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    The long outburst of the black hole transient GRS 1716-249 observed in the X-ray and radio band

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    Access Status
    Open access
    Authors
    Bassi, T.
    Del Santo, M.
    D'Aì, A.
    Motta, S.
    Malzac, J.
    Segreto, A.
    Miller-Jones, James
    Atri, P.
    Plotkin, Richard
    Belloni, T.
    Mineo, T.
    Tzioumis, A.
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Bassi, T. and Del Santo, M. and D'Aì, A. and Motta, S. and Malzac, J. and Segreto, A. and Miller-Jones, J. et al. 2019. The long outburst of the black hole transient GRS 1716-249 observed in the X-ray and radio band. Monthly Notices of the Royal Astronomical Society. 482 (2): pp. 1587-1601.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/sty2739
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy (Physics)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT140101082
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/72338
    Collection
    • Curtin Research Publications
    Abstract

    We present the spectral and timing analysis of X-ray observations performed on the Galactic black hole transient GRS 1716-249 during the 2016-2017 outburst. The source was almost continuously observed with the Neil Gehrels Swift Observatory from 2016 December until 2017 October. The X-ray hardness ratio and timing evolution indicate that the source approached the soft state three times during the outburst, even though it never reached the canonical soft spectral state. Thus, GRS 1716-249 increases the number of black hole transients showing outbursts with 'failed' state transition. During the softening events, XRT and BAT broad-band spectral modelling, performed with thermal Comptonization plus a multicolour disc black-body, showed a photon index (G < 2) and an inner disc temperature (kTin = 0.2- 0.5 keV) characteristic of the hard intermediate state. This is in agreement with the root mean square amplitude of the flux variability (rms > 10 per cent). We find that, coherently with a scenario in which the disc moves closer to the compact object, the accretion disc inner radius decreases with the increase of the inner disc temperature, until a certain point when the temperature starts to increase at constant radius. This, in addition with the spectral analysis results, suggests that either the accretion disc reached the innermost stable circular orbit during the hard intermediate state or the hot accretion flow might recondensate in an inner mini-disc.We report on the radio observations performed during the outburst finding that GRS 1716-249 is located on the radio-quiet 'outlier' branch of the radio/X-ray luminosity plane.

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