脉冲星同步—曲率辐射过程的研究
发布时间：2019-01-26 21:47
【摘要】：脉冲星是典型的银河伽马射线源,带电粒子可在加速区内被加速到相对论性能量,从而产生高能辐射。然而,加速区的位置、高能粒子的产生、辐射过程等物理问题一直不清楚。可能的理论模型包括外间隙模型,该模型最初由郑广生教授等人于1986年提出,在后续的研究中,郑广生教授及其合作者考虑了同步-曲率辐射过程,不断改进了模型。2014年Vigano详细考虑了外间隙模型中的同步-曲率辐射过程,对模型进行更深入的研究,给出了更加紧凑的计算公式。在本文中,我们基于Vigano改进的同步—曲率辐射公式,对脉冲星外间隙模型中电子的辐射过程做了进一步的研究,并用Fermi卫星给出的伽马射线脉冲星观测数据来检测该辐射模型,主要包括如下内容：1.根据电子的动力学方程进行了数值计算,给出了外间隙中运动电子的洛伦兹因子和投射角随位置的变化；2.给出了电子垂直和平行部分的能量和动量变化,直观呈现了电子早期从同步辐射到曲率辐射的过渡；3.利用改进的模型,运用LM方法拟合了33颗具有较好观测结果的年轻脉冲星大于100MeV能段的相位平均谱；4.估计了年轻脉冲星的伽马射线光度及转化效率并与观测对比,研究了伽马射线光度、转化效率、旋转能损率和特征年龄间的相关性。研究结果表明单纯的同步辐射或者曲率辐射都不足于描述带电粒子运动过程中的辐射,考虑了同步-曲率辐射的外间隙模型可以解释观测结果。
[Abstract]:Pulsar is a typical galactic gamma ray source. Charged particles can be accelerated to relativistic energy in the acceleration region, resulting in high energy radiation. However, the location of the acceleration region, the generation of high-energy particles and the radiation process have been unclear. Possible theoretical models include the outer gap model, which was first proposed by Professor Zheng Guangsheng and others in 1986. In subsequent studies, Professor Zheng Guangsheng and his collaborators considered synchrotron curvature radiation processes. In 2014, Vigano considered the synchrotron curvature radiation process in the outer clearance model in detail, studied the model more deeply, and gave a more compact formula. In this paper, based on the improved synchrotron curvature radiation formula of Vigano, we further study the radiation process of electrons in the pulsar outer gap model, and use the gamma ray pulsar observation data from Fermi satellite to detect the radiation model. The main contents are as follows: 1. The Lorentz factor and projection angle of the moving electron in the outer gap are calculated numerically according to the kinetic equation of the electron. 2. The energy and momentum variations of the vertical and parallel parts of the electron are given, and the transition from synchrotron radiation to curvature radiation in the early electron phase is intuitively presented. Using the improved model, the phase average spectra of 33 young pulsars with good observation results are fitted by using LM method. 4. The gamma ray luminosity and conversion efficiency of young pulsars are estimated and compared with observations. The correlation between gamma ray luminosity, conversion efficiency, rotational energy loss rate and characteristic age is studied. The results show that both synchrotron radiation and curvature radiation are insufficient to describe the radiation in the motion of charged particles. The external gap model of synchrotron curvature radiation can be used to explain the observed results.
【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
本文编号：2415941
[Abstract]:Pulsar is a typical galactic gamma ray source. Charged particles can be accelerated to relativistic energy in the acceleration region, resulting in high energy radiation. However, the location of the acceleration region, the generation of high-energy particles and the radiation process have been unclear. Possible theoretical models include the outer gap model, which was first proposed by Professor Zheng Guangsheng and others in 1986. In subsequent studies, Professor Zheng Guangsheng and his collaborators considered synchrotron curvature radiation processes. In 2014, Vigano considered the synchrotron curvature radiation process in the outer clearance model in detail, studied the model more deeply, and gave a more compact formula. In this paper, based on the improved synchrotron curvature radiation formula of Vigano, we further study the radiation process of electrons in the pulsar outer gap model, and use the gamma ray pulsar observation data from Fermi satellite to detect the radiation model. The main contents are as follows: 1. The Lorentz factor and projection angle of the moving electron in the outer gap are calculated numerically according to the kinetic equation of the electron. 2. The energy and momentum variations of the vertical and parallel parts of the electron are given, and the transition from synchrotron radiation to curvature radiation in the early electron phase is intuitively presented. Using the improved model, the phase average spectra of 33 young pulsars with good observation results are fitted by using LM method. 4. The gamma ray luminosity and conversion efficiency of young pulsars are estimated and compared with observations. The correlation between gamma ray luminosity, conversion efficiency, rotational energy loss rate and characteristic age is studied. The results show that both synchrotron radiation and curvature radiation are insufficient to describe the radiation in the motion of charged particles. The external gap model of synchrotron curvature radiation can be used to explain the observed results.
【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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