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• W3100650343 endingPage "67" @default.
• W3100650343 startingPage "23" @default.
• W3100650343 abstract "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." @default.
• W3100650343 created "2020-11-23" @default.
• W3100650343 creator A5066501440 @default.
• W3100650343 creator A5067527869 @default.
• W3100650343 creator A5087772300 @default.
• W3100650343 creator A5091213507 @default.
• W3100650343 date "1997-11-01" @default.
• W3100650343 modified "2023-10-18" @default.
• W3100650343 title "<i>ASCA</i> Observations of Type 2 Seyfert Galaxies. I. Data Analysis Results" @default.
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