活动星系核X射线本征谱指数和爱丁顿比之间的关系

发布时间：2018-01-22 02:56

本文关键词： 活动星系核 X射线光谱多波段观测多波段能谱拟合吸积物理　出处：《中国科学技术大学》2016年硕士论文　论文类型：学位论文

【摘要】：本文选取了一个在ECDFS和CDFN天区中的比较亮的活动星系核(AGN)样本,对这一样本做了比较详细的X射线光谱分析,得到了这个样本的X射线特性,如本征谱指数、中性氢柱密度、X-ray本征光度等等。得到这个样本的谱指数的平均值为Γ= 1.72±0.01,同时也得到了一些X-ray物理参数之间的关系,并和前人的工作进行了比较。找到这些源的多波段数据,对多波段的测光数据进行卡方最小化方法的二成分能谱分析,分解出星系的贡献和活动星系核的贡献,可以得到星系和活动星系核的一些物理参数,如星系质量、星系年龄、活动星系核的光学光度等。对于这两个天区,有些源已经有比较精确的黑洞质量的测量,可以和得到的星系质量进行比较,发现中央超大质量黑洞的质量和星系质量之间的关系和近邻宇宙中得到的关系类似,并没有一个明显的演化关系。利用之前得到的数据,构造一个比之前工作(Gu,et al.,2009)更大、X射线拟合方法也更统一的活动星系核样本研究谱指数和爱丁顿比之间的关系,发现对于那些低光度的活动星系核(通常吸积率也比较低)两者确实是一个很明显的反相关关系,对于亮一些的活动星系核(吸积率相对高一些)两者满足一个不是特别明显的正相关关系,我们认为在吸积率变大地过程中,吸积模式发生了转变。这两种关系也在前人的很多工作中被发现,但我们的工作使这一关系推到更高的红移上,比例系数不同的原因也会在本文中结合吸积理论模型进行进一步的讨论。
[Abstract]:In this paper, a brighter AGNN sample of active galactic nuclei in the ECDFS and CDFN sky regions is selected and the X-ray spectra of this sample are analyzed in detail. The X-ray characteristics of this sample are obtained, such as intrinsic spectral index, neutral hydrogen column density and X-ray intrinsic luminosity, etc. The average value of spectral index of this sample is 螕 = 1.72 卤0.01. At the same time, the relationship between some X-ray physical parameters is obtained, and compared with the previous work, the multi-band data of these sources are found. Based on the two-component energy spectrum analysis of the chi-square minimization method, the contribution of galaxies and active galactic nuclei can be decomposed, and some physical parameters of galaxies and active galactic nuclei can be obtained. For example, the mass of galaxies, the age of galaxies, the optical luminosity of active galactic nuclei, and so on. For these two regions, some sources already have more accurate measurements of the mass of black holes, which can be compared with the resulting masses of galaxies. It is found that the relationship between the mass of a central supermassive black hole and the mass of a galaxy is similar to that obtained in a nearby universe, and there is no obvious evolutionary relationship. The relationship between spectral index and Eddington ratio of AGNs is more uniform and larger than that of previous work (Guet al.2009). It is found that there is a clear inverse correlation between the two for those low luminosity active galactic nuclei (which are usually also relatively low accretion). For brighter active galactic nuclei (the accretion rate is relatively high) both satisfy a less obvious positive correlation, we believe that in the process of accretion rate increasing. The accretion model has changed. These two relationships have also been found in many previous work, but our work has pushed the relationship to a higher redshift. The causes of different ratio coefficients will also be further discussed in this paper with accretion theory model.
【学位授予单位】：中国科学技术大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P157.6

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