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Power spectral density analysis of hard X-ray emission of Cyg X-1

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Abstract

We report on results of analysis sperformed on data of three balloon observations of Cyg X-l in the range 20-200 keV. Evidence of periodic, even if not stable, pulsations were previously obtained at about 0.058 Hz. The continuous power spectrum, still showing a broad peak around the above frequency, can be explained on the basis of a model, similar to the shot noise one, where the single shot is replaced by a short sequence of equispaced pulses with a decaying amplitude. Such a model could also explain the bursting activity observed at lower energies.

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Authors and Affiliations

  1. Istituto TESRE/CNR, Via De' Castagnoli 1, 40126, Bologna, Italy

    F. Frontera & F. Fuligni

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  1. F. Frontera
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  2. F. Fuligni
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Now at Istituto Plasma Spazio/CNR, Via G.Galilei, 00044 Frascati, ITALY.

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Frontera, F., Fuligni, F. Power spectral density analysis of hard X-ray emission of Cyg X-1. Space Sci Rev 30, 379–384 (1981). https://doi.org/10.1007/BF01246050

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