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首页> 外文期刊>The Astrophysical journal >STATISTICAL MODELING OF THE CIRCULAR POLARIZATION IN PULSAR RADIO EMISSION AND DETECTION STATISTICS OF RADIO POLARIMETRY
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STATISTICAL MODELING OF THE CIRCULAR POLARIZATION IN PULSAR RADIO EMISSION AND DETECTION STATISTICS OF RADIO POLARIMETRY

机译：脉冲辐射中圆极化的统计建模与无线电极化的检测统计。

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摘要

Despite the diverse and seemingly complicated structure of the polarization of individual pulses from radio pulsars, many features of the emission are remarkably similar from pulsar to pulsar. These features include the statistical nature of the fluctuations in the emission's intensity and polarization and the ever-present orthogonal modes of polarization. Another persistent, but often neglected, feature of the emission is the wide, Gaussian-like distribution of fractional circular polarization at most pulse longitudes. This unimodal distribution cannot be explained by an emission model that assumes the orthogonal modes of polarization occur separately. However, the proposition that the modes occur simultaneously is consistent with the observations. Furmermore, a detailed analysis of the statistics of signal detection for radio polarimetry shows that the observed dispersion in the fractional circular polarization is larger than what one would expect from the instrumental noise or from fluctuations in total intensity. Large, pulsar-intrinsic fluctuations in the circular polarization are required to explain the observed distributions. In an attempt to exploit the general features of the emission and extract information regarding the mode polarizations, a statistical model of superposed modes of orthogonal polarization is extended to include circular polarization. The model attributes the large fluctuations in circular polarization required by the observations to a combination of the heavy modulation of the mode intensities and the small, but significant, degree of circular polarization that is intrinsic to the modes. The results of the model indicate that a small degree of mode-intrinsic circular polarization can explain the large fluctuations in fractional circular polarization that are observed. The general statistics of signal detection for linear polarization are also derived.
机译：尽管来自无线电脉冲星的单个脉冲的极化结构多样且看似复杂，但从脉冲星到脉冲星，其发射的许多特征非常相似。这些特征包括发射强度和偏振的波动的统计性质，以及不断出现的偏振正交模式。发射的另一个持久性但通常被忽略的特征是在大多数脉冲经度下分数圆极化的宽高斯样分布。这种单峰分布不能用假设偏振的正交模式分别发生的发射模型来解释。但是，模式同时发生的命题与观察结果一致。此外，对无线电极化信号检测统计数据的详细分析表明，在分数圆极化中观察到的色散大于仪器噪声或总强度波动中的色散。需要圆极化的大脉冲内在波动来解释观测到的分布。为了尝试利用发射的一般特征并提取有关模式偏振的信息，正交偏振叠加模式的统计模型被扩展为包括圆偏振。该模型将观测所需的圆极化的大波动归因于模式强度的重调制与模式固有的小但显着的圆极化度的组合。该模型的结果表明，少量的模式本征圆极化可以解释观察到的分数圆极化的大波动。还推导了线性极化信号检测的一般统计数据。

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