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    The face-on disc of MAXI J1836-194

    198277_198277.pdf (1.132Mb)
    Access Status
    Open access
    Authors
    Russell, Thomas
    Soria, Roberto
    Motch, C.
    Pakull, M.
    Torres, M.
    Curran, Peter
    Jonker, P.
    Miller-Jones, James
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Russell, T.D. and Soria, R. and Motch, C. and Pakull, M.W. and Torres, M.A.P. and Curran, P.A. and Jonker, P.G. and Miller-Jones, J.C.A. 2014. The face-on disc of MAXI J1836-194. Monthly Notices of the Royal Astronomical Society. 439 (2): pp. 1381-1389.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stt2480
    ISSN
    0035-8711
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2014 The Authors. Published by Oxford University Press, on behalf of Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/36703
    Collection
    • Curtin Research Publications
    Abstract

    We present Very Large Telescope optical spectra of the black hole candidate X-ray binary MAXI J1836−194 at the onset of its 2011 outburst. Although the spectrum was taken at the beginning of the outburst and contains a significant contribution from the optically thin synchrotron emission that originates in the radio jet, we find that the accretion disc was already large and bright. Single-peaked, narrow Hα and He II λ4686 lines imply the most face-on accretion disc observed in a black hole low-mass X-ray binary to date, with an inclination angle between 4° and 15°, assuming a black hole mass of between 5 and 12 M, for distances of between 4 and 10 kpc. We use New Technology Telescope observations of the system in quiescence to place strong upper limits on the mass and radius of the donor star and the orbital period. The donor is a main-sequence star with a mass <0.65 M and a radius <0.59 R with an orbital period of <4.9 h. From those values and Roche lobe geometry constraints we find that the compact object must be >1.9 M if the system is located 4 kpc away and >7.0 M at 10 kpc.

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