Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. 6: Variability of NGC 3783 from ground-based data
| Autor: | G. M. Stirpe, C. Winge, B. Altieri, D. Alloin, E. L. Aguero, G. C. Anupama, R. Ashley, R. Bertram, J. H. Calderon, R. M. Catchpole, R. L. M. Corradi, E. Covino, H. A. Dottori, M. W. Feast, K. K. Ghosh, R. Gil Hutton, I. S. Glass, E. K. Grebel, L. Jorda, C. Koen, C. D. Laney, M. Maia, F. Marang, Y. D. Mayya, N. Morrell, Y. Nakada, M. G. Pastoriza, A. K. Pati, D. Pelat, B. M. Peterson, T. P. Prabhu, G. Roberts, R. Sagar, I. Salamanca, K. Sekiguchi, T. Storchi-Bergmann, A. Subramaniam, H. Van Winckel, F. van Wyk, M. Villada, R. M. Wagner, P. A. Whitelock, H. Winkler, J. Clavel, M. Dietrich, W. Kollatschny, P. T. O'Brien, G. C. Perola, M. C. Recondo-Gonzalez, P. Rodriguez-Pascual, M. Santos-Lleo |
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| Rok vydání: | 1994 |
| Předmět: |
Physics
Active galactic nucleus 010504 meteorology & atmospheric sciences Continuum (measurement) Lag Astronomy and Astrophysics Astrophysics Light curve 01 natural sciences Galaxy Space and Planetary Science Ionization 0103 physical sciences 010303 astronomy & astrophysics 0105 earth and related environmental sciences |
| Zdroj: | The Astrophysical Journal. 425:609 |
| ISSN: | 1538-4357 0004-637X |
| Popis: | The Seyfert 1 galaxy NGC 3783 was intensely monitored between 1991 December and 1992 August. We present the results from the ground-based observations in the optical and near-IR, which complement the data-set from the IUE, discussed elsewhere. Spectroscopic and photometric data from many observatories were combined in order to obtain well sampled light curves of the continuum and of H-Beta. During the campaign the source varied significantly. The light curves of the optical continuum and of H-Beta are similar to those obtained with the IUE. The near-IR flux did not vary significantly except for an increase at the end of the campaign. The optical continuum and the flux of H-Beta lag the UV continuum by 1 day or less and by 8 days respectively. These results confirm that the continuum variations are simultaneous or have a very small lag across the entire UV-optical range, and that the lines of NGC 3783 respond to ionizing continuum variations with less delay than those of NGC 5548. As in NGC 5548, the lag of H-Beta is greater than those of the high ionization lines. |
| Databáze: | OpenAIRE |
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