Tomasz Nowakowski is a writer for Phys.org.
The Chinese have used the Five-hundred-meter Aperture Spherical radio Telescope (FAST) to investigate the emission phenomena of a pulsar. The results of the study were published on the arXiv pre-print repository.
The rotating neutron stars emit a beam of radiation. They are usually detected in the form of short bursts of radio emission.
Some pulsars show variability in emission ranging from short bursts to long-term changes. Mode-changing has been observed in which the emission profile switches between two or more quasi-stable modes of emission.
The spin period is 0.64 seconds and the dispersion measure is 252.8 cm. There are abnormal emission phenomena that can be seen in the form of shifts of emission to an early rotational phase and mode change of emission at the normal phase.
The Key Laboratory of FAST, led by Lin Wang, decided to conduct broad-band radio observations of PSR B1859+07 using the Ultra-Wideband receiver.
Wang's team managed to generate 22,769 individual pulse in total, and capture 123 emission shift events. The emission shift mode with a quasi-periodicity of 155 pulse was confirmed by the study.
The authors of the paper explained that the results show that all three emission modes have the same PA distributions.
The average profiles of the B and Q modes were generated by the researchers. They found that the profiles of the two modes show evolution with frequencies.
A new type of emission shift events was found in PSR B1859+07 with emission at both the shift and non-shift phase. The unusual emission shift events observed from this source could be a result of the emission beam asymmetry, the change of the pulsar magnetosphere, or both. It is necessary to use high sensitivity telescopes in order to draw conclusions from the emission phenomena of PSR B1859+07 and other pulsars.
More information: Lin Wang et al, The unusual emission from PSR B1859+07 with FAST. arXiv:2201.06815v1 [astro-ph.HE], arxiv.org/abs/2201.06815The Science X Network will be launched in 2022.
Citation: Unusual emission from pulsar PSR B1859+07 examined with FAST (2022, January 25) retrieved 26 January 2022 from https://phys.org/news/2022-01-unusual-emission-pulsar-psr-b185907.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
All Rights Reserved © 2024
