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Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VII. Variability of the optical spectrum of NGC 5548 over 4 years

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Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VII. Variability of the optical spectrum of NGC 5548 over 4 years

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Título Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VII. Variability of the optical spectrum of NGC 5548 over 4 years
Autor Peterson, Bradley M.
Berlind, P.
Bertram, R.
Bochkarev, N.G.
Bond, D.
Brotherton, Mike
Busler, J.R.
Chuvaev, K.K.
Cohen, R.D.
Dietrich, Matthias
Elvis, Martin
Filippenko, Alexei V.
Foltz, C.B.
Garnavich, P.M.
Ho, L.C.
Horine, E.
Horne, Keith
Huchra, John P.
Kollatschny, W.
Korista, Kirk T.
Malkan, M.A.
Matheson, T.
Mignoli, M.
Morris, S.L.
Nazarova, L.
Penfold, J.
Peters, J.
Pogge, Richard William
Pronik, V.I.
Rush, B.
Sergeev, S.G.
Shapovalova, A.I.
Shields, J.C.
Stirpe, Giovanna M.
Tokarz, S.
Wagner, R.M.
Weymann, R.J.
White, R.J.
Wilkes, B.J.
Wills, Derek
Wills, Beverley J.
Winge, Claudia
Younger, P.F.
Abstract We 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 Hβ 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 Hβ transfer functions for each of the 4 yr and for the entire 4 yr database are derived by using a maximum entropy method.
Contido em The astrophysical journal. Chicago. Vol. 425, no. 2, pt. 1 (Apr. 1994), p. 622-634
Assunto Espectros astronômicos
Galáxia NGC 5548
Galaxias seyfert
Nucleo galatico
Observações astronômicas no visível
[en] Galaxies: active-galaxies: individual (NGC 5548)-
[en] Galaxies: nuclei-galaxies: seyfert
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108829
Arquivos Descrição Formato
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