A Search for Rapid Optical Variability in Selected Narrow-Line Seyfert 1 Galaxies

Details A Search for Rapid Optical Variability in Selected Narrow-Line Seyfert 1 Galaxies A Search for Rapid Optical Variability in Selected Narrow-Line Seyfert 1 Galaxies

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19511506w&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #115.06; Bulletin of the American Astronomical Society, Vol. 31, p.1543

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Scientific paper

Narrow-Line Seyfert 1 galaxies are a peculiar but important group of Seyfert 1 galaxies that are characterized by strong soft X-ray excess emission, extremely rapid and large-amplitude X-ray variability, steep 2-10 keV power-law continua, and unusual discrete spectral features. The origin of the distinctive X-ray/optical properties is yet unknown, but is plausibly linked to an extreme value of a primary physical parameter: the accretion rate, nuclear orientation and black hole spin have been suggested. Because of their extreme properties, the study of Narrow-Line Seyfert 1s should allow us to progress in solving the diverse problems more generally posed by the Seyfert phenomenon. The giant amplitude X-ray variability is an especially interesting characteristic. It would be of great interest to determine if a similar phenomenon is present at optical wavelengths, and if so, what if any relationship exists between these different regimes. During the past two years, we have embarked upon a program of investigation which has as its primary goal the detection of rapid optical variations, if they exist, for a sample of five NLS1 galaxies. The results are clearly positive for IRAS 13224-3809. However, the results are less conclusive for the other four galaxies in our sample (AKN 564, MRK 766, PG 1404+226 and PG 1244+026). A summary of the results of our program will be presented. The authors gratefully acknowledge support from the RPE fund at Georgia State University and support from NASA.

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