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耀变体的喷流辐射研究
其他题名The Jet Emission in Blazars
杜雷鸣
学位类型博士
导师白金明
2012-05-25
学位授予单位中国科学院研究生院(云南天文台)
学位授予地点北京
学位专业天体物理
关键词耀变体 多波段辐射 辐射机制 聚束效应 黑洞基本平面
摘要本文主要研究目标是耀变体的喷流辐射特性。为此采取的研究途径有二:一是通过多波段辐射特性的研究来获得对于喷流辐射机制的深入认识;二是通过喷流和活动星系核(AGN)其它部分(黑洞和吸积盘)之间的联系来获得对于喷流物理的深入认识。在途径一中研究了两个具体的问题,分别对应耀变体能谱分布中的高能和低能两个成分。问题一是利用Fermi的观测数据,使用3种不同的方法表明,外康普顿机制是耀变体高能辐射的主导机制。3种方法中,第1种是沿用已有的法;第2种是对一个已有方法的改进;第3种分析则是首次使用。问题二是针对喷流的低能同步辐射的研究。使用来自SDSS的平谱射电类星体(FSRQ)数据表明,高吸积率的FSRQ也很好地符合黑洞基本平面表示的关系,从FSRQ得到的光度相关关系可以很好地外推到小质量的X射线双星上去。结合已有的结论,表明黑洞基本平面关系适用于全体耀变体。从而把原来认为只适用于低吸积率黑洞系统的黑洞基本平面适用范围扩大了。另外,由于计算过程中使用了FSRQ的同步峰信息(峰频和峰值光度),这使得我们可以把黑洞基本平面和blazar序列联系起来,得到一个含有同步峰信息和黑洞质量的关系。这个关系似乎比blazar序列的内容要更丰富些,值得继续深入研究。 途径二中主要研究了与喷流的多普勒因子这个重要的物理性质,分成3个问题。问题1是在喷流功率-吸积光度关联研究中,把多普勒增亮的因素考虑进去。我们的结果表明,消除了多普勒增亮的同步峰值光度(作为喷流功率的代表)依然和作为吸积功率代表的宽线区光度显著相关。这一结果表明喷流-吸积盘关联是一个内在的关联。问题2和3则是研究了作为耀变体喷流最基本性质的多普勒因子和黑洞质量及宽线区光度之间关联。结果表明多普勒因子和黑洞质量和宽线区光度之间均存在显著相关。这表明耀变体喷流的速度和黑洞质量及吸积率都密切相关。 通过上两个途径的研究,获得了对于喷流性质的一些新的认识,也确认了一些已有的结果,同时对今后的研究开辟了道路。
其他摘要This dissertation is mainly about the jet emission of blazars. This issue is studied in the following two ways. The first way is to study the properties of the jet emission through multi-band properties. The second way is to study through the jet’s links with other objects of AGN, like the black hole and the accretion disk, or with other jets at different scales, like jets of X-ray binaries or of Galactic radio sources. The first part can be divided into two projects. In the first project, the dominant emission mechanism of the higher energy component of blazar SEDs is discussed in three different ways. The results all favor a model that attributes the emission of the discussed component to Inverse-Compton scattering on photons external to the jet. In the second project the fundamental plane of black hole(FPBH) usually only valid for sub-Eddington systems has been showed to be applied also to Flat Spectrum Radio Quasar(FSRQ), which belong to the sub-Eddington systems, in a SDSS sample. This result might suggest that the FPBH is robust regardless the accretion mode. Furthermore, the optical thin luminosity of each source has been calculated from the synchrotron peak frequency and peak luminosity therefore a link between the FPBH and the blazar sequence has also been found. This provides some interesting results such as the usual anti-correlation between the peak luminosity and the peak frequency, the smaller black hole mass’ correspondence to lower peak luminosity and lower peak frequency sources. This connection might be revealed for the first time. The second part is dealing with one of the most important properties of blazars, the Doppler factor. It can be divided into three projects. In the first project we show that there exists a significant correlation between the jet power indicator (νL )peak Syn;obs and the disk power indicator LBLR even after the Doppler enhancement of the synchrotron emission is removed, and this result suggests a close link between the jet powering process and the disk accreting process. In the second project we report a confirm of the significant correlation between the black hole masses and doppler factors employing a large sample of blazars, which is in agreement with previous results while our sample is the largest by far. In the third project, we show that there exist a significant correlation between δ and LBLR, which supports the idea that the jet powering process is closely linked with the accretion process and provides a new evidence for disk-jet connection.
学科领域天文学
语种中文
文献类型学位论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5565
专题丽江天文观测站(南方基地)
推荐引用方式
GB/T 7714
杜雷鸣. 耀变体的喷流辐射研究[D]. 北京. 中国科学院研究生院(云南天文台),2012.
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