活动星系（Active Galaxy）是一类特殊的星系，在这类星系中存在着激烈的物理过程，如激波、喷流和恒星爆发等，同时伴随着在各种电磁波段的巨大能量释放。
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active galaxy nucleus 活动星系核 ; 本文综述了活动星系核
active galaxy nuclei ngc 活动星系核
N a galaxy that emits usually large amounts of energy from a very compact central source, such as Seyfert galaxies, radio galaxies, and quasars 活动星系 (Also called active galactic nucleus)
It is an active galaxy lying at the centre of the Perseus Cluster of galaxies.
它是个位于英仙座星系群中心的活动星系。
Galaxies can be divided into two classes: normal galaxy (NG) and active galaxy (AG).
星系通常分为正常星系(NG)与活动星系(AG)两类。
The location of this flaring active galaxy is very fortunate. It is about 38 deg away from a star known as V407 Cyg.
这个活跃的发光星系的位置是非常幸运的，距离被称为V407 Cyg(天鹅座- V407号星)的亮星约38度。
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