Blazar的光变观测研究

发布时间：2018-05-28 02:31

本文选题：blazar + CCD测光　；参考：《云南师范大学》2014年硕士论文

【摘要】：活动星系核（Active Galactic Nucleus）是天体物理学的研究前沿。目前，活动星系核（AGNs）研究对解决许多天体物理学中的重大问题起到了不可替代的作用。同时，它也是天体物理学中最具有研究价值的内容，许多有关活动星系核的重要问题始终困扰着天文学家们。在活动星系核中存在着一类很特殊的天体，，我们把它称为Blazar(耀变体)，由于它们所特有的物理性质：大振幅快速光变、高偏振、整个电磁波段的非热连续辐射及致密的射电辐射等,使Blazar名声大噪，对它的研究也成为了热门课题，它们所特有的物理性质对活动星系核（AGNs）理论模型的建立和探索活动星系核中心区域物理特性有重要意义。而光变周期的研究对于研究天体的转动、振动和轨道运动及探索天体的中心黑洞质量和辐射区域有重要意义。活动星系核的观测历史、主要特征及常见分类都在本文中有所介绍，而活动星系核的辐射机制和光变特性是问题的关键，因此本文介绍了CCD测光技术在天体测光方面的应用及理论基础，重点对Blazar的CCD测光进行了阐述，在此基础上提出了利用IRAF软件对Blazar的光学波段观测数据自动处理的方法，很好地解决了CCD测光观测中产生的海量数据如何方便快捷地进行批量处理的困难。对光变周期的分析计算方法有很多，本文主要针对BL Lac天体OJ287的光变周期采用了Jurkevich方法进行分析和研究。Jurkevich方法的准确性由正弦函数周期信号的模拟检验得以验证。假设长周期光变来源与吸积盘有关联，根据薄盘的热不稳定性来分析，从而得到R81.75Rg和R87.85Rg是其不稳定性发生的区域。通过对OJ287的光变周期研究，获得了解决天体的转动、振动和轨道运动等基本问题的初步方法。总之，光变周期的研究是解决天体时变问题的着手点。
[Abstract]:Active Galactic Nucleus is the frontier of astrophysics. At present, the study of AGNs plays an irreplaceable role in solving many important problems in astrophysics. At the same time, it is also the most valuable research content in astrophysics. There is a very special class of objects in the active galactic nucleus, which we call Blazar, because of their unique physical properties: large amplitude fast light change, high polarization. The non-thermal continuous radiation and dense radio radiation in the whole electromagnetic wave region have made Blazar famous, and its research has become a hot topic. Their unique physical properties are of great significance to the establishment of AGNs theoretical model and the exploration of the physical properties of AGNs in AGNs. The study of the period of light variation is of great significance for the study of the rotation, vibration and orbital motion of celestial bodies and for the exploration of the mass and radiation region of the central black hole of celestial bodies. The observational history, main characteristics and common classification of AGNs are introduced in this paper. The radiative mechanism and light variation characteristics of AGNs are the key to the problem. In this paper, the application and theoretical basis of CCD photometry in astrometry are introduced, and the CCD photometry of Blazar is emphasized. On the basis of this, the method of automatic processing of optical band observation data of Blazar using IRAF software is put forward. The difficulty of mass data processing in CCD photometry is well solved. There are many methods to analyze and calculate the period of light variable. In this paper, the Jurkevich method is used to analyze the period of OJ287 of BL Lac celestial body and the accuracy of the method is verified by the simulation of sine function periodic signal. Assuming that the source of long-period light variation is related to the accretion disk, the thermal instability of the thin disk is analyzed, and it is concluded that R81.75Rg and R87.85Rg are the regions where the instability occurs. Based on the study of OJ287's optical variation period, a preliminary method for solving the basic problems of celestial body rotation, vibration and orbital motion is obtained. In a word, the study of optical variation period is the starting point to solve the time-varying problem of celestial bodies.
【学位授予单位】：云南师范大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P157.7

【参考文献】