Other
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.3405s&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #34.05; Bulletin of the American Astronomical Society, Vol. 26, p.1364
Other
Scientific paper
The observed strong UV/Optical excess in many Seyfert 1 active galactic nuclei (AGNs) and quasars (QSOs) is well described as thermal radiation from the surface of an optically thick accretion disk surrounding a supermassive black hole. This scenario naturally leads to a radially symmetric temperature gradient with the innermost regions the hottest. Thus for a perturbation generated in the inner regions propagating outward, sequential variations from higher to lower frequencies should be expected, aside from the bolometric increase of brightness. We have launched a one-year monitoring program, approximately once every month, starting June 1994, on a sample of 8 Seyfert 1 galaxies with CCD direct imaging and differential photometry on the 1.0m telescope at Lick Observory to search for more conclusive evidence on these sequential variabilities which may provide stringent constraint on accretion disk or other continuum models. We measured the variabilities of the target AGNs at 3890 Angstroms (U), 5750 Angstroms (V), 8020 Angstroms (I), and 9750 Angstroms (Z), with two-inch square intermediate band filters developed in the BATC project. Preliminary data analysis shows an observational accuracy of 1% or better for some AGNs with adequate comparison stars. Details of observing strategy and preliminary results will be discussed.
Chen Christine H.
Lin Tai-Chia
Malkan Matthew A.
Stone Remington P. S.
Sun Wei-Hua
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