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

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 Decem...

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Detalhes bibliográficos
Autores: 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, Luis 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.
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:1994
País:Brasil
Recursos:Universidade Federal do Rio Grande do Sul (UFRGS)
Repositório:Repositório Institucional da UFRGS
Idioma:inglês
OAI Identifier:oai:www.lume.ufrgs.br:10183/108829
Acesso em linha:http://hdl.handle.net/10183/108829
Access Level:Acceso aberto
Palavra-chave:Espectros astronômicos
Nucleo galatico
Galaxias seyfert
Galáxia NGC 5548
Observações astronômicas no visível
Galaxies: active-galaxies: individual (NGC 5548)-
Galaxies: nuclei-galaxies: seyfert
Descrição
Resumo: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.

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