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 .