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    Tracking the variable jets of V404 Cygni during its 2015 outburst

    80259.pdf (7.393Mb)
    Access Status
    Open access
    Authors
    Tetarenko, A.J.
    Sivakoff, G.R.
    Miller-Jones, James
    Bremer, M.
    Mooley, K.P.
    Fender, R.P.
    Rumsey, C.
    Bahramian, Arash
    Altamirano, D.
    Heinz, S.
    Maitra, D.
    Markoff, S.B.
    Migliari, S.
    Rupen, M.P.
    Russell, D.M.
    Russell, T.D.
    Sarazin, C.L.
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Tetarenko, A.J. and Sivakoff, G.R. and Miller-Jones, J.C.A. and Bremer, M. and Mooley, K.P. and Fender, R.P. and Rumsey, C. et al. 2019. Tracking the variable jets of V404 Cygni during its 2015 outburst. Monthly Notices of the Royal Astronomical Society. 482 (3): pp. 2950-2972.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/sty2853
    ISSN
    0035-8711
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT140101082
    Remarks

    Copyright © 2019 The American Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/80177
    Collection
    • Curtin Research Publications
    Abstract

    © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. We present multifrequency monitoring observations of the black hole X-ray binary V404 Cygni throughout its 2015 June outburst. Our data set includes radio and mm/sub-mm photometry, taken with the Karl G. Jansky Very Large Array, Arc-Minute MicroKelvin Imager Large Array, Sub-millimeter Array, James Clerk Maxwell Telescope, and the Northern Extended Millimetre Array, combined with publicly available infrared, optical, UV, and X-ray measurements. With these data, we report detailed diagnostics of the spectral and variability properties of the jet emission observed during different stages of this outburst. These diagnostics show that emission from discrete jet ejecta dominated the jet emission during the brightest stages of the outburst. We find that the ejecta became fainter, slower, less frequent, and less energetic, before the emission transitioned (over 1-2 d) to being dominated by a compact jet, as the outburst decayed towards quiescence. While the broad-band spectrum of this compact jet showed very little evolution throughout the outburst decay (with the optically thick to thin synchrotron jet spectral break residing in the near-infrared/optical bands; ∼2-5 × 1014 Hz), the emission still remained intermittently variable at mm/sub-mm frequencies. Additionally, we present a comparison between the radio jet emission throughout the 2015 and previous 1989 outbursts, confirming that the radio emission in the 2015 outburst decayed significantly faster than in 1989. Lastly, we detail our sub-mm observations taken during the 2015 December mini-outburst of V404 Cygni, which demonstrate that, similar to the main outburst, the source was likely launching jet ejecta during this short period of renewed activity.

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