致密射电核

活动星系统的多波段观测和研究，早已成为天体物理学最热门的前沿之一。在射电天文学中，按其观测形态又常将ＡＧＮ和致密射电核等同看待。对ＡＮＧ及ＣＲＣ的含义、分类、总的频谱特征、射电结构和射电性质，模型研究及ＶＬＢＩ的重要作用、最新的观测结果、问题和前景作一评述。评述中将侧重于用射电天文手段观测研究ＣＲＣ的结果。

The Compact Radio Cores-An Overview

Multiband observations and studies of the active galactic nuclei (AGN) have be-come one of the most fascinating frontiers in astrophysics since the 1970 s. In radio astronomy, the AGNs are generally assumed to be coincident with the compact radio cores (CRC) in extragalactic sources. The senses, the classification, the overall spectra, the radio strllctures and properties of the AGNs and CRCs are reviewed in this paper.The "standard model" and the important role of the VLBI in understanding the AGNs are outlined briefly. Some recent results and prospect are introduced in the last part of the paper. The emphaJsis is put on observed and studied results of the CRCs by using radio astronomical facilities throughout the paper.