PSR J1926-0652: A Pulsar with Interesting Emission Properties Discovered at FAST
PSR J1926-0652: A Pulsar with Interesting Emission Properties Discovered at FAST
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PSR J1926-0652：FAST 发现的具有有趣发射特性的脉冲星
DOI：
10.3847/1538-4357/ab1849
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发表时间：
2019-05-20
影响因子：
4.9
通讯作者：
Zhu, Yan
中科院分区：
文献类型：
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作者：
Zhang, Lei;Li, Di;Zhu, Yan
我们描述了PSR J1926-0652，一颗最近由500米口径球面射电望远镜（FAST）发现的脉冲星。使用灵敏的单脉冲探测FAST和长期定时观测帕克斯64米射电望远镜，我们探讨了长时间和短时间尺度上的现象。FAST的观测覆盖了270至800 MHz的宽频率范围，从而能够对单个脉冲进行详细研究。脉冲星至少有四个剖面组成部分，持续4到450个脉冲的短期零化，复杂的子脉冲漂移行为和几十分钟尺度的不稳定性。虽然平均频带间隔P-3在不同的突发和分量上相对恒定，但是可以看到相邻频带的分离的显著变化，特别是在突发的开始和结束附近。谱带的形状和斜率变化很大，特别是对于拖尾分量和较短的爆发。我们表明，对于每个突发的最后可检测的脉冲之前，发射停止具有不同的属性相比，其他脉冲。这些复杂性对经典的旋转木马模型提出了挑战。
We describe PSR J1926-0652, a pulsar recently discovered with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). Using sensitive single-pulse detections from FAST and long-term timing observations from the Parkes 64 m radio telescope, we probed phenomena on both long and short timescales. The FAST observations covered a wide frequency range from 270 to 800 MHz, enabling individual pulses to be studied in detail. The pulsar exhibits at least four profile components, short-term nulling lasting from 4 to 450 pulses, complex subpulse drifting behaviors and intermittency on scales of tens of minutes. While the average band spacing P-3 is relatively constant across different bursts and components, significant variations in the separation of adjacent bands are seen, especially near the beginning and end of a burst. Band shapes and slopes are quite variable, especially for the trailing components and for the shorter bursts. We show that for each burst the last detectable pulse prior to emission ceasing has different properties compared to other pulses. These complexities pose challenges for the classic carousel-type models.