J/ApJ/948/85ivo://CDS.VizieR/J/ApJ/948/85doi:10.26093/cds/vizier.19480085CDSHomayouni Y.De Rosa G.Plesha R.Kriss G.A.Barth A.J.Cackett E.M.,Horne K.Kara E.A.Landt H.Arav N.Boizelle B.D.Bentz M.C.,Brink T.G.Brotherton M.S.Chelouche D.Dalla Bonta E.Dehghanian M.,Du PuFerland G.J.Ferrarese L.Fian C.Filippenko A.V.Fischer T.,Foley R.J.Gelbord J.Goad M.R.Gonzalez Buitrago D.H.Gorjian V.,Grier C.J.Hall P.B.Hernandez Santisteban J.V.Hu C.Ilic D.,Joner M.D.Kaastra J.Kaspi S.Kochanek C.S.Korista K.T.,Kovacevic A.B.Kynoch D.Li Y.-R.McHardy I.M.McLane J.N.,Mehdipour M.Miller J.A.Mitchell J.Montano J.Netzer H.,Panagiotou C.Partington E.Pogge R.W.Popovic L. CProga D.,Rogantini D.Storchi-Bergmann T.Sanmartim D.Siebert M.R.Treu T.,Vestergaard M.Wang J.-M.Ward M.J.Waters T.Williams P.R.,Zaidouni F.Zu Y.2025-08-11T20:15:13Z2025-07-17T09:20:35ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleispectroscopyultraviolet-astronomyWe present reverberation mapping measurements for the prominent ultraviolet broad emission lines of the active galactic nucleus Mrk817 using 165 spectra obtained with the Cosmic Origins Spectrograph on the Hubble Space Telescope. Our ultraviolet observations are accompanied by X-ray, optical, and near-infrared observations as part of the AGN Space Telescope and Optical Reverberation Mapping Program 2 (AGN STORM 2). Using the cross-correlation lag analysis method, we find significant correlated variations in the continuum and emission-line light curves. We measure rest-frame delayed responses between the far-ultraviolet continuum at 1180{AA} and Ly{alpha}{lambda}1215{AA} (10.4_-1.4_^+1.6^days), NV{lambda}1240{AA} (15.5_-4.8_^+1.0^days), SiIV+]OIV{lambda}1397{AA} (8.2_-1.4_^+1.4^days), CIV{lambda}1549{AA} (11.8_-2.8_^+3.0^days), and HeII{lambda}1640{AA} (9.0_-1.9_^+4.5^days) using segments of the emission-line profile that are unaffected by absorption and blending, which results in sampling different velocity ranges for each line. However, we find that the emission-line responses to continuum variations are more complex than a simple smoothed, shifted, and scaled version of the continuum light curve. We also measure velocity-resolved lags for the Ly{alpha} and CIV emission lines. The lag profile in the blue wing of Ly{alpha} is consistent with virial motion, with longer lags dominating at lower velocities, and shorter lags at higher velocities. The CIV lag profile shows the signature of a thick rotating disk, with the shortest lags in the wings, local peaks at +/-1500km/s, and a local minimum at the line center. The other emission lines are dominated by broad absorption lines and blending with adjacent emission lines. These require detailed models, and will be presented in future work.2023ApJ...948...85Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/948/85CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)B/xmm : XMM-Newton Observation Log (XMM-Newton Science Operation Center, 2012-)J/A+A/639/L13 : 4C 41.17 IRAM/NOEMA data cubes (Nesvadba+, 2020))J/ApJS/105/369 : Galactic H I column densities (Murphy+ 1996)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/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)J/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 2009)J/ApJ/732/121 : V-band and H{beta} monitoring of Z299-15 (Barth+, 2011)J/ApJ/753/106 : Quasar variability with SDSS and POSS imaging (MacLeod+, 