikawa+, 2012)J/MNRAS/433/1709 : PKS 0558-504 UVOT and XRT monitoring (Gliozzi+, 2013)J/ApJS/209/14 : The Swift/BAT hard X-ray transient monitor (Krimm+, 2013)J/A+A/563/A57 : Long-term variability of AGN at hard X-rays (Soldi+, 2014)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/ApJ/806/129 : Space telescope RM project. II. Swift data (Edelson+, 2015)J/ApJ/821/56 : Space telescope RM project. III. NGC 5548 (Fausnaugh+, 2016)J/A+A/588/A70 : Hard X-ray view of the soft excess in AGN (Boissay+, 2016)http://swift.gsfc.nasa.gov/results/transients/weak/NGC4151.lc.txt : Swift-BAThttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/840/41https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/840/41http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/840/41https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/840/41https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/840/41http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/840/41GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalUVX-raydefaultJ/ApJ/840/41/table3Swift/UVOT datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Date of mid-exposuredtime.epochdoubleFlux[2.9/7] Measured flux in Filt (1)1e-14cW.m**-2.nm**-1phot.flux.densitydoublee_Flux[0.05/0.2] 1{sigma} error in Flux (1)1e-14cW.m**-2.nm**-1stat.error;phot.fluxdoubleFiltFilter used (u, b, v, uvw1, uvm2 or uvw2) (2)instr.setup;instr.filtercharJ/ApJ/840/41/table4Swift/XRT datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Date of mid-exposuredtime.epochdoubleX1[0.04/0.3] Measured 0.3-1.25keV fluxct/sphot.count;em.X-raydoublee_X1The 1{sigma} error in X1ct/sstat.errordoubleX2[0.04/0.2] Measured 1.25-2.5keV fluxct/sphot.count;em.X-raydoublee_X2The 1{sigma} error in X2ct/sstat.errordoubleX3[0.1/1.2] Measured 2.5-5keV fluxct/sphot.count;em.X-raydoublee_X3The 1{sigma} error in X3ct/sstat.errordoubleX4[0.1/0.9] Measured 5-10keV fluxct/sphot.count;em.X-raydoublee_X4The 1{sigma} error in X4ct/sstat.errordoubleJ/ApJ/840/41/table5Swift/BAT datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochfloatFlux[0.003/0.01] Measured 15-50keV fluxct/sphot.count;em.X-raydoublee_Flux[0.0006/0.003] The 1{sigma} error in Fluxct/sstat.error;phot.fluxdouble