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dc.contributor.authorDietrich, M.
dc.contributor.authorKollatschny, W.
dc.contributor.authorPeterson, B. M.
dc.contributor.authorBechtold, J.
dc.contributor.authorBertram, R.
dc.contributor.authorBochkarev, N. G.
dc.contributor.authorBoroson, T. A.
dc.contributor.authorCarone, T. E.
dc.contributor.authorElvis, Martin S.
dc.contributor.authorFilippenko, A. V.
dc.contributor.authorGaskell, C. M.
dc.contributor.authorHuchra, J
dc.contributor.authorHutchings, J. B.
dc.contributor.authorKoratkar, A. P.
dc.contributor.authorKorista, K. T.
dc.contributor.authorLame, N. J.
dc.contributor.authorLaor, A.
dc.contributor.authorMacAlpine, G. M.
dc.contributor.authorMalkan, M. A.
dc.contributor.authorMendes de Oliveira, C.
dc.contributor.authorNetzer, H.
dc.contributor.authorPenfold, J.
dc.contributor.authorPenston, M. V.
dc.contributor.authorPerez, E.
dc.contributor.authorPogge, R. W.
dc.contributor.authorRichmond, M. W.
dc.contributor.authorRosenblatt, E. I.
dc.contributor.authorShapovalova, A. I.
dc.contributor.authorShields, J. C.
dc.contributor.authorSmith, H. A.
dc.contributor.authorSmith, P. S.
dc.contributor.authorSun, W.-H.
dc.contributor.authorThiele, U.
dc.contributor.authorVeilleux, S.
dc.contributor.authorWagner, R. M.
dc.contributor.authorWilkes, Belinda Jane
dc.contributor.authorWills, B. J.
dc.contributor.authorWills, D.
dc.date.accessioned2017-02-13T16:47:34Z
dc.date.issued1993
dc.identifier.citationDietrich, M., W. Kollatschny, B. M. Peterson, J. Bechtold, R. Bertram, N. G. Bochkarev, T. A. Boroson, et al. 1993. “Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. IV - Intensity Variations of the Optical Emission Lines of NGC 5548.” The Astrophysical Journal 408 (May): 416. doi:10.1086/172599.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:30212181
dc.description.abstractMeasurements of optical emission-line flux variations based on spectra of the Seyfert galaxy NGC 5548 obtained between December 1988 and October 1989 are reported. All of the measured optical emission lines, H-alpha, H-beta, H-gamma, He I 5876, and He II 4686, exhibit the same qualitative behavior as the UV and optical continua, but with short time delays, or lags, which are different for the various lines. Cross-correlation analysis is applied to measure the lags between the various lines and the continuum. Similar lags are found with respect to the UV continuum for H-alpha and H-beta, 17 and 19 d, respectively. The lag for H-gamma is shorter (13 d), only somewhat larger than the lag measured for Ly-alpha (about 10 d). The helium lines respond to continuum variations more rapidly than the hydrogen lines, with lags of about 7 d for He II 4686 and 11 d for He I 5876.en_US
dc.description.sponsorshipAstronomyen_US
dc.language.isoen_USen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionofdoi:10.1086/172599en_US
dc.relation.hasversionhttp://adsabs.harvard.edu/abs/1993ApJ...408..416Den_US
dash.licenseLAA
dc.subjectActive Galactic Nucleien_US
dc.subjectEmission Spectraen_US
dc.subjectGalactic Structureen_US
dc.subjectLuminous Intensityen_US
dc.subjectOptical Emission Spectroscopyen_US
dc.subjectSeyfert Galaxiesen_US
dc.subjectH Alpha Lineen_US
dc.subjectH Beta Lineen_US
dc.subjectH Gamma Lineen_US
dc.subjectLight Curveen_US
dc.subjectLyman Spectraen_US
dc.subjectTime Series Analysisen_US
dc.subjectUltraviolet Spectraen_US
dc.titleSteps toward determination of the size and structure of the broad-line region in active galactic nuclei. IV - Intensity variations of the optical emission lines of NGC 5548en_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalThe Astrophysical Journalen_US
dash.depositing.authorWilkes, Belinda Jane
dc.date.available2017-02-13T16:47:34Z
dc.identifier.doi10.1086/172599*
dash.authorsorderedfalse
dash.contributor.affiliatedElvis, Martin
dash.contributor.affiliatedHuchra, John
dash.contributor.affiliatedWilkes, Belinda


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