J/ApJ/806/128ivo://CDS.VizieR/J/ApJ/806/128doi:10.26093/cds/vizier.18060128CDSDe Rosa G.Peterson B.M.Ely J.Kriss G.A.Crenshaw D.M.Horne K.,Korista K.T.Netzer H.Pogge R.W.Arevalo P.Barth A.J.Bentz M.C.,Brandt W.N.Breeveld A.A.Brewer B.J.Dalla Bonta E.,De Lorenzo-Caceres A.Denney K.D.Dietrich M.Edelson R.Evans P.A.,Fausnaugh M.M.Gehrels N.Gelbord J.M.Goad M.R.Grier C.J.Grupe D.,Hall P.B.Kaastra J.Kelly B.C.Kennea J.A.Kochanek C.S.Lira P.,Mathur S.Mchardy I.M.Nousek J.A.Pancoast A.Papadakis I.Pei L.,Schimoia J.S.Siegel M.Starkey D.Treu T.Uttley P.Vaughan S.,Vestergaard M.Villforth C.Yan H.Young S.Zu Y.2017-06-30T05:48:23Z2015-11-17T15:18:28ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleispectroscopyultraviolet-astronomyWe describe the first results from a six-month long reverberation-mapping experiment in the ultraviolet based on 171 observations of the Seyfert 1 galaxy NGC 5548 with the Cosmic Origins Spectrograph on the Hubble Space Telescope. Significant correlated variability is found in the continuum and broad emission lines, with amplitudes ranging from ~30% to a factor of two in the emission lines and a factor of three in the continuum. The variations of all the strong emission lines lag behind those of the continuum, with HeII{lambda}1640 lagging behind the continuum by ~2.5 days and Ly{alpha}{lambda}1215, CIV{lambda}1550, and SiIV{lambda}1400 lagging by ~5-6 days. The relationship between the continuum and emission lines is complex. In particular, during the second half of the campaign, all emission-line lags increased by a factor of 1.3-2 and differences appear in the detailed structure of the continuum and emission-line light curves. Velocity-resolved cross-correlation analysis shows coherent structure in lag versus line of sight velocity for the emission lines; the high-velocity wings of CIV respond to continuum variations more rapidly than the line core, probably indicating higher velocity broad-line region clouds at smaller distances from the central engine. The velocity-dependent response of Ly{alpha}, however, is more complex and will require further analysis.2015ApJ...806..128Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/806/128CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)J/ApJ/806/129 : Space telescope RM project. II. Swift data (Edelson+, 2015)J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)J/ApJS/216/4 : SDSS-RM project: technical overview (Shen+, 2015)J/ApJ/805/96 : SDSS-RM project: velocity dispersions of QSOs (Shen+, 2015)J/ApJ/779/109 : Long-term monitoring of NGC 5548 (Peterson+, 2013)J/ApJ/755/60 : Reverberation mapping for 5 Seyfert 1 galaxies (Grier+, 2012)J/ApJ/753/L2 : Reverberation mapping of AGNs (Assef+, 2012)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/ApJ/716/993 : LAMP: reverberation mapping of H and He lines (Bentz+, 2010)J/ApJ/699/800 : Mass functions of active black holes (Vestergaard+, 2009)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/A+A/422/925 : Profile variability in lines of NGC 5548 (Shapovalova+ 2004)J/ApJ/599/886 : Emission lines of radio-loud AGN (Eracleous+, 2003)J/AJ/126/1720 : ugriz and H{alpha} of double-peaked AGN (Strateva+, 2003)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/806/128https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/806/128http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/806/128https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/806/128https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/806/128http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/806/128GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVdefaultJ/ApJ/806/128/table2Continuum and emission-line light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD130Heliocentric Julian Date of the G130M observation (1)dtime.epochdoubleF1367[21.8/64.8] G130M 1367 Angstrom flux (2)1e-15cW.m**-2.nm**-1phot.fluxfloate_F1367[0.5/1] Uncertainty in F1367 (3)1e-15cW.m**-2.nm**-1stat.errorfloatFLya[34.3/46.9] G130M integrated Ly{alpha} line flux (4)1e-13mW.m**-2phot.fluxfloate_FLya[0.4/0.6] Uncertainty in FLya (3)1e-13mW.m**-2stat.errorfloatFNV[1.1/3.5] G130M integrated NV 1240{AA} line flux (4)1e-13mW.m**-2phot.flux;spect.linefloate_FNV[0.05/0.08] Uncertainty in FNUV (3)1e-13mW.m**-2stat.errorfloatFSiIV[3.2/6] G130M integrated SiIV 1400{AA} line flux (4)1e-13mW.m**-2phot.flux;spect.linefloate_FSiIV[0.1/0.4] Uncertainty in FSiIV (3)1e-13mW.m**-2stat.errorfloatHJD160Heliocentric Julian Date of the G160M observation (1)dtime.epochdoubleFCIV[47.2/63] G160M integrated CIV 1549{AA} line flux (4)1e-13mW.m**-2phot.flux;spect.linefloate_FCIV[0.7/1] Uncertainty in FCIV (3)1e-13mW.m**-2stat.errorfloatFHeII[5.4/10.7] G160M integrated HeII 1640{AA} line flux (4)1e-13mW.m**-2phot.flux;spect.linefloate_FHeII[0.2/0.5] Uncertainty in FHeII (3)1e-13mW.m**-2stat.errorfloat