The X-ray variability of NGC 6814 - Power spectrum

Details The X-ray variability of NGC 6814 - Power spectrum The X-ray variability of NGC 6814 - Power spectrum

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...400..138d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 400, no. 1, p. 138-152.

Astronomy and Astrophysics

Astrophysics

76

Active Galactic Nuclei, Active Galaxies, Light Curve, Power Spectra, Seyfert Galaxies, X Ray Sources, Data Flow Analysis, Ginga Satellite, Periodic Variations

Scientific paper

The existence of the periodic component seen in NGC 6814 with Exosat at 12,000 +/- 100 s is confirmed by a power spectrum and folded light curve analysis of unevenly sampled Ginga data. A comparison of the power spectra produced from simulated light curves with that observed enables the intrinsic shape of the power spectrum of the source to be determined despite the distortions introduced by the window function. The best estimate for the period is 12,132 +/- 3 s, where the error is that derived from simulations. An upper limit to the rate of change of period of about 10 exp -9 is inferred if the light curves are truly phase-coherent, but as this is not required by the data, the conservative upper limit is not greater than 5 x 10 exp -7. The large amount of power in the periodic component and its stability both suggest occultation of the source as its origin.

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