γ噪Blazar天体的特性研究

【作者】 毛慰明；

【导师】 伍林； 张雄；

【作者基本信息】 云南师范大学 ， 天体物理， 2006， 硕士

【摘要】 活动星系核(Active Galactic Nucleus)是现代天体物理学研究的重大前沿课题，涉及到天体物理学中最基本的问题。活动星系核的研究在能量产生、辐射机制和宇宙论等基本问题的研究中占有重要的地位。在活动星系核中，Blazar天体是具有极端性质的一类，它以大幅快速光变、高且变化的偏振、射电核主导、视超光速运动、全波段非热辐射为主要特征。正因为如此，国际上越来越多的力量投入到这一领域的理论和观测研究中。 本文概述了活动星系核的定义，特征和分类，并介绍了活动星系核的统一模型。特别是对Blazar天体的研究现状，Blazar天体的多波段观测与多波段能谱特性研究进行了较为详细的评述。本文还系统地阐述了Blazar天体的观测特征及其辐射机制和理论模型。并利用收集到的66个γ噪Blazar天体(其中包括19个BL Lac天体和47个平谱射电类星体)的基本观测数据和这些源的多波段观测数据，研究了红移以及各波段流量密度的分布。本文还对这66个γ噪Blazar天体各波段流量密度(射电波段、近红外波段、光学波段、X射线波段和γ射线波段)和红移的相关性以及在高态和低态时不同波段流量密度之间可能存在的相互关系进行了研究。更多还原

【Abstract】 Active Galactic Nucleus (AGNs) have been an important branch and one of the most active frontiers in the field of modern astrophysics. It is related to the most fundamental problems in astrophysics .The study of AGNs play an important role in the study of the origin of energy, radiation mechanism and cosmology. Blazars are one of the most extreme classes of active galactic nucleus, with high luminosity, large amplitude and rapid variability, high and variable polarization, radio core-dominance, and apparent superluminal speeds. Their broad band emission extends from radio up to γ-ray band, and is dominated by non-thermal process. Therefore, many people devote themselves to the theoretical and observational studies in this field.In the thesis, we summarize the defined character and classification of active galaxies nucleus (AGNs), present unified schemes of AGNs. Especially, we focus on the multiwavebands observations, the properties of multiwavebands spectral energy distributions (SEDs), the radiation mechanism and the theoretical radiation model of Blazar .Using collected 66 gamma-ray-loud blazars from the most recent EGRET data base (19 BL Lac objects and 47 flat-spectrum radio quasars (FSRQs)) with observed data in multiwavebands, we investigate the distribution of redshift and flux densities for different wavebands. Finally, we studied the possible correlations of flux densities for different (radio, near-infrared, optical, X -ray and gamma-ray) wavebands in low and high state.更多还原