Seyfert galaxies are energetic because they have a central black hole surrounded by a ring of gas.
赛非星系能量巨大，因为在其中心有-一黑洞，黑洞周围则环绕着环状星云。
In this paper, the distribution of four subclasses of four subclasses of Seyfert Galaxy Seyfert 1s, Seyfert 1.
文章比较了四种赛弗特星系子类1型赛弗特星系，1。
At the center of the starburst rings is the Seyfert nucleus, the believed signature of a supermassive black hole that is accreting surrounding gas and dust.
人们相信，在赛费特星系的中心，存在黑洞，依据就是环绕着星系的气体和灰尘。
Caption: a face-on snapshot of the small spiral galaxy NGC 7742, not just any old spiral galaxy but a Seyfert 2 - a galaxy that is probably powered by a black hole at its core.
描述：小螺旋星系ngc 7742正向快照，不只是古老的螺旋星系而是2型塞弗特星系——其动力可能由星系核心处的黑洞提供。
This particular galaxy is described as Seyfert 1 galaxy, which typically have bright centres emitting a broad range of hydrogen emission but narrow emission lines of heavier elements such as iron.
这个特别的星系归类于塞弗特1型星系，这是由于它拥有一个向四周大范围辐射氢元素的明亮核心，但奇怪的是，它还拥有数条狭窄的重元素发射带，例如铁元素。
This particular galaxy is described as Seyfert 1 galaxy, which typically have bright centres emitting a broad range of hydrogen emission but narrow emission lines of heavier elements such as iron.
这个特别的星系归类于塞弗特1型星系，这是由于它拥有一个向四周大范围辐射氢元素的明亮核心，但奇怪的是，它还拥有数条狭窄的重元素发射带，例如铁元素。
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