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The Quasi-Periodic Oscillations and Low-Frequency Noise of Scorpius X-1 as Transient Chaos: A Dripping Handrail?

Author

Listed:
  • Jeffrey D. Scargle
  • David L. Donoho
  • James P. Crutchfield
  • Thomas Steiman-Cameron
  • James Imamura
  • Karl Young

Abstract

We present evidence that the quasi-periodic oscillations (QPO) and low frequency noise (LFN) characteristic of many accretion sources are different aspects of the same physical process. We analyzed a long, high time resolution EXOSAT observation of Sco X-1. The x-ray luminosity varies stochastically on time scales from milliseconds to hours. The nature of this variability -- as quantified with both power spectrum analysis and new wavelet technique, the {\it scalegram} - agrees well with the {\it dripping handrail} accretion model, a simple dynamical system which exhibits {\it transient chaos}. In this model both the QPO and LFN are produced by radiation from blobs with a wide size distribution, resulting from accretion and subsequent diffusion of hot gas, the density of which is limited by an unspecified instability to lie below a threshold.

Suggested Citation

  • Jeffrey D. Scargle & David L. Donoho & James P. Crutchfield & Thomas Steiman-Cameron & James Imamura & Karl Young, 1993. "The Quasi-Periodic Oscillations and Low-Frequency Noise of Scorpius X-1 as Transient Chaos: A Dripping Handrail?," Working Papers 93-02-005, Santa Fe Institute.
    • Handle: RePEc:wop:safiwp:93-02-005
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