摘要
在本文中评述河外射电源变化的观测进展。首先对几个射电变源的一些专门术语和定义作介绍。然后叙述在整个频谱上（射电、红外、光学、紫外、X射线、γ射线）各种变化测量的结果，包括流量、频谱和偏振的变化。讨论了VLBI对变化研究的重要影响。简要地触及短时标变化引发的逆康普顿灾变的理论问题。最后，强调指出了多波段同时观测河外射电源在深入了解活动星系核方面的重要作用。
The observational progress in the study of the variability is reviewed. First, someconcise nomenclature and definitions are introduced of several variable radio sources.Then, the results from various measurements of variability (such as variations of flux,spectra and polarization) over a wide frequency range(radio, infrared, optical, ultraviolet,X-ray and γ-ray) are presented. The impact of VLBI on the study of the variability isalso discussed. As an introduction to the theoretical work, a short description of theinverse Compton catastrophe induced by short time-scale variation is given. Finally, theimportance is emphasized of simultaneous multi-frequency campaigns, in the wideningand deepening of our knowledge about active galactic nuclei.
出处
《天文学进展》
CSCD
北大核心
1995年第3期249-268,共20页
Progress In Astronomy
基金
攀登计划!"天体剧烈活动多波段观测和研究"
中国科学院射电天文联合实验室资助
美国史密松天体物理台博士前奖学金资助
关键词
星系
河外射电源
X射线
观测研究
galaxies
neclei-quasars
general-radio continunm
galaxies-ultraviolet
galaxies-X-rays
galaxies-gamma rays
observations
