Short-term X-ray variability of the BL Lacertae object PKS 2155 - 304 - Power spectrum and cross-correlation analysis

Details Short-term X-ray variability of the BL Lacertae object PKS 2155 - 304 - Power spectrum and cross-correlation analysis Short-term X-ray variability of the BL Lacertae object PKS 2155 - 304 - Power spectrum and cross-correlation analysis

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...380...78t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 380, Oct. 10, 1991, p. 78-83.

Astronomy and Astrophysics

Astrophysics

19

Bl Lacertae Objects, Light Curve, Power Spectra, X Ray Sources, Cross Correlation, Exosat Satellite, Variability

Scientific paper

A detailed power spectrum and cross-correlation analysis are presented of the X-ray light curves of PKS 2155 - 304. This BL Lac object was observed in the 0.1-10 keV band for a total of 80 hr at nine epochs between 1983 and 1986 with the Exosat Observatory. The power spectra exhibit 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. The 3-6 keV light curves are cross-correlated with the 0.1-2 keV and the 1-2 keV light curves separately. It is shown that spurious time lags can be introduced by systematic uncertainties related to the swapping of the Exosat medium-energy detectors and the switching on and off of the instruments. The short-term X-ray variability of PKS 2155 - 304 is compared with that of the Seyfert galaxies and is discussed within the framework of BL Lac emission models.

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