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    Linking Jet Emission, X-Ray States, and Hard X-Ray Tails in the Neutron Star X-Ray Binary GX 17+2

    Access Status
    Fulltext not available
    Authors
    Migliari, S.
    Miller-Jones, James
    Fender, R.
    Homan, J.
    Di Salvo, T.
    Rothschild, R.
    Rupen, M.
    Tomsick, J.
    Wijnands, R.
    van der Klis, M.
    Date
    2007
    Type
    Journal Article
    
    Metadata
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    Citation
    Migliari, S. and Miller-Jones, J. and Fender, R. and Homan, J. and Di Salvo, T. and Rothschild, R. and Rupen, M. et al. 2007. Linking Jet Emission, X-Ray States, and Hard X-Ray Tails in the Neutron Star X-Ray Binary GX 17+2. The Astrophysical Journal. 671 (1): pp. 706-712.
    Source Title
    The Astrophysical Journal
    Additional URLs
    http://iopscience.iop.org/0004-637X/671/1/706/
    ISSN
    0004637X
    URI
    http://hdl.handle.net/20.500.11937/13010
    Collection
    • Curtin Research Publications
    Abstract

    We present the results of simultaneous radio (VLA) and X-ray (RXTE) observations of the Z-type neutron star X-ray binary GX 17+2. The aim is to assess the coupling between X-ray and radio properties throughout its three rapidly variable X-ray states and during the time-resolved transitions. These observations allow us, for the first time, to investigate quantitatively the possible relations between the radio emission and the presence of hard X-ray tails and the X-ray state of the source. The observations reveal (1) a coupling between the radio jet emission and the X-ray state of the source, that is, the position in the X-ray hardness-intensity diagram (HID); (2) a coupling between the presence of a hard X-ray tail and the position in the HID, qualitatively similar to that found for the radio emission; (3) an indication of a quantitative positive correlation between the radio flux density and the X-ray flux in the hard tail power-law component; (4) evidence for the formation of a radio jet associated with the flaring branch-to-normal branch X-ray state transition; and (5) that the radio flux density of the newly formed jet stabilizes when the normal-branch oscillation (NBO) in the X-ray power spectrum stabilizes its characteristic frequency, suggesting a possible relation between X-ray variability associated with the NBO and jet formation. We discuss our results in the context of jet models.

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