活动星系核的统一模式

本文评述活动星系统的统一模式理论研究。这一研究的基础是活动星系核的相对论性射束效应和它周围各向异生气体的遮蔽效应，我们首选叙述几种统一模式，并阐述其发展。然后讨论检验统一模式的统计检验进展，特别是Ｒ参数的作用，本文还评述了多波段（特别是光学和红外）的统一模式统计检验问题。     

活动星系致密核视角大小的统计研究

本对ＶＬＢＩ观测得到的河外射电源致密核ｃｏｒｅ的视角大小进行了统计研究，发现对单个源平均上视角大小近似反比于观测频率，与目前的模型相一致。在５ＧＨｚ上，在红移范围０．０４＜ｚ＜２．５内，平均的ｃｏｒｅ视角大小近似为常数，在非均匀喷流模型框架下，一种可能的解释是在河外射电源致密结构中磁场存在着演化。     

活动星系致密核视角大小的统计研究

本文对ＶＬＢＩ观测得到的河外射电源致密核ｃｏｒｅ的视角大小进行了统计研究，发现对单个源平均上视角大小近似反比于观测频率，与目前的模型相一致。在５ＧＨｚ上，在红移范围０．０４＜ｚ＜２．５内，平均的ｃｏｒｅ视角大小近似为常数，在非均匀喷流模型框架下，一种可能的解释是在河外射电源致密结构中磁场存在着演化。     

视超光速运动的一个统计检验

本文利用文川提供的视超光速运动数据，对标准宇宙模型、相对论束模型及同步加速自康普顿散射机制在视超光速运动计算方面是否相容的问题进行统计检验．结果表明，理论预言与实际数据相吻合，上述诸理论是相容的，并且它们对视超光速运动的综合解释是合理的．     

上海天文台活动星系核研究

简要介绍了上海天文台活动星系核研究小组近几年来利用国际VIBI网进行活动星系核的VLBI观测情况以及在活动星系核研究方面所取得的主要进展。     

对相对论束模型的一种分类及相应的统计检验方法

本文根据视横向速度是否红移依赖对相对论束模型进行分类并提出对相应模型进行统计检验的方法 .作为应用的例子 ,本文利用前人文献所给视超光速样本进行统计分析 ,并对有关结果进行了讨论     

活动星系致密核的研究

本文对几个大样本ＶＬＢＩ观测的致密核（ｃｏｒｅ） 进行了统计研究,包括核的谱指数, 核的角大小随ＶＬＢＩ观测频率的变化,核角大小与致密喷流角大小的关系以及核角大小随红移的变化,并在非均匀喷流模型下估算了喷流中磁场和相对论性电子密度的分布。     

活动星系核VLBI观测的新进展

介绍了活动星系核 (AGN)的VLBI观测的新近展 ,特别关注其中心结构和低光度的活动星系核。主要目的是强调VLBI观测在该领域的重要性。     

活动星系核黑洞发电机研究进展

类星体被发现后,黑洞发电机研究成为阐述活动星系核（ＡＧＮ）的产能机制及其宇宙学演化的重要内容之一,主要涉及发电机物理和发电机输出特性两个方面,从广义相对论电动力学（ＧＲＥＤ）发电机理论和“膜模式”出发,在太阳发电机研究中引入引力磁项,形成和αωΩ黑洞发电机理论。发电机输出包括吸积盘辐射和喷流传播。辐射模型在于经典吸积模型的相对论扩展,已能说明ＳｇｒＡ＾＊的宽发射谱,燕可能根据谱特征确定发电机的构型     

3C345中视超光速节点运动轨道的数学描述

本文提出一种数学方法来描述类星体３Ｃ３４５中视超光速节点的运动轨道、它既可以描述内部节点的螺旋运动,又可以描述外部节点的直线运动这种统一的描述方法可能对描述其它致密射电源（例如ＰＫＳ０５２８＋１３４）中视超光速节点的运动是有用的。并有助于研究节点流量的内禀变化。     

视超光速运动与加速模型

用相对论加速喷流模型对48个具有视超光速的射电源进行了分析，结果不但支持流行的喷流模型而且说明加速模型是合理的。     

Is the VLBI core of 3C 345 moving?

In the superluminal source quasar 3C 345, five VLBI knots have been observed to have superluminal motion and, in particular, the two knots C₄ and C₅ move along different curved orbits. This paper examines the possibility that this pair of orbits are due to the motion of the radio core. Using the available data, the motions of C₄ and C₅ are resolved as a superposition of a motion of the core and a motion along a common orbit. The results show that such a resolution can fit well the observations. A brief discussion is made on further test of the model and its physical implications.     

One more explanation of superluminal motion

The occurrence of superluminal motion in extragalactic radio sources is believed to be quite common. Among others, the geometrical scattering of radio radiation can also cause superluminal expansion and or motion and halo formation, In this paper, the effectiveness of the stimulated Raman scattering in producing these features is investigated. The scattering medium is a plasma whose position, density and temperature decide the rate and angle of scattering. When the radiation from a stationary and constant source gets scattered from a stationary plasma, a halo is formed around the source. However, the scattering of a rotating radiation beam does produce superluminal motion of the virtual source. It is found that the plasma should have the characteristics of the emission-line regions and the intercloud medium in order to Raman scatter the radiation. Since the scattering is polarization dependent, it is possible to estimate the rotation of the electric vector along the direction of the apparent motion of a radio source.     

估计Be星自转的一个统计方法

本文给出了一个统计方法,可以由观测得到的Be星视自转速度U=V sin i,估计出其真自转速度V;本文证实了Be星不是以临界速度旋转的,其真自转速度和临界速度之比为0.7左右。     

质心运动的视超光速源的运动规律

在源的质心固定的视超光速模型的基础上，进一步出在质心运动情况下的视超光速运动的视速度议程，在喷流方向与源的退行方面相反的情况下，推导核与子源速率相等及核固定条件下子源真实速度的方程，然后代入视速度和由自康顿效应推算的喷流与视线的夹角数据，从而求出上述极值条件下子源的真实速度，再与对应源的哈勃红移速度相对照，结果发现，源的运动对其子源的速度没有影响。     

Faster-than-light motion in quasars

Over the past fifteen years, observations of some quasars with the techniques of very-long-baseline interferometry have shown that the angular separation between pairs of radio-emitting regions in their cores is increasing year after year. If the quasars are indeed as far away as implied by Hubble’s law, then these angular motions translate into linear speeds several times the speed of light. Several theoretical scenarios have been proposed to show that the observed motions are illusory. The leading contender in this field — the relativistic beam model — and an alternative offered by the concept of a gravitational screen are described and compared in the light of recent observational data.     

A relativistic model of the movement of apparent superluminal radio sources

Based on the relativistic model of the apparent superluminal motion and under the condition that the center of mass of a superluminal radio source remains in motion relative to the observer, the equation of the apparent velocity between nucleus and component is derived. Assuming that the directions of jet and movement of superluminal radio source are opposite, then, supposing that the velocities of nucleus and components of SLS are equal and the nucleus is fixed, the equations of real velocity are respectively derived. With the data of V_app and θ substituted in the equation of real velocity, the velocity of the components of SLS is obtained. Comparing the real velocity with the velocity of Hubble redshift of SLS, it is concluded that the movement of SLS has no influence on the velocity of components.     

Epoch of galaxy formation

A preferred epoch for forming galaxies argues strongly in favour of a standard Big Bang cosmology with a single epoch of creation. In this paper I present a model in which there is a causal connection between AGN activity and galaxy formation with its epoch closely linked to the observed epoch of peak AGN activity.