伽玛暴光度宇宙学演化及多波段余辉数据分析

发布时间：2018-05-31 14:46

  本文选题：伽玛暴 + 宇宙学演化　； 参考：《广西大学》2015年硕士论文

【摘要】：伽玛暴是发生于宇宙学距离、恒星层次和极端高能的伽玛射线爆发现象。随着观测上不断获得进展,特别是Swift卫星升天以来积累了大量有红移测定的伽玛暴本身及其余辉样本,推动其理论研究向前进展。本工作重点研究为利用Swift观测的大样本伽玛暴研究伽暴光度宇宙学演化,同时基于大样本的多波段余辉数据对标准模型进行检验和探究其暴周环境,论文具体组成如下：第一章主要是伽玛暴及其余辉的综述,全面介绍伽玛暴观测进展和理论突破。第二章重点介绍了利用Swift观测的大样本伽玛暴研究伽暴光度的宇宙学演化。目前探测到的伽玛暴最高红移达到9.4,是研究早期宇宙性质的潜在探针。基于最近10年的swift的有红移测定的258个伽玛暴的大样本,我们探究伽玛暴宇宙学演化性质。首先采作用T统计的方法得出伽玛暴的确是宇宙学演化的,其演化方式为L∞(1+Z)0.74±0.09。同时我们也采用蒙特卡罗模拟的方法,基于伽马暴率跟随恒星形成率的假设,得到L∞(1+Z)0.99+0.60-0.45。这两种相互独立的方法得到了相似的结果。我们的研究结果与大质量恒星初始质量函数的演化相符,在一定程度上支持了伽玛暴光度的宇宙学演化缘于大质量恒星初始质量的宇宙学演化。第三章主要是利用光学多波段余辉对标准模型进行检验和探究其暴周环境。王远瞩等人系统性分析X射线余辉发现有少数暴的晚期余辉谱有软化现象,然而相应的光变却没什么不一样,这在外激波模型框架下是很难解释。为了探究光学余辉中否也有可能存谱演化模式,本工作通过收集光学多波段观测的伽玛暴余辉,联合X射线余辉,进行分辨谱分析,从频域角度检验外激波模型。同时我们还尝试用伽玛暴光学余辉谱观测对伽玛暴寄主星系消光性质进行研究。
[Abstract]:Gamma-ray bursts occur in cosmological distances, stellar levels, and extremely high energy gamma-ray bursts. With the continuous progress in observation, especially the accumulation of a large number of red-shift gamma storms and their afterglow samples since the Swift satellite was launched into space, the theoretical research has been advanced. This work focuses on studying the cosmic evolution of galactography using large sample gamma-ray bursts observed by Swift. At the same time, based on the multi-band afterglow data of large samples, the standard model is tested and its surrounding environment is explored. The main contents of this paper are as follows: the first chapter is a review of gamma storms and their afterglow. The second chapter focuses on the cosmological evolution of the Galactogamma-ray study using large sample gamma-ray bursts observed by Swift. The highest redshift of the detected gamma-ray storms is 9.4, which is a potential probe for the study of the properties of the early universe. Based on the large sample of 258 gamma-ray bursts measured by swift in the last 10 years, we investigate the cosmological evolution of gamma-ray storms. First of all, the method of T statistics shows that the gamma-ray burst is really cosmological, and its evolution mode is L _ 鈭，

本文编号：1960162