本文選題：活動星系核(AGNs) + 光變周期��； 參考：《云南師范大學(xué)》2015年碩士論文

【摘要】：活動星系核(AGNs)是現(xiàn)代天體物理學(xué)中最有價值的研究領(lǐng)域之一。Blazar天體是AGNs的一個部分,其光變性質(zhì)的不同,反映了它的性質(zhì)、結(jié)構(gòu)以及內(nèi)部物理過程的不同。所以,研究Blazar天體的光變可以幫助我們更多地去了解活動星系核的物理本質(zhì)特征,能夠得到關(guān)于這類天體活動機(jī)制的有用信息,這對研究AGNs模型有著重要的意義。在本文當(dāng)中,首先介紹了活動星系核的相關(guān)知識;其次,介紹了Blazar天體的光變以及光變的分類,光變可分為短時標(biāo)光變、中時標(biāo)光變和長周期光變?nèi)?本文主要研究的是Blazar天體的長周期光變和光變周期的計(jì)算。第三章,介紹了分析Blazar天體光變周期的幾種方法。目前比較成熟的方法有:Jurkevich方法、小波分析方法、結(jié)構(gòu)函數(shù)法、功率譜法、離散相關(guān)函數(shù)分析方法等;在第四章中,先簡單提了一下應(yīng)用到信號分析當(dāng)中的傅立葉變換分析方法,包括連續(xù)傅立葉變換和離散傅立葉變換。下面將介紹周期分析的另外一種方法,就是Period04分析方法,它是目前天文界尤其是脈動變星研究中最常用的分析軟件之一。在介紹的過程中,描述了譜分析軟件Period04的界面和功能,以及用它進(jìn)行周期分析的步驟。最后,在第五章中研究了Period04方法在活動星系核光變周期中的實(shí)際應(yīng)用。搜集了類星體3C 273和BL Lac天體OJ 287的長期光變觀測數(shù)據(jù),在此基礎(chǔ)上用Period04軟件對觀測數(shù)據(jù)進(jìn)行周期分析,并獲得可信度較高的周期結(jié)果,得出的周期跟其他作者用不同方法得出的結(jié)果基本一致。然后用算出的周期再次擬合觀測數(shù)據(jù)做一個周期反演,周期擬合曲線與觀測數(shù)據(jù)的爆發(fā)周期規(guī)律基本一致,說明得出的周期是比較可靠的。通過得出的周期可以估算其中心黑洞質(zhì)量和不穩(wěn)定性發(fā)生區(qū)域的半徑。結(jié)果表明:將Period04方法應(yīng)用到Blazar天體的周期分析研究上是比較可靠的。
[Abstract]:Active Galactic Nucleus (AGNs) is one of the most valuable research fields in modern astrophysics. Blazar is a part of AGNs. The difference of its photonic properties reflects the difference of its properties, structures and internal physical processes. Therefore, the study of the light variation of Blazar celestial bodies can help us to understand the physical characteristics of AGNs and obtain useful information about the active mechanism of AGNs, which is of great significance to the study of the AGNs model. In this paper, we first introduce the relevant knowledge of the active galactic nucleus, secondly, we introduce the light variation and the classification of the Blazar celestial body, which can be divided into three types: short time scale light change, medium time scale light change and long period light change. In this paper, we mainly study the calculation of long period light variation and optical variation period of Blazar celestial body. In the third chapter, several methods of analyzing the period of Blazar celestial body are introduced. At present, there are more mature methods such as: Jurkevich method, wavelet analysis method, structure function method, power spectrum method, discrete correlation function analysis method, etc. In the fourth chapter, the Fourier transform analysis method which is applied to signal analysis is briefly mentioned. It includes continuous Fourier transform and discrete Fourier transform. Another method for periodic analysis is the Period04 method, which is one of the most commonly used analytical software in astronomical research, especially in the study of pulsating variable stars. In the course of introduction, the interface and function of spectrum analysis software Period04 are described, and the steps of using it to carry out periodic analysis are described. Finally, in Chapter 5, the practical application of the Period04 method in the period of light variation of AGNs is studied. The long-term photovariation data of the quasars 3C 273 and BL Lac object OJ287 are collected. On the basis of these data, the periodic analysis of the observed data is carried out by using Period04 software, and the reliable periodic results are obtained. The resulting cycle is basically consistent with the results obtained by other authors in different ways. Then a periodic inversion is made by using the calculated period to fit the observed data again. The periodic fitting curve is basically consistent with the law of the burst cycle of the observed data, which shows that the obtained period is relatively reliable. The mass of the central black hole and the radius of the region of instability can be estimated by the period obtained. The results show that it is reliable to apply the Period04 method to the periodic analysis of Blazar objects.
【學(xué)位授予單位】：云南師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P157.7

【共引文獻(xiàn)】

相關(guān)期刊論文 前3條

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本文編號：1937717