Using the FAST telescope, researchers discovered unique 'dwarf pulses' from pulsar PSR B2111+46, potentially unveiling unknown aspects of pulsar radiation and plasma conditions. Using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), a research team led by Prof. Jinlin Han from th
A team of astronomers discovered “dwarf pulses” from the pulsar PSR B2111+46 using the FAST telescope. Unlike regular pulsar emissions, these weak, narrow pulses represent a unique radiation state, often exhibiting a rare reversed spectrum. The study suggests that these pulses could help unveil the mysteries of pulsar radiation processes and the extreme plasma conditions within a pulsar’s magnetosphere.
Pulsar radio emission from thunderstorms and raindrops of particles in the magnetosphere of PSR B2111+46 detected by FAST. Credit: NAOC 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. Xue Chen, 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.”
These sporadic, weak, and narrow pulses constitute a new radiation state independent of normal pulses, and such pulses often exhibit a rare reversed spectrum, i.e., they have much stronger emission at higher radio frequencies, something that is very rarely detected in such a distinguished timescale from astronomical sources. “The properties of such dwarf pulses would be hard to be measured by other radio telescopes than FAST,” said Prof.
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