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AGN的多波段性质与演化研究
Alternative TitleResearch on Characteristic of multi-band Spectral Energy Distribution and Evolution of AGN
戴宏
Subtype博士
Thesis Advisor谢光中
2006-07-26
Degree Grantor中国科学院研究生院(云南天文台)
Place of Conferral北京
Degree Discipline天体物理
Keyword活动星系核   多波段能谱   光变   宽发射线光度   演化
Abstract本文对活动星系核(AGN)的基本性质、多波段辐射的观测结果和理论研究现状等作了较为全面的评述,指出了一些尚待探讨的问题。对其中与AGN的多波段能谱特性和演化有关的部分具体问题进行了研究并得到了一些新的结果。 (1)引入复合谱指数 对blazar子类的多波段连续谱进行了研究,发现了X射线选BL Lac 天体(XBL),射电选BL Lac 天体(RBL)和平谱射电类星体(FSRQ)之间的关系,即RBL是FSRQ和XBL之间的过渡天体。同时,还对XBL、RBL和FSRQ在双色图( )上位于一个连续序列的分析结果提出了可能的理论解释。 (2)通过收集样本,对blazar天体的内禀热光度与参数Δ(Δ与吸积率 及核的气体密度强相关)的相关性及双色图(U-B~B-V图)进行了研究,结果均表明,FSRQ出现于blazar演化序列的较早的激烈阶段,而BL Lac天体则出现于演化的较晚阶段,即椭圆星系的演化可能是从FSRQ到BL Lac天体。 (3)对具有宽发射线光度的一个射电噪AGN样本进行了发射线光度与内禀爱丁顿吸积率的相关性分析,其结果不仅从实验上验证了Czerny, Rozanska & Kuraszkiewicz(2004)居于径移主导吸积流(ADAF)模型提出的理论,支持统一模型,而且得到了椭圆星系的演化序列可能是从FSRQ到BL Lac天体和FRI & FRII射电星系的一个新证据。同时,还利用双色图(U-B~B-V图)研究了包括FSRQ、BL Lac天体、射电星系在内的射电噪AGN的演化图景,这也得到了椭圆星系是从FSRQ→BL Lac天体→射电星系进行演化的推论。这些结果与Punsly(1996)的理论预言是一致的。
Other AbstractIn this thesis, the basic properties, the observation of multi-band radiation and the relevant theories for AGN have been reviewed. Some problems to be discussed have been pointed out, among which a few of specific ones, related to the variability timescale, the central structure, the some characteristics for multi-band spectral energy distribution and evolution of AGN, have been investigated and are summarized as follows. (1)Using a new composite color-color ( - ) diagram, where is a new composite spectral indies which was introduced by us and by Sambura et al.(1996), we investigated the nature of the HBLs-LBLs relationship, and the BL Lacs-FSRQs relationship, in high-energy emission. The results show that the optical¬—X-ray—γ-ray spectral energy distributions of three subclasses of GeV γ-ray loud blazers are different, but essentially continuous:HBLs and FSRQs occupy separated regions while LBLs bridge the gap between HBLs and FSRQs. And the possible interpretation has been proposed to the results. (2)Based on the 42 samples and 77 samples, evolutionary sequence of the blazars has been studied with the correlations in intrinsic bolometric luminosity and parameter Δ (Punsly 1996) and the color-color (U-B vs. B-V) diagram which is originally for the stellar evolutionary sequence, respectively. The results show that the evolutionary track of blazers is from FSRQs to BL Lac objects, that is, all FSRQs and BL Lac objects are considered to be in the same family. But FSRQs have high luminosity and larger accretion rates, that is, FSRQs occur in the earlier, violent phase of the blazar evolutionary sequence, while BL Lac objects have low luminosity and smaller accretion rates, that is, they occur in the later phase of the galactic evolutionary sequence. (3)Based on a sample of 16 flat spectra radio quasars, 8 BL Lac objects and 15 FRI and FRII radio galaxies, for which the broad-line luminosities are available, the correlation between the the broad-line luminosity and the intrinsic Eddington ratio is shown for FSRQs, BL Lac objects and FRI & FRII radio galaxies. This result not only provide a solid experimental basis of the theory of Czerny, Rozanska & Kuraszkiewicz(2004)which is described by ADAF principle, but also give a new evidence for that the evolutionary sequence of the elliptical galaxies is from FSRQs to BL Lac objects and FRI & FRII radio galaxies. Then, we also study the evolutionary scheme of radio-loud AGNs with the color-color (U-B vs. B-V) diagram by a sample of 31 FSRQs, 46 BL Lac objects and 22 FR radio galaxies. We find that the evolutionary track of blazars is from FSRQs to BL Lac objects and FRI & FRII(G) radio galaxies. The results found by us are consistent with the speculation of Punsly(1996).
Subject Area天文学
Pages127
Language中文
Document Type学位论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/7162
Collection星系研究组
Recommended Citation
GB/T 7714
戴宏. AGN的多波段性质与演化研究[D]. 北京. 中国科学院研究生院(云南天文台),2006.
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