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dc.contributor.authorPeterson, B. M.
dc.contributor.authorBerlind, Perry
dc.contributor.authorBertram, R.
dc.contributor.authorBochkarev, N. G.
dc.contributor.authorBond, D.
dc.contributor.authorBrotherton, M. S.
dc.contributor.authorBusler, J. R.
dc.contributor.authorChuvaev, K. K.
dc.contributor.authorCohen, R. D.
dc.contributor.authorDietrich, M.
dc.contributor.authorElvis, Martin S.
dc.contributor.authorFilippenko, A. V.
dc.contributor.authorFoltz, C. B.
dc.contributor.authorGarnavich, P. M.
dc.contributor.authorHo, L. C.
dc.contributor.authorHorine, E.
dc.contributor.authorHorne, K.
dc.contributor.authorHuchra, J
dc.contributor.authorKollatschny, W.
dc.contributor.authorKorista, K. T.
dc.contributor.authorMalkan, M. A.
dc.contributor.authorMatheson, T.
dc.contributor.authorMignoli, M.
dc.contributor.authorMorris, S. L.
dc.contributor.authorNazarova, L.
dc.contributor.authorPenfold, J.
dc.contributor.authorPeters, J.
dc.contributor.authorPogge, R. W.
dc.contributor.authorPronik, V. I.
dc.contributor.authorRush, B.
dc.contributor.authorSergeev, S. G.
dc.contributor.authorShapovalova, A. I.
dc.contributor.authorShields, J. C.
dc.contributor.authorStirpe, G. M.
dc.contributor.authorTokarz, S.
dc.contributor.authorWagner, Rudolf
dc.contributor.authorWeymann, R. J.
dc.contributor.authorWhite, R. J.
dc.contributor.authorWilkes, Belinda Jane
dc.contributor.authorWills, D.
dc.contributor.authorWills, B. J.
dc.contributor.authorWinge, C.
dc.contributor.authorYounger, P. F.
dc.date.accessioned2017-06-08T20:51:14Z
dc.date.issued1994
dc.identifierQuick submit: 2017-02-08T11:23:34-0500
dc.identifier.citationPeterson, B. M., P. Berlind, R. Bertram, N. G. Bochkarev, D. Bond, M. S. Brotherton, J. R. Busler, et al. 1994. “Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Nuclei. 7: Variability of the Optical Spectrum of NGC 5548 over Years.” The Astrophysical Journal 425 (April): 622. doi:10.1086/174009.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:32955265
dc.description.abstractWe report on the results of a continuation of a large monitoring program of optical spectroscopy of the Seyfert 1 galaxy NGC 5548. The new observations presented here were obtained between 1990 December and 1992 October, and extend the existing database to nearly 1400 days, dating back to 1988 December. The continuum variations are generally smooth and well-resolved, except during the third year of this 4 year project, when the variations were apparently more rapid and of lower amplitude than observed at other times. The broad H(beta) emission line is found to vary in response to the continuum variations with a lag of about 18 days, but with some changes from year to year. The H(beta) transfer functions for each of the 4 yr and for the entire 4 yr database are derived by using a maximum entropy method.en_US
dc.description.sponsorshipAstronomyen_US
dc.language.isoen_USen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionof10.1086/174009en_US
dash.licenseLAA
dc.subjectgalaxies: activeen_US
dc.subjectgalaxies: individual (NGC 5548)en_US
dc.subjectgalaxies: nucleien_US
dc.subjectgalaxies: Seyferten_US
dc.titleSteps toward determination of the size and structure of the broad-line region in active nuclei. 7: Variability of the optical spectrum of NGC 5548 over yearsen_US
dc.typeJournal Articleen_US
dc.date.updated2017-02-08T16:23:46Z
dc.description.versionVersion of Recorden_US
dc.relation.journalThe Astrophysical Journalen_US
dash.depositing.authorWilkes, Belinda Jane
dc.date.available1994
dc.date.available2017-06-08T20:51:14Z
dc.identifier.doi10.1086/174009*
dash.authorsorderedfalse
dash.contributor.affiliatedBerlind, Perry
dash.contributor.affiliatedElvis, Martin
dash.contributor.affiliatedHuchra, John
dash.contributor.affiliatedWilkes, Belinda


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