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Discovery of 800 Hz Quasi-Periodic Oscillations in 4U 1608-52

Berger, M. and van der Klis, M. and van Paradijs, J. and Lewin, W. H. G. and Lamb, F. and Vaughan, B. A. and Kuulkers, E. and Augustejin, T. and Zhang, W. and Marshall, F. E. and Swank, J. H. and Lapidus, I. R. and Lochner, J. C. and Strohmayer, T. E. (1996) Discovery of 800 Hz Quasi-Periodic Oscillations in 4U 1608-52. Astrophysical Journal Letters, 469 (1). L141-L145. ISSN 2041-8205.

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We present results of Rossi X-Ray Timing Explorer observations of the low-mass X-ray binary and atoll source 4U 1608-52 made over 9 days during the decline of an X-ray intensity outburst in 1996 March. A fast-timing analysis shows a strong and narrow quasi-periodic oscillation (QPO) peak at frequencies between 850 and 890 Hz on March 3 and 6, as well as a broad peak around 690 Hz on March 9. Observations on March 12 show no significant signal. On March 3, the X-ray spectrum of the QPO is quite hard; its strength increases steadily from 5% at ~2 keV to ~20% at ~12 keV. The QPO frequency varies between 850 and 890 Hz on that day, and the peak widens and its rms decreases with centroid frequency in a way very similar to the well-known horizontal branch oscillations (HBO) in Z sources. We apply the HBO beat frequency model to atoll sources and suggest that, whereas the model could produce QPOs at the observed frequencies, the lack of correlation we observe between QPO properties and X-ray count rate is hard to reconcile with this model.

Item Type:Article
Related URLs:
URLURL TypeDescription
van der Klis, M.0000-0003-0070-9872
Lamb, F.0000-0002-3862-7402
Zhang, W.0000-0002-1426-9698
Swank, J. H.0000-0001-7079-9338
Strohmayer, T. E.0000-0001-7681-5845
Additional Information:© 1996. American Astronomical Society. Received 1966 May 20, accepted for publication 1996 July 8. This work was supported in part by the Netherlands Organization for Scientific Research (NWO) under grant PGS 78-277 and by the Netherlands Foundation for Research in Astronomy (ASTRON) under grant 781-76-017. W. H. G. L. and J. V. P. acknowledge support from the National Aeronautics and Space Administration.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)PGS 78-277
Non-Subject Keywords:accretion, accretion disks; stars: individual (4U 1608–52); stars: neutron
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1997-47
Issue or Number:1
Record Number:CaltechAUTHORS:20141203-094732385
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52314
Deposited By: Deborah Miles
Deposited On:03 Dec 2014 20:46
Last Modified:09 Mar 2020 13:19

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