AAS 203rd Meeting, January 2004
Session 23 Quasars, Blazars and Jets
Oral, Monday, January 5, 2004, 10:00-11:30am, Centennial I/II

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[23.03] Optical Variability of Two High-Luminosity Radio-Quiet Quasars, PDS 456 and PHL 1811

C. M. Gaskell, A. J. Benker, J. S. Campbell, K. A. Crowley, T. A. George, C. H. Hedrick, M. E. Hiller, E. S. Klimek, J. P. Leonard, B. W. Peterson, K. M. Sanders (U. Nebraska)

PDS 456 and PHL 1811 are two of the highest luminosity low-redshift quasars. Both have optical luminosities comparable to 3C 273, but they have low radio luminosities. PDS 456 is a broad line object but PHL 1811 could be classified as a high-luminosity Narrow-Line Seyfert 1 (NLS1) object. We present the results of optical (V-band) continuum monitoring of PDS 456 and PHL 1811. We compare the variability properties of these two very different AGNs compared with the radio-loud AGN 3C 273, and we discuss the implications for the origin of the optical continuum variability in AGNs.

This research has been supported in part by the Howard Hughes Foundation, Nebraska EPSCoR, the University of Nebraska Layman Fund, the University of Nebraska Undergraduate Creative Activities and Research Experiences, Pepsi-Cola, and the National Science Foundation through grant AST 03-07912.

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The author(s) of this abstract have provided an email address for comments about the abstract: mgaskell1@unl.edu

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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.