Blazar天体的相对论喷流效应

发布时间：2018-05-05 21:39

本文选题：活动星系核 + Blazar天体　；参考：《广州大学》2012年硕士论文

【摘要】：活动星系核（Active Galactic Nucleus）因为其剧烈的活动现象和极端的物理条件一直受到天文学家们的青睐。Blazar天体是活动星系核的一个子类，它们的主要特征包括大幅度快速光变、高而变化的偏振、致密的射电辐射以及视超光速运动等。而喷流，作为活动星系核的一个结构，承载着巨大能量，又以接近光速运动并且还具有高度的准直性，这一极端的物理条件让天文学家们颇为感兴趣。关于Blazar天体相对论喷流效应，，前人做了大量的工作，都是从束流指标出发。比如1993年Ghisellini讨论辐射等离子体的相对论运动的证据。发现多普勒因子以及其它的一些束流指标，比如膨胀速率、核区与延展区的射电流量之比，都支持在喷流中亮结弹道运动的简单运动学模型。而且还发现超光速的源的平均洛伦兹因子的值和视角与我们试图统一BL Lac天体和射电噪类星体与FRI，FR II射电星系分别相一致。1992年Wills等人文章中讨论了核主导系数与偏振以及红移的关系，并且讨论了高光学偏振度类星体与平谱核主导类星体实际上同一类源。2002年和2003年Fan也都讨论了Blazar的偏振度。2009年Fan发现射电光度与多普勒因子相关。所有这些均反映了Blazar喷流效应。本文不但叙述了Blazar喷流效应而且还研究了谱指数和偏振与核主导系数的关系。全文共分四章，具体内容如下： ⅰ)本文第一章主要概述活动星系核的基本特征、分类及其统一模型。 ⅱ)第二章主要叙述喷流的相关性质、相对论喷流模型以及相对论喷流效应。 ⅲ)第三章，从核主导系数入手，分别分析其与谱指数以及偏振度的关系，并用观测资料予以说明相对论喷流效应。核主导系数R与谱指数αt存在一定的相关性，并且这种相关性可以用双成分相对论喷流模型来解释。另外，偏振度也与核主导系数存在一定的相关性。偏振度随着核主导系数的增大而增大，但到一定程度时偏振度将几乎保持不变。 ⅳ)第四章，对Blazar天体的两个子类（蝎虎天体BL Lac和平谱射电源FSRQ）从发射线、偏振、光度、核主导系数、中央黑洞质量等方面进行比较。平谱射电源FSRQ具有显著的发射线，而BL Lac天体没有或者仅有很弱的发射线；平谱射电源FSRQ比BL Lac天体具有更低偏振和更高的光度；平谱射电源FSRQ比BLLac天体有较小的核主导系数值；平谱射电源FSRQ和BL Lac天体的中央黑洞质量几乎差不多。可以说X射线选BL Lac天体(XBLs)、射电选BL Lac天体(RBLs)和平谱射电源FSRQ存在一种连续特征，其中XBLs与FSRQ的差别比较大，而RBLs居于它们之间。 ⅴ)第五章，总结和展望。
[Abstract]:The active galactic nucleus (Active Galactic Nucleus) has been favored by astronomers for its intense activity and extreme physical conditions. The.Blazar objects are a subclass of the active galactic nuclei. Their main features include large and rapid light changes, high and varied polarization, dense radio radiation, and apparent superlight velocity. The jet, as a structure of the active galactic nucleus, carries huge energy and moves near the speed of light and also has a high degree of collimation. This extreme physical condition is very interesting to astronomers.
A large amount of work has been done on the relativistic jet effect of Blazar celestial bodies, such as the evidence of the relativistic motion of the radiation plasma in 1993, such as the evidence of the relativistic motion of the radiation plasma, such as the Doppler factor and some other beam parameters, such as the rate of expansion, and the ratio of the radio flow between the nuclear and the ductile areas. A simple kinematic model of the ballistic motion of a bright junction in a jet. Furthermore, it is found that the values of the mean Lorenz factor of the source of the superlight velocity and the angle of view are consistent with our attempt to unify the BL Lac celestial bodies and the radio and noise stars and FRI, FR II radio galaxies, respectively, Wills et al.,.1992, respectively, to discuss the relationship between the nuclear dominant coefficient and polarization and the red shift. The high optical polarization quasars and the flat spectral core dominant quasars are discussed in fact the same kind of source.2002 and Fan in 2003. The polarization degree of Blazar is also discussed in.2009 year Fan, and the correlation between the radio luminosity and the Doppler factor is found. All these reflect the Blazar jet effect. This paper not only describes the effect of the jet flow, but also describes the effect of the Blazar jet and also studies the effect of the jet. The relationship between spectral exponents and polarization and nuclear dominant coefficient.
The full text is divided into four chapters, and the specific contents are as follows:
The first chapter outlines the basic characteristics, classification and unified models of active galactic nuclei (AGN).
The second chapter mainly describes the related properties of jet, relativistic jet model and relativistic jet effect.
III) in the third chapter, the relationship between the spectral exponent and the degree of polarization is analyzed from the core dominant factor, and the relativistic jet effect is explained by the observation data. The nuclear dominant coefficient R has a certain correlation with the spectral exponent alpha T, and the correlation can be explained by the dual component relativistic jet model. There is a certain correlation between the conductance coefficient. The degree of polarization increases with the increase of the nuclear dominant coefficient, but to a certain extent, the degree of polarization will remain almost unchanged.
The fourth chapter is to compare the two subclasses of Blazar celestial bodies (the BL Lac peace spectrum source FSRQ) from the launch line, polarization, luminosity, core dominant coefficient, central black hole mass, and so on. The flat spectrum radio source FSRQ has a significant emission line, and the BL Lac celestial body has no or only a very weak emission line; the flat spectrum power source FSRQ is more than BL Lac days. The body has lower polarization and higher luminosity; the flat spectrum power source FSRQ has smaller nuclear dominant values than the BLLac celestial body; the mass of the central black hole of the flat spectrum source FSRQ and the BL Lac celestial body is almost the same. It is possible to say that the X ray selected the BL Lac celestial body (XBLs), the radio selected BL Lac celestial body (RBLs) and the peaceful spectral power source have a continuous feature, among which there is a continuous characteristic. The difference between Ls and FSRQ is large, while RBLs is between them.
The fifth chapter, summary and prospect.

【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：P157.7

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