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    The Flare-dominated Accretion Mode of a Radio-bright Candidate Transitional Millisecond Pulsar

    80185.pdf (2.242Mb)
    Access Status
    Open access
    Authors
    Li, K.L.
    Strader, J.
    Miller-Jones, James
    Heinke, C.O.
    Chomiuk, L.
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Li, K.L. and Strader, J. and Miller-Jones, J.C.A. and Heinke, C.O. and Chomiuk, L. 2020. The Flare-dominated Accretion Mode of a Radio-bright Candidate Transitional Millisecond Pulsar. Astrophysical Journal. 895 (2): ARTN 89.
    Source Title
    Astrophysical Journal
    DOI
    10.3847/1538-4357/ab8f28
    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/20.500.11937/80103
    Collection
    • Curtin Research Publications
    Abstract

    © 2020. The American Astronomical Society. All rights reserved.. We report new simultaneous X-ray and radio continuum observations of 3FGL J0427.9-6704, a candidate member of the enigmatic class of transitional millisecond pulsars. These XMM-Newton and Australia Telescope Compact Array observations of this nearly edge-on, eclipsing low-mass X-ray binary were taken in the sub-luminous disk state at an X-ray luminosity of erg s-1. Unlike the few well-studied transitional millisecond pulsars, which spend most of their disk state in a characteristic high or low accretion mode with occasional flares, 3FGL J0427.9-6704 stayed in the flare mode for the entire X-ray observation of ∼20 hr, with the brightest flares reaching ∼2 × 1034 erg s-1. The source continuously exhibited flaring activity on timescales of ∼10-100 s in both the X-ray and optical/ultraviolet (UV). No measurable time delay between the X-ray and optical/UV flares is observed, but the optical/UV flares last longer, and the relative amplitudes of the X-ray and optical/UV flares show a large scatter. The X-ray spectrum can be well-fit with a partially absorbed power law (Γ ∼ 1.4-1.5), perhaps due to the edge-on viewing angle. Modestly variable radio continuum emission is present at all epochs, and is not eclipsed by the secondary, consistent with the presence of a steady radio outflow or jet. The simultaneous radio/X-ray luminosity ratio of 3FGL J0427.9-6704 is higher than any known transitional millisecond pulsars and comparable to that of stellar-mass black holes of the same X-ray luminosity, providing additional evidence that some neutron stars can be as radio-loud as black holes.

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