伽玛射线暴余辉和宿主星系的数据统计以及GRB 110918A的中心引擎模型
发布时间：2018-09-19 10:35
【摘要】：Vela卫星在1973年观测到了第一个伽玛射线暴,自此我们知道了伽玛射线暴是伽玛射线在短时间内突然增强的现象。随着探索伽玛射线暴的卫星发射升空和越来越多的地面观测站的建立,我们得到了更多伽玛射线暴的观测数据,尤其是Swift和Fermi卫星的发射升空,使我们进入了研究伽玛射线暴的新时代。本论文的研究主要集中在伽玛射线暴余辉及其宿主星系的数据统计方面:首先,本文的第一章是伽玛射线暴的概述,介绍了伽玛射线暴的观测历史和全局分布,并概括了伽玛射线暴的瞬时辐射和余辉的观测,以及由观测数据得到的一些重要的经验关系,同时也介绍了伽玛射线暴的宿主星系及其分布。其次,本文对伽玛射线暴的前身星、中心引擎模型和火球模型做了比较详细的介绍。主要介绍了三种可能的中心引擎模型:NDAF模型、BZ模型和磁星模型,并概括了伽玛射线暴的火球动力学和标准的火球激波模型。前两章是本人对伽玛射线暴基本知识的学习与理解,是完成硕士期间各项工作的基础。接下来是本人在硕士期间所做的一些工作。第三章主要介绍了GRB 110918A的多波段余辉数据拟合,考虑暴周围环境为星风和星际介质两种不同的情况,使用收集到的X射线、光学和近红外余辉数据,得到了光变曲线和余辉谱,以及两组拟合参数,通过对其初始洛伦兹因子、喷流张角等的限制,结合理论分析,判定GRB 110918A的中心引擎为BZ模型;第四章是探讨活动星系核(AGN)、太阳耀斑和冷星的射电光度和X射线光度的成比例关系是否可以扩展至伽玛射线暴,我们统计了47个伽玛射线暴的射电和X射线光度的数据,发现通过拟合得到的伽玛射线暴的射电光度和X射线光度存在类似的关系,表明不同尺度的天体很可能是相同的辐射机制;前两项工作主要涉及伽玛射线暴余辉数据的统计与拟合,而本人的第三项工作则是伽玛射线暴宿主星系的数据统计,而且我们建立了伽玛射线暴及其宿主星系的“数据统计大表格”,我主要负责统计伽玛射线暴宿主星系的形状、offset、金属丰度、绝对星等、AB星等、氢柱密度、消光、恒星形成率、年龄、质量等数据,并得到了8个关于宿主星系数据的统计直方图,此部分工作列于第五章。最后,总结了本文的主要内容,并且对伽玛射线暴及其宿主星系研究领域中待解决的问题做了展望。
[Abstract]:The first gamma-ray burst was observed by Vela satellite in 1973. Since then, we know that the gamma-ray burst is a phenomenon that the gamma ray suddenly increases in a short period of time. With the launch of satellites to explore gamma ray bursts and the establishment of more and more ground observation stations, we have obtained more observations of gamma ray bursts, especially the launch of Swift and Fermi satellites. This has ushered us into a new era in the study of gamma-ray bursts. This paper focuses on the statistical data of the afterglow of the gamma ray bursts and their host galaxies. Firstly, the first chapter of this paper is an overview of the gamma ray bursts, introducing the observational history and global distribution of the gamma ray bursts. The instantaneous radiation and afterglow observation of gamma ray bursts, as well as some important empirical relationships obtained from observed data, are summarized. The host galaxies and their distribution of gamma ray bursts are also introduced. Secondly, the star, center engine model and fireball model of gamma-ray burst are introduced in detail. This paper mainly introduces three possible central engine models: the BZ model and the magnetic star model, and summarizes the fireball dynamics of gamma ray bursts and the standard fireball shock wave model. The first two chapters are my basic knowledge and understanding of gamma ray bursts, which is the foundation of my master's work. The following is some of the work I did during my master's period. The third chapter mainly introduces the fitting of GRB 110918A multi-band afterglow data. Considering that the environment around the storm is starwind and interstellar medium, the light variation curve and afterglow spectrum are obtained by using the collected X-ray, optical and near-infrared afterglow data. According to the limitation of initial Lorentz factor and jet angle and theoretical analysis, the center engine of GRB 110918A is determined to be BZ model. Chapter 4 is to investigate whether the proportional relationship between radio and X-ray luminosity of (AGN), solar flares and cold stars in active galactic nuclei can be extended to gamma ray bursts. We have counted the radio and X-ray luminosity data of 47 gamma ray bursts. It is found that there is a similar relationship between the radio luminosity and the X-ray luminosity of the gamma ray bursts obtained by fitting, which indicates that the celestial bodies of different scales are likely to have the same radiation mechanism. The first two work mainly involves the statistics and fitting of the afterglow data of gamma ray bursts, while my third work is the statistics of the host galaxies of gamma ray bursts. And we've created a "big statistical table" of gamma-ray bursts and their host galaxies, and I'm mainly responsible for counting the shape of the host galaxy of the gamma-ray storm, the metal abundance, the absolute magnitude AB magnitude, the hydrogen column density, the extinction rate, the star formation rate. Eight statistical histograms of host galaxy data are obtained, which are listed in Chapter 5. Finally, the main contents of this paper are summarized, and the problems to be solved in the field of gamma-ray bursts and their host galaxies are prospected.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P172.3
