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Abstract
A detailed power spectrum and cross-correlation analysis of the X-ray light curves of the BL Lac object PKS 2155-304, obtained with EXOSAT, is presented. The power spectra show a marked red noise-type variability, with the power increasing steeply toward low frequency. The variability is more pronounced in the 1-6 keV band than in the 0.1-2 keV band. It is shown that the presence of data gaps can flatten significantly the logarithmic slope of the power spectrum. A technique for bridging data gaps which reduces the power spectrum distortions is introduced. In this way an average power law slope of about -2.5 is obtained for the power spectrum from the 1-6 keV data.
Published Version
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