ASCA observations of Seyfert 1 galaxies: I. Data Analysis, Imaging and Timing

Details ASCA observations of Seyfert 1 galaxies: I. Data Analysis, Imaging and Timing ASCA observations of Seyfert 1 galaxies: I. Data Analysis, Imaging and Timing

1996-08-26

arxiv.org/abs/astro-ph/9608170v1

Astrophys.J.Suppl.113:23,1997

Astronomy and Astrophysics

Astrophysics

30 pages, 5 figures. LaTeX with encapsulated postscript. To appear in the Astrophysical Journal. Also available via http://l

Scientific paper

10.1086/313053

We present the first in a series of papers describing the X-ray properties of a sample of 18 Seyfert 1 galaxies, using data obtained by \asca. The imaging data reveal a number of serendipitous hard X-ray sources in some source fields, but none contribute significantly to the hard X-ray flux of the AGN. All but one of the Seyferts show evidence for variability on timescales of minutes-hours, with the amplitude anti-correlated with the source luminosity, confirming previous results. In at least 8 sources, there is evidence that the variability amplitude below 2 keV is greater than that in the hard X-ray band, perhaps indicating variable components other than the power-law in the soft band. Ultra-rapid variability, implying significant power at frequencies $> 10^{-3}$~Hz is detected in at least 5 sources, but is difficult to detect in most cases, due to the sampling and signal-to-noise ratio. In Mrk 766 and MCG-6-30-15 there is also an indication that the high--frequency power--spectra are variable in shape and/or intensity. There is similar evidence in NGC 4151, but on longer time scales.

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