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    The 2015 decay of the black hole X-ray binary V404 Cygni: Robust disk-jet coupling and a sharp transition into quiescence

    248284.pdf (1.221Mb)
    Access Status
    Open access
    Authors
    Plotkin, Richard
    Miller-Jones, James
    Gallo, E.
    Jonker, P.
    Homan, J.
    Tomsick, J.
    Kaaret, P.
    Russell, D.
    Heinz, S.
    Hodges-Kluck, E.
    Markoff, S.
    Sivakoff, G.
    Altamirano, D.
    Neilsen, J.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Plotkin, R. and Miller-Jones, J. and Gallo, E. and Jonker, P. and Homan, J. and Tomsick, J. and Kaaret, P. et al. 2017. The 2015 decay of the black hole X-ray binary V404 Cygni: Robust disk-jet coupling and a sharp transition into quiescence. Astrophysical Journal. 834: 104.
    Source Title
    Astrophysical Journal
    DOI
    10.3847/1538-4357/834/2/104
    ISSN
    0004-637X
    School
    Department of Physics and Astronomy
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT140101082
    Remarks

    Copyright © 2017 The American Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/51213
    Collection
    • Curtin Research Publications
    Abstract

    We present simultaneous X-ray and radio observations of the black hole X-ray binary V404 Cygni at the end of its 2015 outburst. From 2015 July 11-August 5, we monitored V404 Cygni with Chandra, Swift, and NuSTAR in the X-ray, and with the Karl G. Jansky Very Large Array and the Very Long Baseline Array in the radio, spanning a range of luminosities that were poorly covered during its previous outburst in 1989 (our 2015 campaign covers ). During our 2015 campaign, the X-ray spectrum evolved rapidly from a hard photon index of G ˜ 1.6 (at LX ˜ 10 erg s-34 1) to a softer G ˜ 2 (at L ˜ 3 × 10 erg s- X 33 1). We argue that V404 Cygni reaching marks the beginning of the quiescent spectral state, which occurs at a factor of ˜3-4 higher X-ray luminosity than the average pre-outburst luminosity of . V404 Cygni falls along the same radio/X-ray luminosity correlation that it followed during its previous outburst in 1989, implying a robust disk-jet coupling. We exclude the possibility that a synchrotron-cooled jet dominates the X-ray emission in quiescence, leaving synchrotron self-Compton from either a hot accretion flow or from a radiatively cooled jet as the most likely sources of X-ray radiation, and/or particle acceleration along the jet becoming less efficient in quiescence. Finally, we present the first indications of correlated radio and X-ray variability on minute timescales in quiescence, tentatively measuring the radio emission to lag the X-ray by 15 ± 4minute, suggestive of X-ray variations propagating down a jet with a length of <3.0 au. Copyright © 2017 The American Astronomical Society. All rights reserved.

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