Radio pulsations from the γ-ray millisecond pulsar PSR J2039-5617
Date Issued
2021
Author(s)
•
Mignani, R. P.
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Seyffert, A. S.
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Clark, C. J.
•
Venter, C.
•
Nieder, L.
•
•
•
Belfiore, A.
•
•
•
Wadiasingh, Z.
Abstract
The predicted nature of the candidate redback pulsar 3FGL J2039.6-5618 was recently confirmed by the discovery of γ-ray millisecond pulsations (Clark et al., hereafter Paper I), which identify this γ-ray source as PSR J2039-5617. We observed this object with the Parkes radio telescope in 2016 and 2019. We detect radio pulsations at 1.4 and 3.1 GHz, at the 2.6 ms period discovered in γ-rays, and also at 0.7 GHz in one 2015 archival observation. In all bands, the radio pulse profile is characterized by a single relatively broad peak which leads the main γ-ray peak. At 1.4 GHz, we found clear evidence of eclipses of the radio signal for about half of the orbit, a characteristic phenomenon in redback systems, which we associate with the presence of intra-binary gas. From the dispersion measure of 24.57 ± 0.03 pc cm-3, we derive a pulsar distance of 0.9 ± 0.2 or 1.7 ± 0.7 kpc, depending on the assumed Galactic electron density model. The modelling of the radio and γ-ray light curves leads to an independent determination of the orbital inclination, and to a determination of the pulsar mass, qualitatively consistent to the results in Paper I.
Volume
502
Issue
1
Start page
935
Issn Identifier
0035-8711
Ads BibCode
2021MNRAS.502..935C
Rights
open.access
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