脉冲星风云辐射理论研究

发布时间：2018-01-03 04:09

本文关键词：脉冲星风云辐射理论研究　出处：《云南大学》2016年硕士论文　论文类型：学位论文

【摘要】：脉冲星风云是银河系内重要的高能辐射与高能粒子源。脉冲星不断将能量以极端相对论粒子及磁流的形式注入到周围星风云中,带电粒子受终端激波作用而被加速至相对论性,并通过同步辐射、逆康普顿散射产生从射电一直到甚高能伽马射线段的非热辐射。尽管对脉冲星风云的研究在观测和理论方面均取得诸多进展,但其中发生的粒子加速过程、传播细节及辐射机制等问题尚不够清楚。本文利用含时演化模型,研究脉冲星风云的多波段辐射特征,主要工作如下：首先,我们利用单区演化模型,研究了两颗具有多波段观测能谱的脉冲星风云MSH 15-52和G0.9+0.1的多波段非热辐射特征。计算结果显示,采用双幂律指数截断的注入谱,在合理参数下这两个源的多波段辐射能谱均可得到解释,射电及X射线辐射产生于电子的同步辐射,而高能伽马射线通过逆康普顿散射产生。对脉冲星风云MSH 15-52,其低能段(3.0×105)的粒子具有幂律指数～1.5,而更高能段(3.0×105)的粒子具有幂律指数～2.2。对脉冲星风云G0.9+0.1,其低能段(0.2×105)的粒子具有幂律指数～1.2,而更高能段(0.2×105)的粒子具有幂律指数～2.5。其次,我们利用多区模型研究了在伽马射线波段具有空间分辨观测结果的源HESS J1825-137的辐射特征。观测显示,这个源的辐射具有距离脉冲星越远,谱越软的特征。结果显示,采用谱指数～2.3的单幂律指数截断注入谱,给出的具有空间分辨的辐射谱可以对在X射线和伽马射线波段的观测给予很好解释,来自各区的X射线辐射均产生于电子同步辐射,高能伽马射线来自于相应的逆康普顿散射。
[Abstract]:The pulsar is an important situation in the Milky Way high-energy radiation particles with energy source. The pulsar will continue to energy of relativistic particles and magnetic flux form into the star around the situation, by the end of the shock wave and the charged particles are accelerated to relativistic, and through synchrotron radiation, inverse Compton scattering has been generated from the radio the non thermal radiation of very high energy gamma ray line. Although studies on pulsar have made much progress in the observation and theory, but the particle acceleration, propagation details and emission mechanisms are still not clear. The evolution of models with time by using of multi band radiation characteristics of the pulsar wind. The main work is as follows: firstly, we use the single zone evolution model, multi band of two satellites with multi band spectral pulsar MSH 15-52 cloud and G0.9+0.1 non thermal radiation gauge features. The results showed that the injection spectrum of two truncated power-law index, under reasonable parameter of multi band radiation of the two source spectra can be explained, and the radio synchrotron radiation X ray radiation produced by electrons, and high-energy gamma rays produced by inverse Compton scattering of the pulsar. FY MSH 15-52, its low energy range (3 x 105) particles have a power-law index to 1.5, while the more high energy (3 x 105) particles with the power-law index ~ 2.2. of pulsar FY G0.9+0.1, the low energy (0.2 x 105) particles have a power-law index to 1.2, while the more high energy (0.2 x 105). The particle has a power-law index ~ 2.5. secondly, we use the multi zone model of radiation characteristic of spatial resolution observations of the source HESS J1825-137 in the gamma ray. The observation shows that the radiation source is from the pulsar farther, more soft spectrum. The results showed that the spectrum of Single power-law index truncation ~ 2.3 injection with radiation spectrum, spatial resolution spectrum can give a good explanation to the observation in X ray and gamma ray are given, the X radiation from the districts are produced in the electron synchrotron radiation, high-energy gamma rays from inverse Compton scattering accordingly.

【学位授予单位】：云南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P145.6

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