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 | Zendy

B. M. Peterson | Zendy; T. J. Balonek | Zendy; E. S. Barker | Zendy; Jill Bechtold | Zendy; R. Bertram | Zendy; N. G. Bochkarev | Zendy; M. Bolte | Zendy; D. Bond | Zendy; Todd A. Boroson | Zendy; M. T. Carini | Zendy; T. E. Carone | Zendy; J. A. Christensen | Zendy; S. D. Clements | Zendy; A. L. Cochran | Zendy; R. D. Cohen | Zendy; D. Crampton | Zendy; M. Dietrich | Zendy; M. Elvis | Zendy; A. M. N. Ferguson | Zendy; A. V. Filippenko | Zendy; K. J. Fricke | Zendy; C. M. Gaskell | Zendy; J. P. Halpern | Zendy; J. P. Huchra | Zendy; J. B. Hutchings | Zendy; W. Kollatschny | Zendy; Anuradha Koratkar | Zendy; K. T. Korista | Zendy; Julian H. Krolik | Zendy; N. J. Lame | Zendy; Ari Laor | Zendy; R. J. Leacock | Zendy; G. M. MacAlpine | Zendy; M. A. Malkan | Zendy; Dan Maoz | Zendy; H. R. Miller | Zendy; S. L. Morris | Zendy; H. Netzer | Zendy; Claudia L. Mendes de Oliveira | Zendy; J. E. Penfold | Zendy; M. V. Penston | Zendy; E. Pérez | Zendy; Richard W. Pogge | Zendy; M. Richmond | Zendy; W. Romanishin | Zendy; E. I. Rosenblatt | Zendy; Les Saddlemyer | Zendy; A. C. Sadun | Zendy; S. R. Sawyer | Zendy; Joseph C. Shields | Zendy; A. I. Shapovalova | Zendy; A. G. Smith | Zendy; H. A. Smith | Zendy; Paul S. Smith | Zendy; WeiHsin Sun | Zendy; U. Thiele | Zendy; T. J. Turner | Zendy; Sylvain Veilleux | Zendy; R. M. Wagner | Zendy; R. J. Weymann | Zendy; B. J. Wilkes | Zendy; Beverley J. Wills | Zendy; D. Wills | Zendy; P. F. Younger | Zendy

Open Access

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

Author(s) -

B. M. Peterson,

T. J. Balonek,

E. S. Barker,

Jill Bechtold,

R. Bertram,

N. G. Bochkarev,

M. Bolte,

D. Bond,

Todd A. Boroson,

M. T. Carini,

T. E. Carone,

J. A. Christensen,

S. D. Clements,

A. L. Cochran,

R. D. Cohen,

D. Crampton,

M. Dietrich,

M. Elvis,

A. M. N. Ferguson,

A. V. Filippenko,

K. J. Fricke,

C. M. Gaskell,

J. P. Halpern,

J. P. Huchra,

J. B. Hutchings,

W. Kollatschny,

Anuradha Koratkar,

K. T. Korista,

Julian H. Krolik,

N. J. Lame,

Ari Laor,

R. J. Leacock,

G. M. MacAlpine,

M. A. Malkan,

Dan Maoz,

H. R. Miller,

S. L. Morris,

H. Netzer,

Claudia L. Mendes de Oliveira,

J. E. Penfold,

M. V. Penston,

E. Pérez,

Richard W. Pogge,

M. Richmond,

W. Romanishin,

E. I. Rosenblatt,

Les Saddlemyer,

A. C. Sadun,

S. R. Sawyer,

Joseph C. Shields,

A. I. Shapovalova,

A. G. Smith,

H. A. Smith,

Paul S. Smith,

WeiHsin Sun,

U. Thiele,

T. J. Turner,

Sylvain Veilleux,

R. M. Wagner,

R. J. Weymann,

B. J. Wilkes,

Beverley J. Wills,

D. Wills,

P. F. Younger

Publication year - 1991

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/169675

Subject(s) - physics , astrophysics , galaxy , photometry (optics) , active galactic nucleus , spectroscopy , spectral line , wavelength , optical spectra , astronomy , stars , optics

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. 15 refs.

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