伽玛暴寄主星系性质的统计分析

发布时间：2018-05-30 14:59

本文选题：伽玛暴 + 寄主星系　；参考：《广西大学》2013年硕士论文

【摘要】：本论文简要概述伽玛射线暴(简称伽玛暴)及其余辉的观测特征和理论模型,并介绍伽玛暴寄主星系的研究现状以及伽玛暴寄主星系的物理特征,随后重点介绍我们对伽玛暴寄主星系性质的统计分布和相关性研究,并探讨这些性质的宇宙学演化。伽玛暴及其余辉都为研究伽玛暴前身星和寄主星系提供了重要的信息。主流认为长暴起源于大质量恒星的塌缩,短暴起源于双致密星的合并,对伽玛暴寄主星系的观测也支持这种看法。长暴寄主星系一般是较暗的、偏蓝、低质量、低金属丰度的恒星形成星系,短暴寄主星系类型比较复杂,但主要也是恒星形成星系。目前已有将近200个伽玛暴寄主星系被观测到。从光学到近红外波段都能够得到它们的光度测量研究以及它们的辐射线流量,而且光度和辐射线流量都来自恒星形成区。我们系统研究了长暴寄主星系的统计性质,发现(1)寄主星系金属丰度和星系恒星质量之间存在着明显的相关性,说明寄主星系的总体质量对寄主星系化学演化起着重要的作用；(2)SSFR (Specific Star Forming Rate)与恒星质量是反相关关系,表明星系的恒星形成活动随着它的恒星总质量的增加而受到抑制,星系间引力潮汐和并合作用是会影响到星系的恒星形成活动；(3)恒星形成率与恒星质量存在一定的正相关性,与一般星系的研究结果相-致,证明伽玛暴寄主星系不是特殊的星系；(4)寄主星系消光与恒星质量之间的相关性非常弱,说明对消光的影响主要还是取决于周围的环境,与伽玛暴寄主星系内禀性质(恒星质量)关系不大；(5)伽玛暴寄主星系消光和X射线氢柱密度没有任何很强的相关性。关于宇宙学演化问题,我们将伽玛暴寄主星系的恒星形成率(SFR)、恒星质量、金属丰度和星系消光等性质与相应的红移比较,发现SFR随红移的增加而增大,而远寄主星系(1z6.3)比近寄主星系(0.007z1)具有较高的平均恒星质量,并且金属丰度不随红移演化,消光也不存在宇宙学演化,反映出消光与星系距离无关。
[Abstract]:In this paper, the observational characteristics and theoretical models of Gamma-ray bursts (GRBs) and their afterglow are briefly summarized, and the present research situation of GRB host galaxies and the physical characteristics of GRBs host galaxies are also introduced. Then we focus on the statistical distribution and correlation of the properties of GRB host galaxies and discuss the cosmological evolution of these properties. Both gamma storms and their afterglow provide important information for the study of gamma storm precursors and host galaxies. It is believed that long bursts originated from the collapse of massive stars and short bursts from the combination of double dense stars. Observations of gamma storm host galaxies also support this view. Long burst host galaxies are usually dark, blue, low mass, low metal abundance star forming galaxies, short storm host galaxies are more complex, but mainly star forming galaxies. Nearly 200 gamma storm host galaxies have been observed. Their photometric measurements and their radiation line flow can be obtained from optical to near infrared bands, and the luminosity and radiation line flow come from the star forming region. We have systematically studied the statistical properties of long burst host galaxies and found that there is an obvious correlation between the metal abundance of host galaxies and the stellar mass of galaxies. It is suggested that the total mass of host galaxies plays an important role in the chemical evolution of host galaxies. The relationship between SSFR-specific Star Forming Rate) and star mass is inversely correlated, indicating that the star formation activity of galaxies is suppressed with the increase of total stellar mass. Intergalactic gravitational tides and convergence are positive correlations between star formation rate and star mass, which may affect star formation activity in galaxies, and are related to the results of studies on general galaxies. The correlation between extinction of host galaxies and stellar mass is very weak, which indicates that the influence of extinction mainly depends on the surrounding environment. There is no strong correlation between the extinction of gamma storm host galaxies and the density of X-ray hydrogen column. With regard to cosmological evolution, we compare the properties of star formation rate (SFR), star mass, metal abundance and galactic extinction of gamma storm host galaxies with the corresponding redshift. It is found that the SFR increases with the increase of redshift. The distant host galaxy (1z6.3) has a higher average stellar mass than the near-host galaxy (0.007z1), and the metal abundance does not evolve with redshift, nor does extinction have a cosmological evolution, indicating that extinction is independent of the distance between the galaxies.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P172.3

【共引文献】