几何射电脉冲星信号模型中非双折射起源的正交偏振模式
Orthogonal polarization modes of nonbirefringent origin in a geometric radio pulsar signal model
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中文总结 AI 辅助
该研究提出一种几何脉冲星信号模型，证明仅通过辐射平均效应而非双折射，即可产生两种正交偏振模式，与观测特性相符。
中文摘要 AI 辅助
脉冲星磁层中等离子体的运动本质上遵循弯曲的磁场线，这可能导致辐射束扫过观测者的视线。我们证明，在某些条件下，这种经过的波束仅通过辐射贡献的平均化即可产生两种正交偏振模式（OPMs），而无需涉及双折射。这要求来自通过不同阶段的辐射是非相干贡献的，因此相干时间尺度远短于典型采样时间。该模型产生数量相当的两个OPMs，具有广泛的（单脉冲）偏振分数范围，这与一般观测到的脉冲星特性一致。在所需的具体条件下（本质上是在适当时间尺度上的非相干信号求和），仅平均效应就能导致出现两个正交偏振轨迹及OPM跳变。
英文摘要
Motion of plasma in pulsar magnetospheres essentially follows bent magnetic field lines which may result in radiation beams sweeping past the observer's sightline. We show that under certain conditions such a passing beamlet can produce two orthogonal polarization modes (OPMs) solely from averaging of radiative contributions, without involving birefringence. This requires that radiation from different stages of the passage is contributed incoherently, hence that the timescale for the coherence is much shorter than the typical sampling time. The model produces two OPMs of comparable amount, with a wide range of (single-pulse) polarized fractions, which is consistent with general observed pulsar properties. Under the specific conditions required (essentially incoherent summation of signal at appropriate time scale) the averaging effects alone can thus lead to the appearance of two orthogonal polarization tracks with OPM jumps.
发表机构
- Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences（尼古拉·哥白尼天文中心，波兰科学院）
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