Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. 6: Variability of NGC 3783 from ground-based data

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dc.contributor.authorStirpe, G M
dc.contributor.authorWinge, C
dc.contributor.authorAltieri, B
dc.contributor.authorAlloin, D
dc.contributor.authorAguero, E L
dc.contributor.authorAnupama, G C
dc.contributor.authorAshley, R
dc.contributor.authorBertram, R
dc.contributor.authorCalderon, J H
dc.contributor.authorCatchpole, R M
dc.contributor.authorCorradi, R L M
dc.contributor.authorCovino, E
dc.contributor.authorDottori, H A
dc.contributor.authorFeast, M W
dc.contributor.authorGhosh, K K
dc.contributor.authorHutton, R Gil
dc.contributor.authorGlass, I S
dc.contributor.authorGrebel, E K
dc.contributor.authorJorda, L
dc.contributor.authorKoen, C
dc.contributor.authorLaney, C D
dc.contributor.authorMaia, M
dc.contributor.authorMarang, F
dc.contributor.authorMayya, Y D
dc.contributor.authorMorrell, N
dc.contributor.authorNakada, Y
dc.contributor.authorPastoriza, M G
dc.contributor.authorPati, A K
dc.contributor.authorPelat, D
dc.contributor.authorPeterson, B M
dc.contributor.authorPrabhu, T P
dc.contributor.authorRoberts, G
dc.date.accessioned2021-10-08T07:20:34Z
dc.date.available2021-10-08T07:20:34Z
dc.date.issued1994
dc.description.abstractThe Seyfert 1 galaxy NGC 3783 was intensely monitored in several bands between 1991 December and 1992 August. This paper presents the results from the ground-based observations in the optical and near-IR bands, which complement the data set formed by the International Ultraviolet Explorer (IUE) spectra, discussed elsewhere. Spectroscopic and photometric data from several observatories were combined in order to obtain well-sampled light curves of the continuum and of H(beta). During the campaign the source underwent significant variability. The light curves of the optical continuum and of H(beta) display strong similarities to those obtained with the IUE. The near-IR flux did not vary significantly except for a slight increase at the end of the campaign. The cross-correlation analysis shows that the variations of the optical continuum have a lag of 1 day or less with respect to those of the UV continuum, with an uncertainty of is less than or equal to 4 days. The integrated flux of H(beta) varies with a delay of about 8 days. These results confirm that (1) the continuum variations occur simultaneously or with a very small lag across the entire UV-optical range, as in the Seyfert galaxy NGC 5548; and (2) the emission lines of NGC 3783 respond to ionizing continuum variations with less delay than those of NGC 5548. As observed in NGC 5548, the lag of H(beta) with respect to the continuum is greater than those of the high-ionization lines.
dc.identifier.apacitationStirpe, G. M., Winge, C., Altieri, B., Alloin, D., Aguero, E. L., Anupama, G. C., ... Roberts, G. (1994). Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. 6: Variability of NGC 3783 from ground-based data. <i>The Astrophysical Journal</i>, 425(4), 609 - 177. http://hdl.handle.net/11427/34957en_ZA
dc.identifier.chicagocitationStirpe, G M, C Winge, B Altieri, D Alloin, E L Aguero, G C Anupama, R Ashley, et al "Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. 6: Variability of NGC 3783 from ground-based data." <i>The Astrophysical Journal</i> 425, 4. (1994): 609 - 177. http://hdl.handle.net/11427/34957en_ZA
dc.identifier.citationStirpe, G.M., Winge, C., Altieri, B., Alloin, D., Aguero, E.L., Anupama, G.C., Ashley, R. & Bertram, R. et al. 1994. Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. 6: Variability of NGC 3783 from ground-based data. <i>The Astrophysical Journal.</i> 425(4):609 - 177. http://hdl.handle.net/11427/34957en_ZA
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.ris TY - Journal Article AU - Stirpe, G M AU - Winge, C AU - Altieri, B AU - Alloin, D AU - Aguero, E L AU - Anupama, G C AU - Ashley, R AU - Bertram, R AU - Calderon, J H AU - Catchpole, R M AU - Corradi, R L M AU - Covino, E AU - Dottori, H A AU - Feast, M W AU - Ghosh, K K AU - Hutton, R Gil AU - Glass, I S AU - Grebel, E K AU - Jorda, L AU - Koen, C AU - Laney, C D AU - Maia, M AU - Marang, F AU - Mayya, Y D AU - Morrell, N AU - Nakada, Y AU - Pastoriza, M G AU - Pati, A K AU - Pelat, D AU - Peterson, B M AU - Prabhu, T P AU - Roberts, G AB - The Seyfert 1 galaxy NGC 3783 was intensely monitored in several bands between 1991 December and 1992 August. This paper presents the results from the ground-based observations in the optical and near-IR bands, which complement the data set formed by the International Ultraviolet Explorer (IUE) spectra, discussed elsewhere. Spectroscopic and photometric data from several observatories were combined in order to obtain well-sampled light curves of the continuum and of H(beta). During the campaign the source underwent significant variability. The light curves of the optical continuum and of H(beta) display strong similarities to those obtained with the IUE. The near-IR flux did not vary significantly except for a slight increase at the end of the campaign. The cross-correlation analysis shows that the variations of the optical continuum have a lag of 1 day or less with respect to those of the UV continuum, with an uncertainty of is less than or equal to 4 days. The integrated flux of H(beta) varies with a delay of about 8 days. These results confirm that (1) the continuum variations occur simultaneously or with a very small lag across the entire UV-optical range, as in the Seyfert galaxy NGC 5548; and (2) the emission lines of NGC 3783 respond to ionizing continuum variations with less delay than those of NGC 5548. As observed in NGC 5548, the lag of H(beta) with respect to the continuum is greater than those of the high-ionization lines. DA - 1994 DB - OpenUCT DP - University of Cape Town IS - 4 J1 - The Astrophysical Journal LK - https://open.uct.ac.za PY - 1994 SM - 0004-637X SM - 1538-4357 T1 - Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. 6: Variability of NGC 3783 from ground-based data TI - Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. 6: Variability of NGC 3783 from ground-based data UR - http://hdl.handle.net/11427/34957 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34957
dc.identifier.vancouvercitationStirpe GM, Winge C, Altieri B, Alloin D, Aguero EL, Anupama GC, et al. Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. 6: Variability of NGC 3783 from ground-based data. The Astrophysical Journal. 1994;425(4):609 - 177. http://hdl.handle.net/11427/34957.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Astronomy
dc.publisher.facultyFaculty of Science
dc.sourceThe Astrophysical Journal
dc.source.journalissue4
dc.source.journalvolume425
dc.source.pagination609 - 177
dc.source.urihttps://dx.doi.org/10.1086/174008
dc.subject.otherGalaxies: active
dc.subject.otherEspectros astronômicos
dc.subject.otherGaláxia NGC 3783
dc.subject.otherGalaxies: individual (NGC 3783)
dc.subject.otherGalaxies: nuclei
dc.subject.otherNucleo galatico
dc.subject.otherGalaxias seyfert
dc.subject.otherGalaxies: photometry
dc.subject.otherFotometria astronômica
dc.subject.otherGalaxies: seyfert
dc.subject.otherObservações astronômicas no visível
dc.subject.otherArtigo de periódico
dc.titleSteps toward determination of the size and structure of the broad-line region in active galactic nuclei. 6: Variability of NGC 3783 from ground-based data
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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