發(fā)布時(shí)間：2018-01-19 16:09

  本文關(guān)鍵詞： 吸積盤 黑洞 熱吸積流 輻射機(jī)制　出處：《華中科技大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：黑洞吸積作為宇宙中的主要的能源機(jī)制，它對(duì)于解釋一些重要的觀測(cè)現(xiàn)象，以及理解其它的物理過程非常有幫助。眾所周知，根據(jù)吸積流溫度的不同，可以將吸積盤模型被劃分為“冷盤”和“熱盤”兩大類。熱盤的主要代表是徑移主導(dǎo)的吸積流模型（ADAF），本文主要探討熱吸積流的幾個(gè)相關(guān)問題。 第一章是黑洞吸積概述部分，主要講述了黑洞物理簡(jiǎn)介和吸積盤的基本理論。關(guān)于黑洞物理簡(jiǎn)介，我們從黑洞的發(fā)展歷程開始講起。接著講述了黑洞所處的宇宙環(huán)境——活動(dòng)星系核（AGN）、低光度活動(dòng)星系核（LLAGN）、黑洞X射線雙星，其中對(duì)活動(dòng)星系核（AGN）用了大量的篇幅去介紹。最后，根據(jù)黑洞質(zhì)量將其劃分為四種類型，主要包括超大質(zhì)量黑洞，原初黑洞，恒星級(jí)黑洞，還有中等質(zhì)量黑洞。關(guān)于吸積盤的基本理論，包括吸積盤的發(fā)展歷程和吸積盤的主要分類兩部分內(nèi)容。對(duì)于吸積盤的主要分類，首先給出描述黑洞吸積盤的流體力學(xué)方程組，然后對(duì)ADAF，Slim盤，標(biāo)準(zhǔn)薄盤（SSD），以及SLE盤等四個(gè)典型的吸積盤模型進(jìn)行簡(jiǎn)單介紹。 第二章是熱吸積流模型淺析，本章先簡(jiǎn)單介紹了徑移主導(dǎo)吸積流（ADAF）和明亮熱吸積流（LHAF）兩種已有的模型。我們知道LHAF是ADAF在高光度情況下的自然延伸，，雖然描述ADAF和LHAF的基本方程是一樣的，但是二者在物理上還是有所區(qū)別。基于以上描述，我們對(duì)熱吸積流模型做了淺析。通過引入數(shù)學(xué)分析的方法嘗試重新解釋LHAF的定義，同時(shí)對(duì)高于ADAF臨界吸積率的吸積流做了初步的探討。最后給出了LHAF的不穩(wěn)定性問題的簡(jiǎn)單解釋。 第三章是帶輻射的熱吸積流相關(guān)問題，首先我們利用前人數(shù)值模擬的結(jié)果，分析導(dǎo)致這些結(jié)果的原因，重點(diǎn)比較了ADAF與LHAF的不同。前人對(duì)于熱吸積流的某些物理量只給出了結(jié)果，卻沒有道出導(dǎo)致這個(gè)結(jié)果的原因，我們?cè)谶@里嘗試給出解釋；進(jìn)一步的討論了ADAF模型中的外流和貝努力參數(shù)，探討二者是否存在著某種關(guān)系，并給出了導(dǎo)致貝努力參數(shù)變化的原因；最后我們還簡(jiǎn)單討論了熱盤內(nèi)區(qū)的逆康普頓散射問題。最后，第四章我們對(duì)論文進(jìn)行總結(jié)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.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：P145.8

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本文編號(hào)：1444887