The re-occurrence of mHz quasi-periodic oscillations in Cygnus X−3

Authors

  • K. I. I. Koljonen,

    Corresponding author
    1. Aalto University Metsähovi Radio Observatory, Metsähovintie 114, FI-02540 Kylmälä, Finland
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  • D. C. Hannikainen,

    Corresponding author
    1. Aalto University Metsähovi Radio Observatory, Metsähovintie 114, FI-02540 Kylmälä, Finland
    2. Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Väisäläntie 20, FI-21500 Piikkiö, Finland
    3. Department of Physics and Space Sciences, Florida Institute of Technology, 150 W. University Blvd., Melbourne, FL 32901, USA
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  • M. L. McCollough

    Corresponding author
    1. Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138-1516, USA
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E-mail: karri@kurp.hut.fi (KIIK); diana@kurp.hut.fi (DCH); mccolml@head.cfa.harvard.edu (MLM)

ABSTRACT

We have re-analysed archival RXTE data of the X-ray binary Cygnus X−3 with a view to investigate the timing properties of the source. As compared to previous studies, we use an extensive sample of observations that include all the radio/X-ray spectral states that have been categorized in the source recently. In this study we identify two additional instances of quasi-periodic oscillations that have centroid frequencies in the mHz regime. These events are all associated to a certain extent with major radio flaring, which in turn is associated with relativistic jet ejection events. We review briefly scenarios whereby the quasi-periodic oscillations may arise.

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