That is the supernova’s host galaxy.
那就是这颗超新星所在的星系。
Host galaxy
原声例句
Veritasium真理元素
TED演讲（视频版） 2022年7月合集
So it's like a subhalo orbiting its host galaxy.
所以它就像一个围绕其宿主星系运行的子晕。
英语科技文选
13. quasars are now thought to be black holes devouring material in the crowded centers of their host galaxies.
类星体现在被认为是吞噬宿主星系拥挤中心的物质的黑洞。
Crash Course 天文篇
As the material coalesces to create a galaxy, some falls to the center and feeds the black hole there; it grows as its host galaxy does.
当这些物质聚在一起形成星系时，一些物质会落到星系中心，并在那里形成黑洞：它像它的宿主星系一样成长。
Veritasium真理元素
They asked: if we see these four images of the supernova in one image of its host galaxy, when would the supernova appear in these other two images of the host galaxy?
既然我们在这个图像里看到了超新星爆发，那另外的两个图像里又该是什么时候出现超新星爆发呢？
中文百科
活动星系核 Active galactic nucleus
（重定向自寄主星系）
活动星系核（Active Galactic Nucleus，缩写为AGN）是一个星系中央区有比普通的星系的强烈很多的光度，至少部分波段或甚至可能全部波段里都发出很强的电磁波谱。被观察到的发射复盖从无线电波，微波，红外线，可见光，紫外线，X射线，到伽玛射线。光度大约在10-10J/s之间。容纳活动星系核的宿主星系为活跃星系。活跃星系核是这些星系明亮的核心部分，尺度通常在1光年上下，只占整个活跃星系的很小一部分。活动星系核（AGN）是在宇宙中的电磁辐射的最明亮的持久性的来源，并且因此可以被用作发现远方天体的方法；其演化的宇宙时间函数也设置了宇宙模型的制约条件。
英语百科
Active galactic nucleus 活动星系核
（重定向自Host galaxy）
An active galactic nucleus (AGN) is a compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion – and possibly all – of the electromagnetic spectrum. Such excess emission has been observed in the radio, microwaves, infrared, optical, ultra-violet, X-ray and gamma ray wavebands. A galaxy hosting an AGN is called an active galaxy. The radiation from an AGN is believed to be a result of accretion of mass by a supermassive black hole at the center of its host galaxy. AGN are the most luminous persistent sources of electromagnetic radiation in the universe, and as such can be used as a means of discovering distant objects; their evolution as a function of cosmic time also puts constraints on models of the cosmos.
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