双层外间隙模型在类Vela脉冲星中的应用

发布时间：2018-04-20 01:41

本文选题：脉冲星 + 高能辐射　；参考：《云南大学》2015年硕士论文

【摘要】：脉冲星是高速转动的中子星,由于其能提供地面实验室所不能提供的极端物理条件,在物理学和天文学中具有重要的研究价值。脉冲星是典型的伽玛射线源,自2008年Fermi伽玛射线空间望远镜投入使用以来,已探测到160多颗伽玛射线脉冲星,其提供的详细观测资料为人们深入研究脉冲星磁层中发生的物理过程提供了可能。在本文中,我们利用双层外间隙模型研究了两颗类Vela脉冲星的高能辐射特性。双层外间隙模型由Wang et al(2010)提出,在该模型中,外间隙被分为两个部分,即加速区和屏蔽区。加速区位于最后开场线之上,其中电荷密度比Goldreich-Julian密度低得多,粒子被平行电场加速到相对论性能量,通过曲率辐射产生数GeV的高能辐射。而屏蔽区位于加速区和外间隙上边界之间,电荷密度大于Goldreich-Julian密度从而闭合了外间隙,主要产生数百MeV的辐射。利用双层外间隙模型,Wang et al.(2011)解释了Vela脉冲星的高能辐射特性。在本文中,我们首先对脉冲星的基本性质和相关理论进行介绍,在此基础上,基于双层外间隙模型,详细研究了PSRJ1952+3252和PSR J2229+6114两颗类Vela脉冲星的高能辐射,分析了模型参数对计算结果的影响,较好的解释了相位平均谱和能量分离光变曲线。
[Abstract]:Pulsars are fast rotating neutron stars, which have important research value in physics and astronomy because they can provide extreme physical conditions that can not be provided by terrestrial laboratories. Pulsar is a typical gamma ray source. Since the Fermi Gamma Ray Space Telescope was put into use in 2008, more than 160 gamma ray pulsars have been detected. The detailed observational data provide a possibility for further study of the physical processes in the magnetosphere of pulsars. In this paper, we study the high energy radiation characteristics of two Vela like pulsars by using the double outer gap model. In this model, the outer gap is divided into two parts, namely, the acceleration zone and the shielding region. The acceleration region is located above the last opening line in which the charge density is much lower than the Goldreich-Julian density. The particles are accelerated to relativistic energy by parallel electric fields and the high energy radiation of a number of GeV is generated by curvature radiation. The shielding zone lies between the acceleration zone and the upper boundary of the outer gap, and the charge density is larger than the Goldreich-Julian density, thus closing the outer gap, which mainly produces hundreds of MeV radiation. The high-energy radiation characteristics of Vela pulsars are explained by using the double-layer outer gap model Wang et al.2011. In this paper, we first introduce the basic properties and related theories of pulsars. Based on the double-layer outer gap model, we study the high-energy radiation of PSRJ1952 3252 and PSR J2229 6114 pulsars in detail. The influence of the model parameters on the calculation results is analyzed, and the phase average spectrum and the energy separation photovariation curve are well explained.
【学位授予单位】：云南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P145.6

【共引文献】