集成脉冲轮廓的高偏振分量
Highly polarized components of integrated pulse profiles
摘要：
通过对观测资料的分析和对发射过程的模拟，研究了脉冲廓线的高偏振分量。高偏振分量出现在脉冲轮廓的前部或后部，与低偏振分量相比，其优选地具有平坦的光谱和平坦的偏振角曲线。通过考虑脉冲星的辐射过程和传播效应，模拟了脉冲星辐射光束中波模和分数线偏振的分布。我们表明，高度极化的组件可以出现在领先的，中心的，和/或拖尾部分的脉冲轮廓的模型，这取决于脉冲星的几何形状。退偏振是由正交模式或散射引起的。当视线与脉冲星发射光束相交时，入射角很小，探测到的高偏振分量为O模，偏振角曲线平坦，光谱平坦。否则，高偏振分量将是X模式的，并且具有陡峭的偏振角曲线。
英文摘要：
Highly polarized components of pulse profiles are investigated by analyzing observational data and simulating the emission processes. The highly polarized components appear at the leading or trailing part of a pulse profile, which preferably have a flat spectrum and a flat polarization angle curve compared with the low polarized components. By considering the emission processes and propagation effects, we simulate the distributions of wave modes and fractional linear polarization within the entire pulsar emission beam. We show that the highly polarized components can appear at the leading, central, and/or trailing parts of pulse profiles in the models, depending on pulsar geometry. The depolarization is caused by orthogonal modes or scattering. When a sight line cuts across pulsar emission beam with a small impact angle, the detected highly polarized component will be of the O mode, and have a flat polarization angle curve and/or a flat spectrum as observed. Otherwise, the highly polarized component will be of the X mode and have a steep polarization angle curve.
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