1. Independent discovery of a nulling pulsar with unusual sub-pulse drifting properties with the Murchison Widefield Array
- Author
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McSweeney, Samuel J., Bhat, N. D. Ramesh, Swainston, Nicholas A., Smith, Keegan R., Kudale, Sanjay, Hancock, Paul, van Straten, Willem, Dai, Shi, Shannon, Ryan M., Tingay, Steven J., Johnston-Hollitt, Melanie, Kaplan, David L., and Walker, Mia
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
We report the independent discovery of PSR J0027-1956 with the Murchison Widefield Array (MWA) in the ongoing Southern-sky MWA Rapid Two-meter (SMART) pulsar survey. J0027-1956 has a period of ~1.306 s, a dispersion measure (DM) of ~20.869 pc cm^-3 , and a nulling fraction of ~77%. This pulsar highlights the advantages of the survey's long dwell times (~80 min), which, when fully searched, will be sensitive to the expected population of similarly bright, intermittent pulsars with long nulls. A single-pulse analysis in the MWA's 140-170 MHz band also reveals a complex sub-pulse drifting behavior, including both rapid changes of the drift rate characteristic of mode switching pulsars, as well as a slow, consistent evolution of the drift rate within modes. In some longer drift sequences, interruptions in the otherwise smooth drift rate evolution occur preferentially at a particular phase, typically lasting a few pulses. These properties make this pulsar an ideal test bed for prevailing models of drifting behavior such as the carousel model., Comment: Accepted for publication in ApJ
- Published
- 2022
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