Astronomers dub these active galactic nuclei , or just agn .

天文学家称之为活动星系核，或简称agn。

He plans to spend another two years comparing black holes with and without jets , hoping to learn more about the properties of agn .

他计划再花两年去对比有无喷发的黑洞，希望以此对agn特性有更多了解。

But for decades only about 1 percent of agn seemed to be associated with galaxy mergers .

但数十年观测发现仅约百分之一的活动星系核与星系合并有关联。

Nustar will help researchers conduct a " giant census " of supermassive black holes that " will absolutely revolutionize the way we look at x-ray spectra of agn , " evans explained .

nustar将帮助研究人员对黑洞“大调查”，它“将革命性的改变我们观察agn光谱的方法，”伊万斯解释说。