邻近晚型面向星系中的热气体

发布时间：2018-02-11 17:37

本文关键词： 南京大学学位论文 LATEX模板　出处：《南京大学》2012年硕士论文　论文类型：学位论文

【摘要】：在爱因斯坦卫星和伦琴卫星时代,在对许多邻近星系的观测中,我们已经发现了辐射软x射线的热气体。最近借助于21世纪末发射的新一代x射线望远镜的强大观测能力,我们可以很好地分辨出邻近星系中的许多亮点源,例如恒星级X射电源和活动星系核。通过移除这些星系中的亮点源,去除它们对其他弥漫辐射X射线源的影响,邻近星系中弥漫X射线辐射的性质和物理本质可以得到更好地研究,特别是我们关注的热气体的性质。在这篇论文中,我将介绍我本人在硕士研究生期间所作对多个单独星系中热气体的工作。论文结构如下：第一章简略介绍与邻近星系中热气体的研究相关的一些基本科学问题,然后再介绍不同类型的星系中关于热气体的一些普遍接受的知识。第二章主要介绍我对于邻近晚型面向星系的一些工作,这些工作主要集中研究星系热气体的性质。我们对于活动性一般的晚型面向漩涡星系NGC628(第2.2节)的研究中,我们关注去除亮X射线点源后,剩余的弥漫x射线辐射的空间分布性质和光谱性质。我们发现其弥漫X射线辐射主要分布于星系盘上的旋臂区域,显著的不同于那些中心星暴星系。这些弥漫X射线辐射的结构与旋臂上的恒星形成区有很好的空间相关性,不过其范围比光学波段星系旋臂结构要延伸更远。我们发现了星系中弥漫X射线流量与中红外辐射流量有着很好的正相关关系。另外我们在这个星系中发现其中的弥漫X射线辐射可以很好地用一个温度为0.2keV的热等离子体成分加上一个幂律谱成分的模型拟合。而在我们对星暴星系NGC5236(第2.3节)的研究中,我们发现虽然其星暴核心会产生更高密度的弥漫x射线辐射,但是旋臂上的弥漫x射线光度依然占据了星系整体弥漫x射线辐射光度的大部分。和NGC628类似的是,NGC5236星系外区盘面上的弥漫X射线辐射也很好地沿着光学和Hα波段的旋臂分布。不同于NGC628的是,NGC5236整个星系的光谱可以用双温度(0.25keV和0.6keV)的热等离子体成分加上幂律谱成分拟合。我们认为其中高温的等离子体成分可能是来自于星暴区域更强烈的恒星形成活动。第三章主要中,基于前人和我们自己的研究,我将总结对于邻近星系中的热气体的一些重要的研究成果(第3.1节)的总结,和对于接下来工作内容的期望(第3.2节)。
[Abstract]:In the Einstein satellite and satellite observations in the roentgen era, many nearby galaxies, we have found the hot gas radiation soft X ray. Recently with the help of powerful observation capability of a new generation of X ray telescope at the end of the twenty-first Century launch, we can well distinguish the source of many bright spots in a nearby galaxy, such as stars X radio sources and AGNs. Through the source spot in these galaxies is removed, remove their influence on other diffuse radiation X ray source, nearby galaxy diffuse X ray radiation and the physical essence can get better research, especially the properties of the hot gas of our attention.
In this paper, I will introduce my own work on hot gases in multiple separate galaxies during my master's degree. The structure of this paper is as follows:
The first chapter briefly introduces some basic scientific problems related to the research of hot gases in nearby galaxies, and then introduces some widely accepted knowledge about hot gases in different types of galaxies.
The second chapter mainly introduces some of my work for the galaxy to nearby late type, the nature of these work mainly focus on the galaxy of hot gas. We face late type spiral galaxy NGC628 for general activity (Section 2.2) study, we focus on the removal of X light ray point sources, the remaining x diffuse radiation the spatial distribution characteristics and spectral properties. We found that the spiral arm regions diffuse X ray radiation is mainly distributed in the Galactic disc, significantly different from those of central starburst galaxies. These diffuse X ray radiation structure and the arm of the star forming region has good spatial correlation, but its scope should be extended farther than the optical the band structure of the galaxy's spiral arms. We found in the galaxy X ray diffuse flow has a positive correlation between good and infrared radiation flow. In addition we found diffuse X ray radiation in the galaxy Ejection can be well fitted with a model of a thermal plasma component with a temperature of 0.2keV plus a power law spectrum.
In our NGC5236 of starburst galaxies (Section 2.3) study, we found that although the starburst core diffuse X ray radiation will produce higher density, but the arms of the diffuse X ray luminosity still occupy the most diffuse whole galaxies X ray radiation luminosity and NGC628. Similarly, the galaxy NGC5236 region on the surface of the diffuse X ray radiation well along the spiral arms and optical H alpha band distribution. It is different from NGC628, with two temperature NGC5236 spectra of the galaxy can (0.25keV and 0.6keV) of the thermal plasma components with power-law spectrum fitting. We believe that the high temperature plasma composition may be from in the starburst region more intense star formation activity.
The third chapter is mainly based on previous studies and our own research. I will summarize some important research achievements of the hot gas in the nearby galaxies (Section 3.1) and the expectation for the next work (Section 3.2).

【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：P152

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