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    Observations of the disk/jet coupling of MAXI J1820+070 during its descent to quiescence

    91351.pdf (923.5Kb)
    Access Status
    Open access
    Authors
    Shaw, A.W.
    Plotkin, Richard
    Miller-Jones, James
    Homan, J.
    Gallo, E.
    Russell, D.M.
    Tomsick, J.A.
    Kaaret, P.
    Corbel, S.
    Espinasse, M.
    Bright, J.
    Date
    2021
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Shaw, A.W. and Plotkin, R.M. and Miller-Jones, J.C.A. and Homan, J. and Gallo, E. and Russell, D.M. and Tomsick, J.A. et al. 2021. Observations of the disk/jet coupling of MAXI J1820+070 during its descent to quiescence. Astrophysical Journal. 907 (1): ARTN 34.
    Source Title
    Astrophysical Journal
    DOI
    10.3847/1538-4357/abd1de
    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
    URI
    http://hdl.handle.net/20.500.11937/91527
    Collection
    • Curtin Research Publications
    Abstract

    Black hole X-ray binaries in the quiescent state (Eddington ratios typically ≲10−5) display softer X-ray spectra (photon indices Γ ∼ 2) compared to higher-luminosity black hole X-ray binaries in the hard state (Γ ∼ 1.7). However, the cause of this softening and its implications for the underlying accretion flow are still uncertain. Here, we present quasi-simultaneous X-ray and radio spectral monitoring of the black hole X-ray binary MAXI J1820 +070 during the decay of its 2018 outburst and of a subsequent reflare in 2019, providing an opportunity to monitor a black hole X-ray binary as it actively transitions into quiescence. We probe 1-10 keV X-ray luminosities as low as LX ∼ 4 × 1032 erg s−1, equivalent to Eddington fractions of ∼4 × 10−7. During its decay toward quiescence, the X-ray spectrum of MAXI J1820+070 softens from Γ ∼ 1.7 to Γ ∼ 2, with the softening taking ∼30 days and completing at LX ≈ 1034 erg s−1 (≈10−5 LEdd). While the X-ray spectrum softens, the radio spectrum generally remains flat or inverted throughout the decay. We also find that MAXI J1820+070 follows a radio (LR)-X-ray luminosity correlation of the form LR ∝ LX0.52±0.07, making it the fourth black hole system to follow the so-called “standard track” unbroken over several (in this case, four) decades in LX. Comparing the radio/X-ray spectral evolution(s) with the LR-LX plane, we find that the X-ray softening is consistent with X-rays produced by Comptonization processes in a radiatively inefficient accretion flow. We generally disfavor X-ray emission originating solely from within the jet, with the possible exception of X-rays produced via synchrotron self-Compton processes.

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