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22nd of June 2020
The candidate transitional millisecond pulsar 3FGL J0427.9−6704
by Li et al.
Li et al. report new simultaneous XMM-Newton and Australia Telescope Compact Array observations of 3FGL J0427.9−6704, a candidate member of the enigmatic class of transitional millisecond pulsars. 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 ~20 hour X-ray observation. The X-ray and optical light curves are dominated by strong flares on time-scales of 10~100 sec. In addition, each light curve shows three eclipses, at the predicted times. In contrast, the figure above shows the ATCA 5.5 and 9.0 GHz light curve. The radio continuum data show only modest variability but no clear flares, and there is no evidence that the radio emission is eclipsed (the greyed time-ranges), which is 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. The paper has been published in the Astrophysical Journal.

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