偏轴伽玛暴辐射的数值分析研究

发布时间：2018-09-16 21:14

【摘要】：伽玛射线暴(简称伽玛暴,GRB)是一种来自宇宙空间的短时标伽玛射线突然爆发现象,这也是自宇宙大爆发以来人类观测到的最剧烈的恒星级爆发现象。在本论文里我们介绍了伽玛暴的观测历史,标准的火球激波模型,中心能源机制等理论基础,以及伽玛暴的辐射机制,包括：火球的动力学演化,同步辐射,逆康普顿散射效应,同步自吸收以及等时面效应。在此基础上,本论文针对伽玛暴观测中可能存在的偏轴观测情况,考虑了火球的动力学演化,同步辐射,逆康普顿效应,同步自吸收以及等时面效应,我们用数值分析方式计算了伽玛暴单成分流模型下偏轴观测的辐射,得到了在不同各向同性能量下的同一波段的光变曲线。随之对伽玛暴的双成分流模型也进行了偏轴观测的数值计算,给出了偏轴观测的观测角不同情况下的X射线、光学和红外波段的光变曲线,并与X射线闪进行了对比。最后基于Aloy在2005年的数值模拟工作,我们对短暴的双成分流进行了偏轴观测的数值计算,给出了X射线、光学和红外波段的光变曲线,发现不论在中心喷流张角内还是张角外其红外波段的流量都很高,最高可达到1mJy。该红外鼓包流量比SGRB130603B的微超新星的红外鼓包高出了三个量级,我们期望该红外鼓包可以在未来被观察到。
[Abstract]:Gamma-ray burst (GRB) is a kind of short-time gamma-ray burst phenomenon from space, which is also the most severe stellar burst phenomenon observed since the cosmic eruption. In this paper, we introduce the observation history of gamma-ray burst, the theoretical basis of standard fireball shock wave model, central energy mechanism, and the radiation mechanism of gamma-ray storm, including: dynamics evolution of fireball, synchrotron radiation, etc. Inverse Compton scattering effect, synchronous self absorption and isochronous effect. On this basis, the dynamic evolution of fireball, synchrotron radiation, inverse Compton effect, synchronous self-absorption and isochronous effect are considered in this paper. In this paper, we use numerical analysis method to calculate the radiation observed in the skew axis under the Gamma burst monoclinic model, and obtain the optical variation curves of the same wave band under different isotropic energies. Then the numerical calculation of the biaxial observation for the model of gamma ray burst is carried out, and the X-ray, optical and infrared light variation curves are given under different observation angles of the skew axis, and are compared with the X-ray flicker. Finally, based on the numerical simulation work of Aloy in 2005, we calculated the biaxial observation of the short storm, and gave the X-ray, optical and infrared wavebands. It is found that the flow rate in the infrared band is very high both inside and outside the central jet angle, and the maximum is 1 mJY. The flow rate of the infrared drum is three orders of magnitude higher than that of the SGRB130603B microsupernova. We expect that the infrared drum can be observed in the future.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P172.3

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