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    Quasi-simultaneous radio and X-ray observations of Aql X-1: Probing low luminosities

    80186.pdf (4.150Mb)
    Access Status
    Open access
    Authors
    Gusinskaia, N.V.
    Hessels, J.W.T.
    Degenaar, N.
    Deller, A.T.
    Miller-Jones, James
    Archibald, A.M.
    Heinke, C.O.
    Moldón, J.
    Patruno, A.
    Tomsick, J.A.
    Wijnands, R.
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Gusinskaia, N.V. and Hessels, J.W.T. and Degenaar, N. and Deller, A.T. and Miller-Jones, J.C.A. and Archibald, A.M. and Heinke, C.O. et al. 2020. Quasi-simultaneous radio and X-ray observations of Aql X-1: Probing low luminosities. Monthly Notices of the Royal Astronomical Society. 492 (2): pp. 2858-2871.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stz3420
    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 © 2020 The American Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/80104
    Collection
    • Curtin Research Publications
    Abstract

    © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society Aql X-1 is one of the best-studied neutron star low-mass X-ray binaries. It was previously targeted using quasi-simultaneous radio and X-ray observations during at least seven different accretion outbursts. Such observations allow us to probe the interplay between accretion inflow (X-ray) and jet outflow (radio). Thus far, these combined observations have only covered one order of magnitude in radio and X-ray luminosity range; this means that any potential radio-X-ray luminosity correlation, LR ∝ LXβ, is not well constrained (β ≈ 0.4-0.9, based on various studies) or understood. Here we present quasi-simultaneous Very Large Array and Swift-XRT observations of Aql X-1's 2016 outburst, with which we probe one order of magnitude fainter in radio and X-ray luminosity compared to previous studies (6 × 1034 erg s−1 < LX <3 × 1035 erg s−1, i.e. the intermediate to low-luminosity regime between outburst peak and quiescence). The resulting radio non-detections indicate that Aql X-1's radio emission decays more rapidly at low X-ray luminosities than previously assumed - at least during the 2016 outburst. Assuming similar behaviour between outbursts, and combining all available data in the hard X-ray state, this can be modelled as a steep β =1.17+−003021 power-law index or as a sharp radio cut-off at LX ≲ 5 × 1035 erg s−1 (given our deep radio upper limits at X-ray luminosities below this value). We discuss these results in the context of other similar studies.

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