Using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), a research team led by Prof. Han Jinlin from the National Astronomical Observatories of the Chinese Academy of Sciences (NAOC) has detected distinct 'dwarf pulses' from a bright pulsar PSR B2111+46, studied the radio emission in unprecedented detail and probed the unknown physics in the magnetosphere.
Pulsar radio emission from thunderstorms and raindrops of particles in the magnetosphere of PSR B2111+46 detected by FAST. Credit: NAOC
PSR B2111+46 is a relatively old pulsar, and scientists have long known that that emission from this pulsar often nulls for periods of time. However, dozens of unusually weak, very narrow pulses—previously unobserved—were detected during ordinary nulling periods when it was serendipitously observed on Aug. 24, Aug. 26 and Sept. 17, 2020, as part of the Galactic Plane Pulsar Snapshot survey, a key project of the FAST to hunt pulsars.
To verify this new kind of emission state, the researchers observed this pulsar for two hours again on March 8, 2022."Finally, we picked out 175 such narrow, weak pulses," said Dr. Chen Xue, the first author of the study. According to Dr. Chen, such pulses stand out from normal pulses in terms of pulse width and energy, and thus have been named"dwarf pulses."
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