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Unusual Emission of A‘Black Widow’
2021-11-17| 【A A A【Print】【Close】


Black Widow (BW) and Rdebacks (RB) are an interesting subset of the pulsar population, and they jointly known as the spider pulsar system, which comprises a millisecond pulsar with a low-mass companion in short, near circulation orbits.  

A research team from pulsar research group at Xinjiang Astronomical Observatory (XAO) reported the results of an unusually bright observation of PSR J1720-0533, using the Five-hundred-meter Aperture Spherical radio Telescope (FAST).

Through fortunate coincidence, a particularly bright scintillation maximum is simultaneous with the eclipse of PSR J1720-0533. The unusually bright observation provides an opportunity to study the emission variations near the eclipse in detail. We found that there are quasi-periodic pulse emission variations with a modulation period of 22s during the ingress of the eclipse, which could be caused by plasma lensing. The linear polarization of the pulsar disappears before the eclipse, even before there is a visually obvious change in dispersion measure. Our results suggested the magnetic field maybe plays an important role in the eclipse mechanism of spider pulsars.

Fig. The upper panel shows the total intensity of pulse emission vs. pulsar spin and orbital phases with the sub-integration of 1 s of PSR J17200533. Enlargements of the ingress and egress of the pulsar are shown in the middle left and middle right panels, respectively. The bottom panels show the pulse flux density variations near the eclipse.



WANG Shuangqiang

Xinjiang Astronomical Observatory, Chinese Academy of Sciences



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