天文学家称这种天体为活跃星系核心，或简称为agn。
欧洲空间局在轨运行的XMM-牛顿天文台对名为1h0707 - 495的活跃星系核心中的黑洞进行了研究。
The European Space Agency's orbiting XMM-Newton observatory studied the black hole in the core of an active galaxy known only as 1h0707-495.
类星体是遥远星系的极为活跃的核心体。
M 87是邻近我们的一个星系。从照片上观察，位于它核心的黑洞，四周的微尘环要不就不存在，要不就是非常稀薄，这是与其他较为活跃的星系比较的结论。
Imaging of nearby galaxy M87's core reveals that the black hole residing there has either a nonexistent or much fainter ring of dust around it compared with other active galaxies.
钱德拉装有敏感的X线检测器，天文学家用它对准这星系的核心，但愿确定两个活跃点中是否有一个为黑洞。
When Chandra, with its sensitive X-ray detectors, focused on the nuclei, astronomers hoped it would tell them whether either of the two points of activity were black holes.
钱德拉装有敏感的X线检测器，天文学家用它对准这星系的核心，但愿确定两个活跃点中是否有一个为黑洞。
When Chandra, with its sensitive X-ray detectors, focused on the nuclei, astronomers hoped it would tell them whether either of the two points of activity were black holes.
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