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    GS 2000+25: The Least Luminous Black Hole X-Ray Binary

    80248.pdf (1.945Mb)
    Access Status
    Open access
    Authors
    Rodriguez, J.
    Urquhart, R.
    Plotkin, Richard
    Panurach, T.
    Chomiuk, L.
    Strader, J.
    Miller-Jones, James
    Gallo, E.
    Sivakoff, G.R.
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Rodriguez, J. and Urquhart, R. and Plotkin, R.M. and Panurach, T. and Chomiuk, L. and Strader, J. and Miller-Jones, J.C.A. et al. 2020. GS 2000+25: The Least Luminous Black Hole X-Ray Binary. Astrophysical Journal. 889 (1): Article No. 58.
    Source Title
    Astrophysical Journal
    DOI
    10.3847/1538-4357/ab5db5
    ISSN
    0004-637X
    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/20.500.11937/80166
    Collection
    • Curtin Research Publications
    Abstract

    © 2020. The American Astronomical Society. All rights reserved.. Little is known about the properties of the accretion flows and jets of the lowest-luminosity quiescent black holes. We report new, strictly simultaneous radio and X-ray observations of the nearby stellar-mass black hole X-ray binary GS 2000+25 in its quiescent state. In deep Chandra observations we detect the system at a faint X-ray luminosity of erg s-1 (1-10 keV). This is the lowest X-ray luminosity yet observed for a quiescent black hole X-ray binary, corresponding to an Eddington ratio L X/L Edd ∼ 10-9. In 15 hours of observations with the Karl G. Jansky Very Large Array, no radio continuum emission is detected to a 3σ limit of <2.8 μJy at 6 GHz. Including GS 2000+25, four quiescent stellar-mass black holes with L X < 1032 erg s-1 have deep simultaneous radio and X-ray observations and known distances. These sources all have radio to X-ray luminosity ratios generally consistent with, but slightly lower than, the low-state radio/X-ray correlation for stellar-mass black holes with L X > 1032 erg s-1. Observations of these sources tax the limits of our current X-ray and radio facilities, and new routes to black hole discovery are needed to study the lowest-luminosity black holes.

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