强磁场中多次康普顿散射的统计特征
Statistical features of multiple Compton scattering in a strong magnetic field
摘要：
康普顿散射是强磁化中子星吸积过程中形成谱和吸积流动力学的关键过程。强磁场影响散射截面，使其依赖于光子能量、动量和偏振态。利用蒙特卡罗模拟研究了强磁场中极化X射线康普顿散射的统计特性。我们的分析集中在光子气体的行为以及散射区域内。我们考虑到在基本回旋频率的共振散射，在地面朗道水平的电子的热分布，和体积速度的电子气。结果表明：（1）静止电子气在回旋能量附近散射的光子，在很小的色散量下，最终获得的能量接近回旋能量，（2）在回旋共振的多普勒核内光子的再分布与完全再分布有很大的不同;（iii）从光子到电子气的动量转移的效率受电子气的温度影响，对于处于回旋能量和低于回旋能量的光子都是如此;（iv）在磁散射的情况下，从光子到非零体速度的电子气的动量转移更有效。
英文摘要：
Compton scattering is a key process shaping spectra formation and accretion flow dynamics in accreting strongly magnetized neutron stars. A strong magnetic field affects the scattering cross section and makes it dependent on photon energy, momentum, and polarization state. Using Monte Carlo simulations, we investigate statistical features of Compton scattering of polarized X-ray radiation in a strong magnetic field. Our analysis is focused on photon gas behaviour well inside the scattering region. We take into account the resonant scattering at the fundamental cyclotron frequency, thermal distribution of electrons at the ground Landau level, and bulk velocity of the electron gas. We show that (i) the photons scattered around the cyclotron energy by the electron gas at rest tend to acquire the final energy close to the cyclotron one with a very small dispersion measure; (ii) the redistribution of photons within the Doppler core of cyclotron resonance differs significantly from the complete redistribution; (iii) the efficiency of momentum transfer from photons to the electron gas is affected by the temperature of electron gas both for photons at cyclotron energy and below it; (iv) the momentum transfer from photons to the electron gas of non-zero bulk velocity is more efficient in the case of magnetic scattering.
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