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arXiv 0709.3173astro-ph
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射电脉冲星脉冲间辐射物理

Physics of Interpulse Emission in Radio Pulsars

S. A. Petrova

摘要:

研究了脉冲星超相对论正负电子等离子体粒子的磁化诱导康普顿散射。主要的注意力是支付给横向制度的散射,这在一个中等强度的磁场。我们专门研究的问题,感应横向散射的无线电波束到背景中,这发生在一个脉冲星的开放场线管。在这种情况下,辐射主要向后散射,并且散射分量可能显著增长。基于这一效应,我们首次提出了某些类星体剖面中观测到的脉间辐射的物理解释。我们的模型可以很自然地解释脉冲间的特殊光谱和偏振特性。此外,它意味着一个特定的连接的脉冲间的主脉冲,这可能会揭示自己在一致的强度波动的组件在不同的时间尺度。详细讨论了这种联系的各种观测表现,包括PSR B1822-09的模行为,蟹状星云脉冲星巨脉冲的特殊时间和频率结构,以及PSR B1702-19主脉冲和脉冲间的子脉冲模式的本征相位对应。也有人认为,脉冲到脉冲的散射效率的波动可能会导致强烈的变化的脉冲间,这是有待观察研究。特别是,一些雷达可能表现出瞬态脉冲间,即散射分量可能只是偶尔才能检测到。

英文摘要:

The magnetized induced Compton scattering off the particles of the ultrarelativistic electron-positron plasma of pulsar is considered. The main attention is paid to the transverse regime of the scattering, which holds in a moderately strong magnetic field. We specifically examine the problem on induced transverse scattering of the radio beam into the background, which takes place in the open field line tube of a pulsar. In this case, the radiation is predominantly scattered backwards and the scattered component may grow considerably. Based on this effect, we for the first time suggest a physical explanation of the interpulse emission observed in the profiles of some pulsars. Our model can naturally account for the peculiar spectral and polarization properties of the interpulses. Furthermore, it implies a specific connection of the interpulse to the main pulse, which may reveal itself in the consistent intensity fluctuations of the components at different timescales. Diverse observational manifestations of this connection, including the moding behavior of PSR B1822-09, the peculiar temporal and frequency structure of the giant interpulses in the Crab pulsar, and the intrinsic phase correspondence of the subpulse patterns in the main pulse and the interpulse of PSR B1702-19, are discussed in detail. It is also argued that the pulse-to-pulse fluctuations of the scattering efficiency may lead to strong variability of the interpulse, which is yet to be studied observationally. In particular, some pulsars may exhibit transient interpulses, i.e. the scattered component may be detectable only occasionally.

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