2026-07-02 中国科学院（CAS）
A single-pulse stack of 600 successive pulses of PSR B0751+32. (Image by XAO)
＜関連情報＞
- https://english.cas.cn/newsroom/research-news/202607/t20260702_1175345.shtml
- https://academic.oup.com/mnras/article/548/2/stag653/8644294
FASTを用いたPSR B0751+32における周期的ヌル化の研究 A study of periodic nulling in PSR B0751+32 with FAST
W M Yan,N Wang,F F Kou,Z Y Liu,J P Yuan,Z G Wen,S N Sun,M Y Zou,Y R Wen,X J Chen
Monthly Notices of the Royal Astronomical Society Published:08 April 2026
DOI:https://doi.org/10.1093/mnras/stag653
ABSTRACT
We report new results from a nulling study of PSR B0751+32 (PSR J0754+3231), observed at 1250 MHz with the Five hundred meter Aperture Spherical radio Telescope. Our analysis confirms the presence of periodic nulling in this pulsar. Using the recently developed mixture-model method, we obtained a nulling fraction of 35.1 per cent ±0.6 per cent . Three independent approaches were employed to estimate the nulling periodicity, and the results reveal significant temporal evolution of the modulation both within individual observations and across different sessions. The pulsar exhibits an asymmetric two-component mean pulse profile, with the leading component brighter and narrower than the trailing one. Pulse energy analysis shows that both components remain stable immediately after the onset of the burst state, but subsequently undergo a progressive decline, with the trailing component most severely affected prior to burst termination. Notably, no evidence of the previously reported subpulse drifting was detected in our data. Our results challenge previous models that ascribed periodic nulling to purely geometric effects.
