超新星遗迹的X射线辐射观测研究

发布时间：2018-04-11 23:25

本文选题：超新星遗迹 + Chandra　；参考：《湘潭大学》2013年硕士论文

【摘要】：超新星（supernova，缩写为SN）作为宇宙中最剧烈的天体物理现象之一，，一直是以来都是人们研究的热点。在早期的研究阶段，超新星遗迹的X射线图像观测分辨率很低，使得我们对超新星遗迹的研究存在一些阻碍。自从能量分辨率和空间分辨率都较高的Chandra X射线观测卫星发射升空以后，超新星遗迹的X射线辐射为我们理解恒星的晚期演化，宇宙重元素合成和星际介质以及宇宙线起源提供了很好的观测数据。本文主要利用高空间分辨率、高能量分辨率、和高灵敏度的Chandra X射线卫星观测数据，研究超新星遗迹的高温热气体辐射性质。本论文的第一部分工作利用Chandra卫星观测数据，对G292.0+1.8超新星遗迹进行高空间分辨的能谱分析。通过分区域产生能谱并拟合得到遗迹中各物理参量，如温度、元素丰度、电离年龄、辐射量等等。我们发现O、Ne和Mg元素丰度之间都存在很好的相关性，表明它们都来自同一核合成过程。Si和S元素丰度之间也有较好的相关性。Fe元素与其它元素都不存在很好的相关性。通过观测得到的元素丰度比与理论计算进行比较，得到G292.0+1.8的前身星质量为25-30M⊙。第二部分工作是利用Chandra卫星观测数据，对超新星遗迹Tycho进行高空间分辨的能谱分析。我们按第一个工作的计算方式得到了遗迹中各物理参量，例如温度、元素丰度、电离年龄、辐射量等空间分布。我们发现Si和S元素丰度之间也有很好的相关性，表示它们都来自同一核合成过程。Fe和Si元素丰度之间也有一定的正相关。
[Abstract]:Supernova (SNN), as one of the most intense astrophysical phenomena in the universe, has always been a hot research topic.In the early stage of research, the resolution of X-ray images of supernova remains is very low, which makes the study of supernova remains difficult.Since the launch of the Chandra X-ray observation satellite with high energy and spatial resolution, the X-ray radiation from the supernova remains has given us an understanding of the late evolution of stars.Cosmic heavy element synthesis and interstellar media as well as cosmic ray origin provide good observational data.In this paper, the high temperature thermal gas radiation properties of supernova relic are studied by using Chandra X-ray satellite data with high spatial resolution, high energy resolution and high sensitivity.In the first part of this paper, the high spatial resolution energy spectrum analysis of G292.0 1.8 supernova remains is carried out using the Chandra satellite observation data.The energy spectra are generated from different regions and the physical parameters such as temperature, element abundance, ionization age, radiation amount and so on are obtained.It is found that there is a good correlation between the abundance of ONe and mg, which indicates that they all come from the same nuclear synthesis process. There is also a good correlation between the abundance of 0.Si and the element of S. There is no good correlation between Fe and other elements.By comparing the observed element abundance ratio with the theoretical calculation, it is obtained that the precursor mass of G292.0 1.8 is 25-30M _ (298).In the second part, the high spatial resolution energy spectrum of supernova remnant Tycho is analyzed by using Chandra satellite observation data.The spatial distribution of physical parameters, such as temperature, element abundance, ionization age, radiation and so on, has been obtained according to the calculation method of the first work.We also find that there is also a good correlation between the abundance of Si and S, indicating that they all come from the same nuclear synthesis process. There is also a positive correlation between the abundance of Si and Fe.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P145.3

【参考文献】