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

Bibcode
1991ApJ...368..119P
DOI
10.1086/169675
Bechtold, J.; Barker, E. S.; Balonek, T. J.; Peterson, B. M.; Younger, P. F.; Wills, D.; Wills, B. J.; Wilkes, B. J.; Weymann, R. J.; Turner, T. J.; Veilleux, S.; Wagner, R. M.; Smith, H. A.; Smith, P. S.; Sun, W.-H.; Thiele, U.; Shapovalova, A. I.; Smith, A. G.; Saddlemyer, L.; Sadun, A.; Sawyer, S. R.; Shields, J. C.; Richmond, M. W.; Romanishin, W.; Rosenblatt, E. I.; Pogge, R. W.; Penfold, J.; Penston, M. V.; Perez, E.; Netzer, H.; Oliveira, C. L. M.; 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.; Cochran, A. L.; Cohen, R. D.; Crampton, D.; Christensen, J. A.; Clements, S. D.; Carini, M. T.; Carone, T. E.; Bond, D.; Boroson, T. A.; Bochkarev, N. G.; Bolte, M. J.; Bertram, R.
Bibliographical reference

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. 119-137. Research supported by NSERC, American Astronomical Society, and USIBSF.

Advertised on:
2
1991
Journal
Astrophysical Journal
Number of authors
64
IAC number of authors
1
Citations
308
Refereed citations
259
Description
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 is described. This contribution presents the data base and describes the methods used to correct for systematic differences between spectra from different sources. Optical continuum and H-beta 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 h-beta emission-line variations show the same basic pattern as seen in the continuum and ultraviolet emission lines, with H-beta lagging behind the continuum by about 20 days. This is significantly larger than the about 10 day lag deduced for Ly-alpha.
Type
Refereed
Active galactic nuclei
Seyfert galaxies

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