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arXiv 1001.2671astro-ph.HEastro-ph.SR
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曲率辐射引起的脉冲星圆偏振

Circular Polarization in Pulsars due to Curvature Radiation

R. T. Gangadhara

摘要:

相对论性等离子体(粒子或束团)的射束辐射,被约束沿着弯曲的轨道运动,发生在速度的方向。我们推广了相干曲率辐射模型,使之包含了脉冲星磁层辐射区的详细几何结构,并根据斯托克斯参数推导了偏振态。通过考虑均匀辐射和调制辐射,我们模拟了几个典型的脉冲轮廓。反对称类型的圆偏振只在发射源中存在调制或离散分布时才存在。我们的模型预测的偏振角摆动和圆偏振的符号反转之间的相关性作为一个几何性质的发射过程。

英文摘要:

The beamed radio emission from relativistic plasma (particles or bunches), constrained to move along the curved trajectories, occurs in the direction of velocity. We have generalized the coherent curvature radiation model to include the detailed geometry of the emission region in pulsar magnetosphere, and deduced the polarization state in terms of Stokes parameters. By considering both the uniform and modulated emissions, we have simulated a few typical pulse profiles. The antisymmetric type of circular polarization survives only when there is modulation or discrete distribution in the emitting sources. Our model predicts a correlation between the polarization angle swing and sign reversal of circular polarization as a geometric property of the emission process.

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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