活动星系核

光变是活动星系核的普遍现象，从射电到X射线的所有波段都观测到了活动星系核的光变。

Variability is a common phenomenon in AGN and is observed over wide range from radio to X-ray .

EGRET已检测到66颗可信度很高的活动星系核。

EGRET has detected 66 AGN with high reliability .

新发现的X射线选活动星系核、白矮星和激变变星

Discovery of X-ray Selected AGNs , a White Dwarf and a Cataclysmic Variable

宇宙X射线背景辐射与活动星系核

Cosmic X-Ray Background Radiation and Active Galactic Nuclei

通过分析该样本中的活动星系核的宽波段能量分布，确认了来自射电、光学和X射线波段的辐射光度之间的显著相关性。

The broad band energy distribution of the AGNs in the authors ' sample is shown .

这显示在二进制活动星系核的定位在高X射线能量高清晰度观测至关重要。

This highlights the critical importance of high-resolution observations at high X-ray energies in locating binary AGN .

我们得到了活动星系核在B、V波段合理的光变曲线以及光谱斜率和光度之间的正相关性。

We get reasonable light curves in B and V bands and find a positive correlation between variability and spectral slope .

活动星系核的铁Kα和铁Kβ发射线&Cerenkov线状辐射的进一步证据

Iron K α and K β Lines in Active Galactic Nuclei ( AGNs ) - Evidence of the Existence of the Cerenkov Line-Like Radiation

这是因为许多X射线双星和活动星系核的周期性光变与盘的不稳定性密切相关。

This is because a lot of quasi-periodic variations in X-ray binaries and active galactic nuclei are believed to be related to the instabilities of the disk .

对河外星系OH超脉泽的观测和研究，是探测和研究其所成协的活动星系核、星暴星系的中央源和拱核盘的有效工具。

The observations and studies of the OH megamasers associated with AGN and starburst galaxies are the very efficient tools to investigate characteristics of their central sources an .

活动星系核（ActiveGalacticNucleus）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。

Active Galactic Nucleus ( AGNs ) have been an important branch and one of the most active frontiers in the field of modern astrophysics .

河外IRAS源，星暴星系和活动星系核

Extragalactic IRAS Sources , Starburst Galaxis and Active Galactic Nucleus

第三章是关于伽玛暴的射电光度与X射线光度的相关性研究，以及这一关系是否可以与太阳、冷星、活动星系核等统一的问题。

Chapter III is about the correlation studies between radio luminosity and X-ray luminosity of GRBs , and whether the relationship can be extended to the sun , cool stars and active galactic nuclei .

EGRET活动星系核的VLBI观测研究

VLBI Observations of EGRET-detected AGNs

窄线Seyfert1型星系（NLS1）作为活动星系核的一个小类，由于其X射线等高能波段上独特的观测特征，近年来越来越受到天文学界的广泛关注。

Narrow-Line Seyfert 1 Galaxies ( NLSls ), as one subclass of Active Galactic Nuclei ( AGNs ), are more and more widely paid attention by astronomers because of their special observational characteristics in X-ray band .

活动星系核分为类星体，塞弗特星系，射电星系，Blazar，Liner等。

The active galactic nucleus divides into QSO , Seyfert galaxies , radio galaxy , Blazar , Liner and so on .

EGRET检测到的γ射线活动星系核的射电图像

Radio images of egret detected Agn

其结果表明活动星系核的Gev伽玛辐射可以被用作宇宙标准烛光。

Our results show that the Gev Gamma-ray emissions of AGNs can be used as cosmological standard candles indeed .

这些结果为解释BLLac天体、Seyfert星系及类星体等活动星系核的光变现象进一步提供了理论依据。

Those results are very useful to the explanation of the luminosity variations of BL Lac objects , Seyfert galaxies and quasars .

类星体和活动星系核结构的变化及其中的视超光速运动，被认为是用VLBI方法所揭示的最重大的天体物理现象之一。

The structural variations and superluminal motion within some QSSs and AGNs are considered as one of the most important astrophysical phenomena revealed by VLBI .

活动星系核（AGN）的宽线区（BLR）（Ⅰ）

The Broad-line Region in Active Galactic Nuclei (ⅰ)

根据简化的活动星系核的统一模型，假设窄线区气体成球状分布，那么应观测到塞弗特2型星系的窄线区电离气体成V状（电离锥）。

According to the simplified unification model of active galactic nuclei ( AGN ), assuming that the gas in the NLR is spherically distributed , V-shape morphology ( ionization cone ) is expected to be observed in Seyfert 2 galaxy .

光变是活动星系核（AGN）的共同特征，光变规律的研究已成为人类探索活动星系核物理的有力手段。

Optical variability is a common property of AGNs , Which provides a potentially powerful tool to probe the physics of AGNs .

类星体是活动星系核（AGN）的一种，是我们迄今为止探测到的最遥远的天体。

Quasars is one category of active galactic nuclei ( AGN ), which is can be detected in the most distance so far .

黑洞双星、中等质量黑洞和活动星系核（AGNs）都被观测到存在QPO。

QPOs have been observed in BH binaries , intermediate mass BHs and active galactic nuclei ( AGNs ) .

在本文中，我们主要关注讨论得最多的活动星系核，特别是blazar天体中的喷流过程。

In this present paper , we focus on the radiative processes of AGN , especially blazar 's jets mostly discussed yet .

这些宽线活动星系核（ActiveGalacticNuclei，AGN）的光学谱均含有大质量中等年龄星族的光谱标志性特征，这使其适合用来研究AGN及其寄主星系之间的关系。

The optical spectra of these broad-lined active galactic nuclei ( AGNs ) simultaneously show spectral signatures of massive intermediate-aged stellar populations making them good candidates for studying the connections between AGNs and their hosts .

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。

This paper reports some recent progresses in the VLBI observation of the AGNs , specially those in the investigations about the central structure of the AGNs and the low luminosity AGNs .

活动星系核（AGNs：ActiveGalacticNuclei）是近年来天体物理学中非常活跃的研究领域，涉及天体物理学的最基本的问题，活动星系核的研究在能量产生，辐射机制等基本问题中占有重要的地位。

In recent years , active galactic nuclei are very hot researching-fields in astrophysics . They are related to the most fundamental problems in astrophysics . The research of Active galactic nuclei is very important in many fundamental problems , such as producing-energy , radiant mechanism .

EGRET空间望远镜已检测到66颗高置信度的γ射线活动星系核.这些活动星系核都是射电强的，具有很高的光度，迅速的光学变化，有相当的比例是机超光速源。

Active galactic nuclei ( AGNs ) with high-confidence level have been detected by EGRET identification . All these AGNs are the radio bright , with the dramatic peak of the luminosity spectra at γ - ray frequencies , rapid optical variability , and the high fraction of superluminal sources .