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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

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