How did the second AGN remain hidden for so long?
第二个活动星系核是如何保持隐藏了这么久？
Astronomers dub these Active Galactic Nuclei, or just AGN.
天文学家称这种天体为活跃星系核心，或简称为agn。
“We don’t observe more mergers in the AGN host galaxies,” Cisternas said.
我们没有观测更多AGN母星系的吞并。
We weren't seeing many double AGN, so we turned to Chandra for help.
“我们没有看到很多双活动星系核，所以我们求助于钱德拉”。
The result of this paper may be applied to the accretion discs in quasars and AGN.
本文结果可用于类星体和星系核吸积盘。
AGN changes in the optical spectra and light changes between standard Is there some relationship?
活动星系核的光学谱变化与光变时标之间是否存在某种关系？
The results show that these two models can qualitatively explain the AGN variability in the optical band.
结果表明：这两种模型是定性解释活动星系核光学波段光变的合理模型。
In some cool core clusters, re-searchers have found central X-ray cavities that are produced by AGN activity.
在冷核星系团中发现了许多中央活动星系核（AGN）活动所造成的X射线空洞，等。
This highlights the critical importance of high-resolution observations at high X-ray energies in locating binary AGN.
这显示在二进制活动星系核的定位在高x射线能量高清晰度观测至关重要。
The conclusion is: the short term variability behavior provides a strong support to the thick accretion disk model of AGN.
这些讨论表明，活动星系核的短时标光变特征对厚吸积盘模型提供了强有力的支持。
The dual AGN of Markarian 739 is the second-closest known, both in terms of distance from one another and distance from Earth.
马尔卡良双739的活动星系核是第二已知的最近，无论是在彼此的距离上，从地球的距离。
The survey is sensitive to AGN up to 650 million light-years away and has uncovered dozens of previously unrecognized systems.
这项调查是敏感的活动星系核高达650亿光年远，并发现了先前未知的系统几十人。
Their method indicates that the mass of distant AGN black holes as estimated by other spectral methods is two to 10 times too high.
他们的研究方法表明，用其他光谱方法测量的遥远活动星系核的黑洞质量大概夸大了2-10倍。
The new results suggest that the major events that form a bulge are the same as the major growth phases of its BH, when it shines as an AGN.
新的结果显示当一个椭圆星系喷发变成活动星系核时，椭圆星系形成的主要过程与其黑洞成长的主要阶段同步。
Despite this obscuring gas and dust around IC 4970, the Chandra data suggest that there is not enough hot gas in IC 4970 to fuel the growth of the AGN.
尽管IC 4970周围被气体和尘埃围绕，钱德拉的数据显示在IC 4970那没有充足的炙热气体以供agn的成长。
Data from Swift and Chandra reveal the western core (right) to be a previously unknown AGN; past studies already had identified an AGN in the eastern core.
钱德拉的数据，揭示了西方斯威夫特核心(右)是一个前所未知的活动星系核，过去的研究已经确定了一个核心的活动星系核在东。
"Markarian 739 West shows no evidence of being an AGN in visible, ultraviolet and radio observations," said coauthor Sylvain Veilleux, a professor of astronomy at UMCP.
“马卡良739西没有显示出作为一个在可见光，紫外线和射电观测活动星系核的证据，说：”西尔veilleux合作者，一个在UMCP天文学教授。
In this paper, using disk-instability model and starburst model, the AGN optical variability and spectral slope variability are simulated and confronted with observations.
本文中我们利用盘不稳定模型和星爆模型的基本思想，模拟活动星系核在光学波段的光度和光谱斜率变化，并将模拟的结果和观测进行比较。
New results from a premier sky survey by NASA's Swift satellite at hard (energetic) X-ray energies now solidly show a strong association of AGN with merging galaxies, though.
不过现在NASA的雨燕卫星在硬（高能）X射线的巡天新成果可靠地显示活动星系核与星系合并的紧密联系。
"If two galaxies collide and each possesses a supermassive black hole, there should be times when both black holes switch on as AGN," said coauthor Richard Mushotzky, professor of astronomy at UMCP.
“如果两个星系碰撞和每个人都拥有一个超大质量的黑洞，应当有两个黑洞的时候，作为活动星系核转，说：”作者之一理查德mushotzky，天文学教授UMCP。
"If two galaxies collide and each possesses a supermassive black hole, there should be times when both black holes switch on as AGN," said coauthor Richard Mushotzky, professor of astronomy at UMCP.
“如果两个星系碰撞和每个人都拥有一个超大质量的黑洞，应当有两个黑洞的时候，作为活动星系核转，说：”作者之一理查德mushotzky，天文学教授UMCP。
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