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    The MAVERIC Survey: Simultaneous Chandra and VLA observations of the transitional millisecond pulsar candidate NGC 6652B

    91344.pdf (1.322Mb)
    Access Status
    Open access
    Authors
    Paduano, A.
    Bahramian, Arash
    Miller-Jones, James
    Kawka, Adela
    Strader, J.
    Chomiuk, L.
    Heinke, C.O.
    MacCarone, T.J.
    Britt, C.T.
    Plotkin, Richard
    Shaw, A.W.
    Shishkovsky, L.
    Tremou, E.
    Tudor, V.
    Sivakoff, G.R.
    Date
    2021
    Type
    Journal Article
    
    Metadata
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    Citation
    Paduano, A. and Bahramian, A. and Miller-Jones, J.C.A. and Kawka, A. and Strader, J. and Chomiuk, L. and Heinke, C.O. et al. 2021. The MAVERIC Survey: Simultaneous Chandra and VLA observations of the transitional millisecond pulsar candidate NGC 6652B. Monthly Notices of the Royal Astronomical Society. 506 (3): pp. 4107-4120.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stab1928
    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
    URI
    http://hdl.handle.net/20.500.11937/91520
    Collection
    • Curtin Research Publications
    Abstract

    Transitional millisecond pulsars are millisecond pulsars that switch between a rotation-powered millisecond pulsar state and an accretion-powered X-ray binary state, and are thought to be an evolutionary stage between neutron star low-mass X-ray binaries and millisecond pulsars. So far, only three confirmed systems have been identified in addition to a handful of candidates. We present the results of a multiwavelength study of the low-mass X-ray binary NGC 6652B in the globular cluster NGC 6652, including simultaneous radio and X-ray observations taken by the Karl G. Jansky Very Large Array and the Chandra X-ray Observatory, and optical spectroscopy and photometry. This source is the second brightest X-ray source in NGC 6652 (Lx~1.8 × 1034 erg, s-1) and is known to be variable. We observe several X-ray flares over the duration of our X-ray observations, in addition to persistent radio emission and occasional radio flares. Simultaneous radio and X-ray data show no clear evidence of anticorrelated variability. Optical spectra of NGC 6652B indicate variable, broad H α emission that transitions from double-peaked emission to absorption over a time-scale of hours. We consider a variety of possible explanations for the source behaviour, and conclude that based on the radio and X-ray luminosities, short time-scale variability and X-ray flaring, and optical spectra, NGC 6652B is best explained as a transitional millisecond pulsar candidate that displays prolonged X-ray flaring behaviour. However, this could only be confirmed with observations of a change to the rotation-powered millisecond pulsar state.

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