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    ALMA observations of A0620–00: Fresh clues on the nature of quiescent black hole X-ray binary jets

    80252.pdf (2.649Mb)
    Access Status
    Open access
    Authors
    Gallo, E.
    Teague, R.
    Plotkin, Richard
    Miller-Jones, James
    Russell, D.M.
    Dinçer, T.
    Bailyn, C.
    Maccarone, T.J.
    Markoff, S.
    Fender, R.P.
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Gallo, E. and Teague, R. and Plotkin, R.M. and Miller-Jones, J.C.A. and Russell, D.M. and Dinçer, T. and Bailyn, C. et al. 2019. ALMA observations of A0620–00: Fresh clues on the nature of quiescent black hole X-ray binary jets. Monthly Notices of the Royal Astronomical Society. 488 (1): pp. 191-197.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stz1634
    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 © 2019 The American Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/80170
    Collection
    • Curtin Research Publications
    Abstract

    © 2019 The Author(s). We report on Atacama Large Millimeter Array (ALMA) continuum observations of the black hole X-ray binary A0620–00 at an X-ray luminosity nine orders of magnitude sub-Eddington. The system was significantly detected at 98 GHz (at 44 ± 7 μJy) and only marginally at 233 GHz (20 ± 8 μJy), about 40 d later. These results suggest either an optically thin sub-mm synchrotron spectrum, or highly variable sub-mm jet emission on month time-scales. Although the latter appears more likely, we note that, at the time of the ALMA observations, A0620–00 was in a somewhat less active optical-IR state than during all published multiwavelength campaigns when a flat-spectrum, partially self-absorbed jet has been suggested to extend from the radio to the mid-IR regime. Either interpretation is viable in the context of an internal shock model, where the jet’s spectral shape and variability are set by the power density spectrum of the shells’ Lorentz factor fluctuations. While strictly simultaneous radio–mm-IR observations are necessary to draw definitive conclusions for A0620–00, the data presented here, in combination with recent radio and sub-mm results from higher luminosity systems, demonstrate that jets from black hole X-ray binaries exhibit a high level of variability – either in flux density or intrinsic spectral shape, or both – across a wide spectrum of Eddington ratios. This is not in contrast with expectations from an internal shock model, where lower jet power systems can be expected to exhibit larger fractional variability owing to an overall decrease in synchrotron absorption.

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