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• W3100292706 abstract "We analyse observations of the Seyfert galaxy NGC 4151 covering 90 years in the optical band and 27 years in the 2–10 keV X-ray band. We compute the normalized power spectrum density, the structure function and the autocorrelation function for these data. The results show that the optical and X-ray variability properties are significantly different. X-ray variations are predominantly in the time-scale range of 5–1000 d. The optical variations also have a short time-scale component that may be related to X-ray variability, but the dominant effect is the long time-scale variability, with time-scales longer than ∼10 yr. We compare our results with observations of NGC 5548 and Cyg X-1. We conclude that the long time-scale variability may be caused by radiation pressure instability in the accretion disc, although the observed time-scale in NGC 4151 is by a factor of a few longer than expected. X-ray variability of this source is very similar to what is observed in Cyg X-1 but scaled with the mass of the black hole, which suggests that the radiation pressure instability does not affect the X-ray production considerably." @default.
• W3100292706 created "2020-11-23" @default.
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• W3100292706 date "2003-07-11" @default.
• W3100292706 modified "2023-10-17" @default.
• W3100292706 title "Variability of accretion flow in the core of the Seyfert galaxy NGC 4151" @default.
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• W3100292706 doi "https://doi.org/10.1046/j.1365-8711.2003.06623.x" @default.
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