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arXiv 1903.06362astro-ph.HE
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用FAST观测PSR B2016 $+$ 28的辐射结构

The Radiation Structure of PSR B2016$+$28 Observed with FAST

Jiguang Lu, Bo Peng, Renxin Xu, Meng Yu, Shi Dai, Weiwei Zhu, Ye-Zhao Yu, Peng Jiang, Youling Yue, Lin Wang, FAST Collaboration

摘要:

利用最大碟形500米口径球面射电望远镜(FAST)对PSR B 2016 $+$ 28的平均脉冲和单脉冲进行了详细研究,特别是对单脉冲结构进行了详细分析。不同频率下的平均脉冲轮廓可以很好地拟合在一个圆锥模型中,强度依赖的脉冲轮廓的峰值分离随着强度增加。积分脉冲具有明显的频率依赖性(脉冲宽度随频率从300 MHz增加到750 MHz而减小$\sim\,20\%$),但单脉冲的结构变化很小(相应的相关尺度仅减小$\sim\,1\%$)。平均脉冲和单脉冲之间的这种差异为RS型真空内隙的存在提供了独立的证据,表明脉冲星表面粒子之间存在强键。对扩散漂移子脉冲进行了分析。结果表明,脉冲序列的调制周期($P_3$)与相邻子脉冲的间隔($P_2$)成正相关关系。这种相关性可能暗示了脉冲星上的粗糙表面,最终导致火花的不规则漂移。这些观测结果对脉冲星磁层动力学的研究具有重要意义,本文对此进行了广泛的讨论。

英文摘要:

With the largest dish Five-hundred-meter Aperture Spherical radio Telescope (FAST), both the mean and single pulses of PSR B2016$+$28, especially including the single-pulse structure, are investigated in detail in this study. The mean pulse profiles at different frequencies can be well fitted in a conal model, and the peak separation of intensity-dependent pulse profiles increases with intensity. The integrated pulses are obviously frequency dependent (pulse width decreases by $\sim\,20\%$ as frequency increases from 300 MHz to 750 MHz), but the structure of single pulses changes slightly (the corresponding correlation scale decreases by only $\sim\,1\%$). This disparity between mean and single pulses provides independent evidence for the existence of the RS-type vacuum inner gap, indicating a strong bond between particles on the pulsar surface. Diffused drifting sub-pulses are analyzed. The results show that the modulation period along pulse series ($P_3$) is positively correlated to the separation between two adjacent sub-pulses ($P_2$). This correlation may hint a rough surface on the pulsar, eventually resulting in the irregular drift of sparks. All the observational results may have significant implications in the dynamics of pulsar magnetosphere and are discussed extensively in this paper.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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