2026-07-02 中国科学院（CAS）
Harmonic-resolved fluctuation power spectra for PSR J0846−3533. (Image by XAO)
＜関連情報＞
- https://english.cas.cn/newsroom/research-news/202607/t20260702_1175343.shtml
- https://iopscience.iop.org/article/10.3847/1538-4357/ae6858
パルサーJ0846–3533の多面的な放射変動：周期的な振幅変調、モード切り替え、およびパルスヌル Multifaced Emission Variability of Pulsar J0846–3533: Periodic Amplitude Modulation, Mode Switching, and Pulse Nulling
Zhen Wang, Zhigang Wen, Jianping Yuan, Na Wang, Wenming Yan, Wei Han, and Xuefeng Duan
The Astrophysical Journal Published: 2026 May 28
DOI:10.3847/1538-4357/ae6858
Abstract
We present a comprehensive single-pulse analysis of the isolated rotation-powered pulsar J0846−3533 (B0844−35) using ultrawideband observations from the Parkes 64 m radio telescope across two epochs, totaling 11,103 single pulses. Our study reveals three key emission variability phenomena coexisting in this pulsar: periodic amplitude modulation, mode switching, and intermittent nulling. The nulling fraction is measured to be an upper limit of ∼11%. Mode switching occurs between two distinct states: a normal mode dominated by the trailing component and an abnormal mode with a significantly enhanced central component, transitioning over a few pulse periods. Fluctuation spectral analysis identifies stable periodic amplitude modulation with a periodicity of two rotational periods, which persists across both observational epochs. These findings suggest that mode switching and nulling arise from large-scale magnetospheric current rearrangements, while the periodic amplitude modulation reflects recurrent reconfiguration of particle acceleration and plasma emission efficiency. This multifaceted variability provides critical constraints on unifying models of pulsar magnetospheric dynamics.
