Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.3204n&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #32.04; Bulletin of the American Astronomical Society, Vol. 30, p.855
Astronomy and Astrophysics
Astronomy
Scientific paper
AGN show strong, persistent X-ray variability down to the shortest measurable time scales. EXOSAT observations showed that the power spectra were generally featureless, and had a ``red noise'' character in the 10(-3}-10({-5)) Hz range. Variations on longer time scales are known to exist, but have never been examined in great detail due to a lack of appropriate data. RXTE has ushered in a new era of X-ray variability studies, in part due to its very liberal viewing constraints. For the first time, well-sampled light curves are being assembled on weeks-years time scales, allowing a search for characteristic features in the power spectra. Sympathetic scheduling has also enabled a number of large, multi-waveband variability campaigns to be coordinated. The results and implications of these observations will be discussed.
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