黑洞热吸积流的相关问题

发布时间：2018-01-19 16:09

本文关键词： 吸积盘黑洞热吸积流辐射机制　出处：《华中科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：黑洞吸积作为宇宙中的主要的能源机制，它对于解释一些重要的观测现象，以及理解其它的物理过程非常有帮助。众所周知，根据吸积流温度的不同，可以将吸积盘模型被划分为“冷盘”和“热盘”两大类。热盘的主要代表是径移主导的吸积流模型（ADAF），本文主要探讨热吸积流的几个相关问题。第一章是黑洞吸积概述部分，主要讲述了黑洞物理简介和吸积盘的基本理论。关于黑洞物理简介，我们从黑洞的发展历程开始讲起。接着讲述了黑洞所处的宇宙环境——活动星系核（AGN）、低光度活动星系核（LLAGN）、黑洞X射线双星，其中对活动星系核（AGN）用了大量的篇幅去介绍。最后，根据黑洞质量将其划分为四种类型，主要包括超大质量黑洞，原初黑洞，恒星级黑洞，还有中等质量黑洞。关于吸积盘的基本理论，包括吸积盘的发展历程和吸积盘的主要分类两部分内容。对于吸积盘的主要分类，首先给出描述黑洞吸积盘的流体力学方程组，然后对ADAF，Slim盘，标准薄盘（SSD），以及SLE盘等四个典型的吸积盘模型进行简单介绍。第二章是热吸积流模型浅析，本章先简单介绍了径移主导吸积流（ADAF）和明亮热吸积流（LHAF）两种已有的模型。我们知道LHAF是ADAF在高光度情况下的自然延伸，，虽然描述ADAF和LHAF的基本方程是一样的，但是二者在物理上还是有所区别。基于以上描述，我们对热吸积流模型做了浅析。通过引入数学分析的方法尝试重新解释LHAF的定义，同时对高于ADAF临界吸积率的吸积流做了初步的探讨。最后给出了LHAF的不稳定性问题的简单解释。第三章是带辐射的热吸积流相关问题，首先我们利用前人数值模拟的结果，分析导致这些结果的原因，重点比较了ADAF与LHAF的不同。前人对于热吸积流的某些物理量只给出了结果，却没有道出导致这个结果的原因，我们在这里尝试给出解释；进一步的讨论了ADAF模型中的外流和贝努力参数，探讨二者是否存在着某种关系，并给出了导致贝努力参数变化的原因；最后我们还简单讨论了热盘内区的逆康普顿散射问题。最后，第四章我们对论文进行总结和展望。
[Abstract]:Black hole accretion, the main energy mechanism in the universe, is useful in explaining some important observational phenomena and in understanding other physical processes. The accretion disk model can be divided into two categories: "cold disk" and "hot disk". The main representative of hot disk is the accretion flow model (ADAF), which is dominated by diameter shift. In this paper, several related problems of heat accretion flow are discussed. The first chapter is an overview of black hole accretion, mainly about black hole physics and the basic theory of accretion disk. We begin with the development of black holes, and then we talk about the cosmic environment in which black holes are located, namely, active galactic nuclei (AGNN), low luminosity active galactic nuclei (LLAGNN), black hole X-rays binary stars. The active galactic nucleus AGNN is introduced in this paper. Finally, it is divided into four types according to the mass of black hole, including supermassive black hole, primary black hole and stellar black hole. There are also medium-mass black holes. The basic theory of accretion disk includes the development of accretion disk and the main classification of accretion disk. Firstly, the hydrodynamic equations describing the accretion disk of black hole are given, and then four typical accretion disk models, such as Adaf-Slim disk, standard thin disk and SLE disk, are briefly introduced. The second chapter is the analysis of thermal accretion flow model. In this chapter, we briefly introduce the two existing models of path shift dominant accretion flow (ADAF) and bright thermal accretion flow (LHAF). We know that LHAF is a natural extension of ADAF in high luminosity. Although the basic equations describing ADAF and LHAF are the same, they are physically different. Based on the above description. We analyze the thermal accretion flow model and try to reinterpret the definition of LHAF by introducing the mathematical analysis method. At the same time, the accretion flow above the critical accretion rate of ADAF is preliminarily discussed. Finally, a simple explanation of the instability of LHAF is given. The third chapter is the thermal accretion flow with radiation related problems. First, we use the results of previous numerical simulation to analyze the causes of these results. The difference between ADAF and LHAF is emphatically compared. Some physical quantities of thermal accretion flow have only been given results, but the reasons leading to these results have not been indicated. We try to explain them here. The outflow and effort parameters of ADAF model are discussed, and the relationship between them is discussed, and the reasons for the change of the parameters are given. Finally, we briefly discuss the inverse Compton scattering problem in the thermal disk region. Finally, in Chapter 4th, we summarize and prospect the paper.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P145.8

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