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• W1489364622 abstract "view Abstract Citations (302) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. II. an Intensive Study of NGC 5548 at Optical Wavelengths Peterson, B. M. ; Balonek, T. J. ; Barker, E. S. ; Bechtold, J. ; Bertram, R. ; Bochkarev, N. G. ; Bolte, M. J. ; Bond, D. ; Boroson, T. A. ; Carini, M. T. ; Carone, T. E. ; Christensen, J. A. ; Clements, S. D. ; Cochran, A. L. ; Cohen, R. D. ; Crampton, D. ; Dietrich, M. ; Elvis, M. ; Ferguson, A. ; Filippenko, A. V. ; Fricke, K. J. ; Gaskell, C. M. ; Halpern, J. P. ; Huchra, J. P. ; Hutchings, J. B. ; Kollatschny, W. ; Koratkar, A. P. ; Korista, K. T. ; Krolik, J. H. ; Lame, N. J. ; Laor, A. ; Leacock, R. J. ; MacAlpine, G. M. ; Malkan, M. A. ; Maoz, D. ; Miller, H. R. ; Morris, S. L. ; Netzer, H. ; Oliveira, C. L. M. ; Penfold, J. ; Penston, M. V. ; Perez, E. ; Pogge, R. W. ; Richmond, M. W. ; Romanishin, W. ; Rosenblatt, E. I. ; Saddlemyer, L. ; Sadun, A. ; Sawyer, S. R. ; Shields, J. C. and 14 more Abstract We report on a large, international program of ground-based optical spectroscopy and photometry of the variable Seyfert 1 galaxy NGC 5548 undertaken in support of an IUE monitoring campaign described by Clavel and coworkers. In this contribution, we present the data base and describe the methods used to correct for systematic differences between spectra from different sources. Optical continuum and Hβ emission-line light curves are derived from the spectra. The behavior of the optical continuum is qualitatively the same as the behavior of the ultraviolet continuum. Cross-correlation of the ultraviolet and optical continuum measurements does not reveal any significant lag between them. The Hβ emission-line variations show the same basic pattern as seen in the continuum and ultraviolet emission lines, with Hβ lagging behind the continuum by ~ 20 days. This is significantly larger than the ~ 10 day lag deduced for Lyα. Publication: The Astrophysical Journal Pub Date: February 1991 DOI: 10.1086/169675 Bibcode: 1991ApJ...368..119P Keywords: Active Galactic Nuclei; Galactic Structure; Seyfert Galaxies; Astronomical Photometry; Astronomical Spectroscopy; Emission Spectra; Iue; Light Curve; Visible Spectrum; Astronomy; GALAXIES: INDIVIDUAL NGC NUMBER: NGC 5548; GALAXIES: SEYFERT; SPECTROPHOTOMETRY full text sources ADS | data products SIMBAD (1) NED (1) MAST (1) Related Materials (14) Part 1: 1991ApJ...366...64C Part 3: 1992ApJ...392..470P Part 4: 1993ApJ...408..416D Part 5: 1994ApJ...425..582R Part 6: 1994ApJ...425..609S Part 7: 1994ApJ...425..622P Part 8: 1995ApJS...97..285K Part 9: 1997ApJS..110....9R Part 10: 1997ApJS..112..271S Part 11: 1997ApJS..113...69W Part 12: 1998ApJS..115..185D Part 13: 1998ApJ...509..163O Part 14: 1998ApJ...500..162C Part 15: 1999ApJ...510..659P" @default.
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• W1489364622 date "1991-02-01" @default.
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• W1489364622 title "Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. II - an intensive study of NGC 5548 at optical wavelengths" @default.
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