Coherent Inverse Compton Scattering Responsible for Pulsar Polarized and Unpolarized Emission
Coherent Inverse Compton Scattering Responsible for Pulsar Polarized and Unpolarized Emission
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相干逆康普顿散射导致脉冲星偏振和非偏振发射
DOI：
10.1088/0256-307x/16/7/026
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发表时间：
1999
影响因子：
3.5
通讯作者：
R. Xu
中科院分区：
文献类型：
--
作者：
Jifeng Liu;G. Qiao;R. Xu
利用相干逆康普顿散射（ICS）机制研究了射电辐射的偏振特性。发现粒子沿半径为θ' =1/（γ）的圆环沿着运动时，通过相干的ICS同时起作用。圆偏振和线偏振可以同时得到。我们的理论解除了曲率辐射对洛伦兹因子γ ≤ 20的限制，在ICS中γ可以达到几千。此外，子脉冲位置角确实采取不同的值，而平均位置角与磁场线的投影相关联。因此，很自然地得到常见的S形摆动的平均位置角。最后对PSR 1508 +55的位置角旋转、线极化、圆极化进行了仿真，结果表明相干ICS可能是产生无线电发射的主要原因。
A coherent inverse Compton scattering (ICS) mechanism is used to get polarization properties of radio emission of pulsars. It is found that particles moving along a ring with radius θ' =1/(γ) simultaneously contribute via coherent ICS. The circular polarization can be easily gotten as well as linear polarization at the same time. Our theory releases the upper limit of Lorentz factor γ ≤ 20 put by curvature radiation, and γ may take several thousands in ICS. Furthermore, subpulse position angles do take diverse values, while mean position angle is associated with the projection of magnetic field lines. So it is natural to get commonly-seen S-shaped swing of mean position angles. Finally we present a simulation for position angle rotation, linear polarization, circular polarization of PSR1508+55, which means that the coherent ICS may be responsible for radio emission.