They also didn't compare active galaxies to those with quiet black holes.
它们也没有把活动星系同那些黑洞活动相对平静的星系作比较。
This scenario may explain why only 10% of active galaxies have radio jets, and how active galaxies evolve over time.
这种假设或许可以解释为什么活跃星系中只有10%存在喷流，以及它们如何持续演变。
This morning we noticed that one of the many active galaxies in the Fermi sky had become extremely bright in gamma-rays.
早上，我们从费米伽马射线图中的众多活跃星系中观察到，其中一个星系的伽马射线变得极度明亮。
The scientists rounded up the usual suspects — 140 active galaxies in all — and compared them with a control group of 1200 inactive galaxies.
科学家们围捕了通常的嫌疑人——总共140个活跃星系——并将它们和一个1200个非活跃星系组成的对照组作比较。
A small percentage of galaxies called active galaxies emit tremendous amounts of energy.
有一小部分被称做活动星系的星系放射出巨大的能量。
Searche for rapid variability in the flux from active galaxies has the Promise of being a very powerful tool for understanding their emission mechanisms.
探索活动星系的快速光变，是研究星系中心致密核结构及辐射机制的强有力手段。
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.
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。
From the viewpoint of cosmological evolution it seems that the optical variation of QSOs becomes more violent with the cosmological time, and finally it connects itself with that of active galaxies.
从宇宙演化的角度来看，类星体的光变随着宇宙时愈演愈烈，最后与活动星系相接。
In this thesis, we present the studies of the central engine and radio jets in radio-loud Active Galaxies Nuclei.
本篇论文主要对射电强活动星系核的中央引擎和射电喷流的性质进行了一些研究。
Active galaxies give off bright radiation from their cores, where gas heats up as it is compressed into a swirling accretion disk encircling the black hole.
活动星系从它们的核部发出明亮的光芒，在那里，气体被加热并压缩成一个漩涡状的圆盘，漩涡的中心便是黑洞。
Active galaxies give off bright radiation from their cores, where gas heats up as it is compressed into a swirling accretion disk encircling the black hole.
活动星系从它们的核部发出明亮的光芒，在那里，气体被加热并压缩成一个漩涡状的圆盘，漩涡的中心便是黑洞。
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