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Quasi-periodic oscillations in bright galactic-bulge X-ray sources

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Abstract

Quasi-periodic oscillations with frequencies in the range 5–50 Hz have recently been discovered in X-rays from two bright galactic-bulge sources and ScoX-1. We propose that these sources are weakly magnetic neutron stars accreting from disks in which the plasma is clumped. The interaction of the magnetosphere with clumps in the inner disk modulates the accretion rate, causing oscillations in the X-ray flux with many of the observed properties.

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Author notes

  1. M. A. Alpar

    Present address: Research Institute for Basic Sciences, PO Box 74, Gebze, Kocaeli, Turkey

Authors and Affiliations

  1. Department of Physics, University of Illinois at Urbana-Champaign, 1110 W Green Street, Urbana, Illinois, 61801, USA

    F. K. Lamb, N. Shibazaki & M. A. Alpar

  2. Department of Astronomy, University of Illinois at Urbana-Champaign, 1110 W Green Street, Urbana, Illinois, 61801, USA

    F. K. Lamb

  3. Department of Physics and Columbia Astrophysics Laboratory, Columbia University, 538 W 120th Street, New York, New York, 10027, USA

    J. Shaham

Authors
  1. F. K. Lamb
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  2. N. Shibazaki
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  3. M. A. Alpar
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  4. J. Shaham
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Lamb, F., Shibazaki, N., Alpar, M. et al. Quasi-periodic oscillations in bright galactic-bulge X-ray sources. Nature 317, 681–687 (1985). https://doi.org/10.1038/317681a0

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