Active Galaxies活动星系
Some galaxies are classified as active galaxies because of the extraordinary variability and evidence of strong interactions in their galactic nuclei. Some examples are Seyfert galaxies, B. L. Lacertae objects, and quasars. 一些星系被归类为活动星系，是因为其核区表现出异常的变异性以及强相互作用的证据。一些例子包括赛弗特星系、BL Lac天体和类星体。
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Active Galactic Nuclei活动星系核
Compared to ordinary galaxies, some galactic nuclei have extraordinary luminosities and are called active galaxies. The most dramatic examples are the quasars. Other active galactic nuclei have unusually bright, starlike nuclei, or have strong emission lines, or show high variability. Some have streams or jets coming from their cores. One class of active galaxies is the Seyfert galaxies. 与普通星系相比，一些星系核具有异常的高光度，被称为活动星系。最显著的例子是类星体。其他活动星系则表现出异常明亮的星状核，或有强发射线，或表现出高度的变异性。有些星系有从核心发出的流或喷流。活动星系的一类是塞弗特星系。
Because of the enormous energies coming from rather small volumes, it is often suggested that these nuclei have massive black holes at their centers as a source of energy for the extraordinary luminosity. To date, the active galaxy M87 seems to be the best candidate. 由于来自很小体积的巨大能量，人们常常认为这些核体中心可能有质量极大的黑洞作为能量来源，以解释其异常的高光度。截至目前，活跃星系M87似乎是最有希望的候选者。
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Index Black hole concepts Galaxy concepts 索引 黑洞概念 星系概念 | ||
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