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Broad Line Variations in NGC 5548

Published online by Cambridge University Press:  07 August 2017

Edward I. Rosenblatt  and
Matthew A. Malkan
Edward I. Rosenblatt
Affiliation:
Department of Astronomy and Astrophysics, University of California, Los Angeles, Los Angeles, California 90024-1562
Matthew A. Malkan
Affiliation:
Department of Astronomy and Astrophysics, University of California, Los Angeles, Los Angeles, California 90024-1562

Extract

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Since broad line variations can, in principle, constrain the structure and kinematics of the broad line region in active galaxies we have conducted a monitoring program of 20 Seyfert galaxies over a 5 year period in order to study broad line flux and profile changes. Included in our sample is the Seyfert 1.5 galaxy NGC 5548. Fifteen observations were taken from 1979 to 1984 mainly with the 60″ Palomar telescope and a SIT vidicon spectrograph. Measurements show (Fig. 1) that both the Hβ and Hγ line flux varied by 200% and the continuum varied by 300%. Furthermore, these changes were positively correlated as one would expect from photoionization by a central continuum source.

Type
Part 2: BLR and Variability
Information
Symposium - International Astronomical Union , Volume 134: Active Galactic Nuclei , 1989 , pp. 114 - 115
Copyright
Copyright © Kluwer 1989 

References

Anderson, K. S. 1971, Ap. J., 169:449 Google Scholar
Peterson, B. M. 1987, Ap. J., 312:79 Google Scholar