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- W3100753491 abstract "Long-term X-ray variability of the low-luminosity active galactic nucleus of M81 was studied, using 16 ASCA observations spanning 5.5 yr. The object exhibits a factor of 3 variation over the 5.5 yr. The source intensity was relatively constant within each observation which lasted typically for one day, but intra-day variability by 30 per cent was detected on the 15th observation. The power-spectral density (PSD) was estimated in a ‘forward’ manner, over a frequency range of 10−8.2–10−4.3 Hz (period range of 0.25 d-5.5 yr), by utilizing the structure function and extensive Monte Carlo simulations in order to overcome the very sparse and uneven data samplings. When the PSD is assumed to be white below a ‘break frequency’ƒb and falls off as ∝ f−α above ƒb, where ƒ is frequency and α is a positive parameter, the M81 light curve is well described with 1/fb≥800 d and α=1.4±0.2." @default.
- W3100753491 created "2020-11-23" @default.
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- W3100753491 date "2001-03-11" @default.
- W3100753491 modified "2023-10-16" @default.
- W3100753491 title "Long-term variability of the low-luminosity active galactic nucleus of M81" @default.
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- W3100753491 doi "https://doi.org/10.1046/j.1365-8711.2001.04086.x" @default.
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