2012)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/806/129 : Space telescope RM project. II. Swift data (Edelson+, 2015)J/ApJ/821/56 : Space telescope RM project. III. LCs (Fausnaugh+, 2016)J/ApJ/851/21 : SDSS RM project first year of observations (Grier+, 2017)J/ApJ/837/131 : Space telescope RM project. V. NGC5548 sp. (Pei+, 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/881/153 : Space telescope RM project. VIII. HST sp. (Kriss+, 2019)J/ApJ/905/77 : Monitoring AGNs with Hb Asymmetry. II. (Brotherton+, 2020)J/ApJ/890/71 : 5100{AA} cont. & emission lines LCs of PG2130+099 (Hu+, 2020)J/ApJS/262/14 : AGNs with H{beta} asymmetry. III. 15 PG quasars (Bao+, 2022)J/ApJ/925/52 : LAMP 2016: velocity-resolved Hb lags in Seyfert (U+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/948/85https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/948/85http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/948/85https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/948/85https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/948/85http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/948/85GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVdefaultJ/ApJ/948/85/table4Continuum light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[59177.7/59634.4] Mid-point of G130M and G160M observations, HJD-2400000dtime.epochdoubleF1180[42/110] F1180 Continuum FLux, 10^-15^ergs/s/cm2/{AA}1e-17W.m**-2.nm**-1phot.flux;spect.continuum;em.UV.100-200nmfloate_F1180[0.3/0.8] Error in F1180 Continuum FLux1e-17W.m**-2.nm**-1stat.error;phot.flux;spect.continuumfloatF1398[38.8/89] F1398 Continuum Flux, 10^-15^ergs/s/cm2/{AA}1e-17W.m**-2.nm**-1phot.flux;spect.continuum;em.UV.100-200nmfloate_F1398[0.3/0.5] Error in F1398 Continuum Flux1e-17W.m**-2.nm**-1stat.error;phot.flux;spect.continuumfloatF1502[34.3/80] F1502 Continuum Flux, 10^-15^ergs/s/cm2/{AA}1e-17W.m**-2.nm**-1phot.flux;spect.continuum;em.UV.100-200nmfloate_F1502[0.2/0.4] Error in F1502 Continuum Flux1e-17W.m**-2.nm**-1stat.error;phot.flux;spect.continuumfloatF1739[28/69] F1739 Continuum Flux, 10^-15^ergs/s/cm2/{AA}1e-17W.m**-2.nm**-1phot.flux;spect.continuum;em.UV.100-200nmfloate_F1739[1/1.8] Error in F1739 Continuum Flux1e-17W.m**-2.nm**-1stat.error;phot.flux;spect.continuumfloatJ/ApJ/948/85/table5Emission-line light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[59177.7/59634.4] Mid-point of G130M and G160M observations, HJD-2400000dtime.epochdoubleLya[7.6/16.2] Integrated Ly{alpha} Line FLux, 10^-13^erg/s/cm2 (1)1e-13mW.m**-2phot.flux;em.line.Lyalphafloate_Lya[0.06/0.2] Error in integrated Line FLux1e-13mW.m**-2stat.error;phot.flux;em.line.LyalphafloatNV[10.3/22.3] Integrated NV Line FLux, 10^-13^erg/s/cm2 (1)1e-13mW.m**-2phot.flux;em.linefloate_NV[0.08/0.2] Error in integrated Line FLux1e-13mW.m**-2stat.error;phot.flux;em.linefloatSiIV+OIV[3.5/8.5] Integrated SiIV+OIV Line FLux, 10^-13^erg/s/cm2 (1)1e-13mW.m**-2phot.flux;em.linefloate_SiIV+OIV[0.09/0.2] Error in integrated Line FLux1e-13mW.m**-2stat.error;phot.flux;em.linefloatCIV[17.5/29.1] Integrated C IV Line FLux, 10^-13^erg/s/cm2 (1)1e-13mW.m**-2phot.flux;em.linefloate_CIV[0.2/0.4] Error in integrated Line FLux1e-13mW.m**-2stat.error;phot.flux;em.linefloatHeII[1.6/4] Integrated He II Line FLux, 10^-13^erg/s/cm2 (1)1e-13mW.m**-2phot.flux;em.linefloate_HeII[0.15/0.3] Error in integrated Line FLux1e-13mW.m**-2stat.error;phot.flux;em.linefloat