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Results from Five Years of Spectrophotometric Monitoring of 28 Palomar-Green Quasars

Published online by Cambridge University Press:  12 April 2016

Shai Kaspi
Shai Kaspi*
Affiliation:
School of Physics and Astronomyand the Wise Observatory, Tel-Aviv University, Tel-Aviv 69918, Israel

Abstract

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We present 5 years of results from a spectrophotometric monitoring program of 28 quasars. The typical sampling intervals are several months. We show the light curves obtained for two quasars, PG 0804+762 and PG 0953+414. Both sources show Balmer emissionline variations which follow those of the continuum with a time lag of order 100 days. This is the first reliable measurement of such a lag in active galactic nuclei with luminosity L > 1045 erg s−1. The broad-line region (BLR) size that is implied is almost an order of magnitude larger than that measured in several Seyfert 1 galaxies and is consistent with the hypothesis that the BLR size grows as L0.5.

Type
III. Broad-Line Profiles and Variability
Information
International Astronomical Union Colloquium , Volume 159: Emission Lines in Active Galaxies: New Methods and Techniques , 1997 , pp. 159 - 162
Copyright
Copyright © Astronomical Society of the Pacific 1997

References

Alexander, T. 1996, MNRAS, submitted.Google Scholar
Gaskell, C.M. 1994, in Reverberation Mapping of the Broad-Line Region in AGN, ed. Gondhalakar, P.M., Horne, K., & Peterson, B.M. (San Francisco: ASP), 111.Google Scholar
Jackson, N., et al. 1992, A&A, 262, 17.Google Scholar
Kaspi, S., Smith, P.S., Maoz, D., Netzer, H., & Jannuzi, B.T. 1996 ApJL, in press.Google Scholar
Maoz, D., & Netzer, H. 1989, MNRAS, 236, 21.CrossRefGoogle Scholar
Maoz, D., Smith, P.S., Jannuzi, B.T., Kaspi, S., & Netzer, H. 1994, ApJ, 421, 34.CrossRefGoogle Scholar
Schmidt, M., & Green, R.F. 1983, ApJ, 269, 352.CrossRefGoogle Scholar
Zheng, W., Burbidge, E.M., Smith, H.E., Cohen, R.D., & Bradley, S.E. 1987, ApJ, 322, 164.CrossRefGoogle Scholar