[Abstract]:The first gamma-ray burst was observed by Vela satellite in 1973. Since then, we know that the gamma-ray burst is a phenomenon that the gamma ray suddenly increases in a short period of time. With the launch of satellites to explore gamma ray bursts and the establishment of more and more ground observation stations, we have obtained more observations of gamma ray bursts, especially the launch of Swift and Fermi satellites. This has ushered us into a new era in the study of gamma-ray bursts. This paper focuses on the statistical data of the afterglow of the gamma ray bursts and their host galaxies. Firstly, the first chapter of this paper is an overview of the gamma ray bursts, introducing the observational history and global distribution of the gamma ray bursts. The instantaneous radiation and afterglow observation of gamma ray bursts, as well as some important empirical relationships obtained from observed data, are summarized. The host galaxies and their distribution of gamma ray bursts are also introduced. Secondly, the star, center engine model and fireball model of gamma-ray burst are introduced in detail. This paper mainly introduces three possible central engine models: the BZ model and the magnetic star model, and summarizes the fireball dynamics of gamma ray bursts and the standard fireball shock wave model. The first two chapters are my basic knowledge and understanding of gamma ray bursts, which is the foundation of my master's work. The following is some of the work I did during my master's period. The third chapter mainly introduces the fitting of GRB 110918A multi-band afterglow data. Considering that the environment around the storm is starwind and interstellar medium, the light variation curve and afterglow spectrum are obtained by using the collected X-ray, optical and near-infrared afterglow data. According to the limitation of initial Lorentz factor and jet angle and theoretical analysis, the center engine of GRB 110918A is determined to be BZ model. Chapter 4 is to investigate whether the proportional relationship between radio and X-ray luminosity of (AGN), solar flares and cold stars in active galactic nuclei can be extended to gamma ray bursts. We have counted the radio and X-ray luminosity data of 47 gamma ray bursts. It is found that there is a similar relationship between the radio luminosity and the X-ray luminosity of the gamma ray bursts obtained by fitting, which indicates that the celestial bodies of different scales are likely to have the same radiation mechanism. The first two work mainly involves the statistics and fitting of the afterglow data of gamma ray bursts, while my third work is the statistics of the host galaxies of gamma ray bursts. And we've created a "big statistical table" of gamma-ray bursts and their host galaxies, and I'm mainly responsible for counting the shape of the host galaxy of the gamma-ray storm, the metal abundance, the absolute magnitude AB magnitude, the hydrogen column density, the extinction rate, the star formation rate. Eight statistical histograms of host galaxy data are obtained, which are listed in Chapter 5. Finally, the main contents of this paper are summarized, and the problems to be solved in the field of gamma-ray bursts and their host galaxies are prospected.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P172.3
【参考文献】
相关期刊论文 前3条
1 徐明;黄永锋;;伽玛射线暴及其余辉研究进展[J];天文学进展;2012年01期
2 ;Optical Flash of GRB 990123: Constraints on the Physical Parameters of the Reverse Shock[J];Chinese Journal of Astronomy and Astrophysics;2002年05期
3 王祥玉,戴子高,陆W，
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