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    VLT spectroscopy of the black hole candidate Swift J1357.2-0933 in quiescence

    231978_231978.pdf (321.8Kb)
    Access Status
    Open access
    Authors
    Torres, M.
    Jonker, P.
    Miller-Jones, James
    Steeghs, D.
    Repetto, S.
    Wu, J.
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Torres, M. and Jonker, P. and Miller-Jones, J. and Steeghs, D. and Repetto, S. and Wu, J. 2015. VLT spectroscopy of the black hole candidate Swift J1357.2-0933 in quiescence. Monthly Notices of the Royal Astronomical Society. 450 (4): pp. 4292-4300.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stv720
    ISSN
    0035-8711
    School
    Department of Physics and Astronomy
    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 © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/4860
    Collection
    • Curtin Research Publications
    Abstract

    We present time-resolved optical spectroscopy of the counterpart to the high-inclination black hole low-mass X-ray binary Swift J1357.2−0933 in quiescence. Absorption features from the mass donor star were not detected. Instead the spectra display prominent broad double-peaked H α emission and weaker He i emission lines. From the H α peak-to-peak separation, we constrain the radial velocity semi-amplitude of the donor star to K2 > 789 km s−1. Further analysis through radial velocity and equivalent width measurements indicates that the H α line is free of variability due to S-wave components or disc eclipses. From our data and previous observations during outburst, we conclude that long-term radial velocity changes ascribed to a precessing disc were of low amplitude or not present. This implies that the centroid position of the line should closely represent the systemic radial velocity, γ. Using the derived γ = −150 km s−1 and the best available limits on the source distance, we infer that the black hole is moving towards the plane in its current Galactic orbit unless the proper motion is substantial. Finally, the depth of the central absorption in the double-peaked profiles adds support for Swift J1357.2−0933 as a high-inclination system. On the other hand, we argue that the low hydrogen column density inferred from X-ray fitting suggests that the system is not seen edge-on.

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