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Lookup NU author(s): Dr Anne ArchibaldORCiD
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© 2021. The American Astronomical Society. All rights reserved. 3FGL J1544.6-1125 is a candidate transitional millisecond pulsar (tMSP). Similar to the well-established tMSPs - PSR J1023+0038, IGR J18245-2452, and XSS J12270-4859 - 3FGL J1544.6-1125 shows γ-ray emission and discrete X-ray "low"and "high"modes during its low-luminosity accretion-disk state. Coordinated radio/X-ray observations of PSR J1023+0038 in its current low-luminosity accretion-disk state showed rapidly variable radio continuum emission - possibly originating from a compact, self-absorbed jet, the "propellering"of accretion material, and/or pulsar moding. 3FGL J1544.6-1125 is currently the only other (candidate) tMSP system in this state, and can be studied to see whether tMSPs are typically radio-loud compared to other neutron star binaries. In this work, we present a quasi-simultaneous Very Large Array and Swift radio/X-ray campaign on 3FGL J1544.6-1125. We detect 10 GHz radio emission varying in flux density from 47.7 ± 6.0 μJy down to ≲15 μJy (3σ upper limit) at four epochs spanning three weeks. At the brightest epoch, the radio luminosity is L 5 GHz = (2.17 ± 0.17) × 1027 erg s-1 for a quasi-simultaneous X-ray luminosity L 2-10 keV = (4.32 ± 0.23) × 1033 erg s-1 (for an assumed distance of 3.8 kpc). These luminosities are close to those of PSR J1023+0038, and the results strengthen the case that 3FGL J1544.6-1125 is a tMSP showing similar phenomenology to PSR J1023+0038.
Author(s): Jaodand AD, Deller AT, Gusinskaia N, Hessels JWT, Miller-Jones JCA, Archibald AM, Bogdanov S, Bassa C, Wijnands R, Patruno A, Sanidas S
Publication type: Article
Publication status: Published
Journal: Astrophysical Journal
Year: 2021
Volume: 923
Print publication date: 10/12/2021
Online publication date: 07/12/2021
Acceptance date: 21/08/2021
ISSN (print): 0004-637X
ISSN (electronic): 1538-4357
Publisher: IOP Publishing Ltd
URL: https://doi.org/10.3847/1538-4357/ac1ff7
DOI: 10.3847/1538-4357/ac1ff7
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