Bille and his team work with an optical instrument called an active mirror—a device used in astronomical telescopes to spot newly emerging stars and far distant galaxies.
比尔和他的团队使用一种被称为“活动镜”的光学仪器，这是一种在天文望远镜的种类中用来发现新出现的恒星和遥远星系的仪器。
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。
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。
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。
Simulations have found that black holes and galaxies grow together. Some observations even suggested that galaxies with active galactic nuclei were slightly distorted, a sign of a recent collision.
仿真的结果表明，黑洞是和星系一同成长的，一些观测结果甚至显示一些含有活动星系核的星系有轻微的扭曲，这是近期发生碰撞的标志。
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。
Most galaxies are like that, as it happens, but there are a few rougher neighborhoods where the black holes cause their share of mayhem in the form of active galactic nuclei (AGNs).
大部分星系都是如此，但有一些粗暴的邻居的黑洞让它们以活动星系核(agn)的形式对外散布伤害。
They behave as scaled-down versions of much more massive black holes that are at the cores of extremely active galaxies, called quasars.
它们的表现可以极端活跃星系（称为类星体）中心的大型黑洞作为参照。
Earlier studies looked only at galaxies with the brightest active nuclei, which could have biased their results, Jahnke said.
先前的研究只关注存在有明显活动星核的星系，这很可能导致结果产生偏差，Jahnke说。
They did this by taking a peek at an astronomers' catalogue of 318 active galaxies located within 300m light years of Earth.
它们通过窥视一位天文学家列出的318个离地球三亿光年的活跃星系而完成了这个试验。
PKS 1502+106, and PKS 0727-115 are active galaxies billions of light-years distant.
在我们的银河系之外：巨大的星系NGC 1275位于离我们 2.33 亿光年远的英仙座星系团的中心，而3C 454.3 PKS1502+106PKS 0727-115是距离我们数十亿光年远的活跃星系团。
Quasars are the very active centers of galaxies though to surround the central supermassive black hole.
类星体是星系中最活跃的中心，尽管他们围绕着中心特大质量黑洞。
In the other galaxies, the supermassive black holes are less active, and the star-making process is evident.
在其他黑洞活动比较少的星系中，新的星体的形成过程是很明显的。
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。
They selected about 100 galaxies containing active supermassive black holes.
他们挑选了大约100个含有黑洞的星系。
They used data in the optical regime collected by the Hubble space telescope, as well as X-ray data collected by ESA's XMM-Newton space telescope to identify the active galaxies.
他们用由哈勃太空望远镜收集的光学信息数据和由esa的XMM -牛顿太空望远镜收集的x光数据来识别活跃星系。
The team chose 140 active galactic nuclei, or AGNs, by selecting galaxies that emit a lot of X-rays, which can Pierce the galactic gas and dust that might otherwise block the nuclei from view.
课题小组选择了140个活动星系核，或简称agns，这些星系都放射出大量的X射线，X射线能穿透阻挡观测的气体和尘埃。
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。
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。
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。
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。
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。
There are many kinds of galaxies. Spiral galaxies like our own MilkyWay have active regions of star formation.
有许多种星系，我们银河系这样的漩涡星系有着活跃的星体形成。
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。
The hard X-rays more readily penetrate dust and gas clouds in merging galaxies and reveal the presence of emission from the active black holes.
活跃黑洞所发出的硬X射线辐射，可轻易穿透合并星系的尘埃和气体云，因此我们得以见到这些辐射。
The hard X-rays more readily penetrate dust and gas clouds in merging galaxies and reveal the presence of emission from the active black holes.
活跃黑洞所发出的硬X射线辐射，可轻易穿透合并星系的尘埃和气体云，因此我们得以见到这些辐射。
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