Arp 273的特殊星系
(原标题: Peculiar Galaxies of Arp 273)
2022-02-19
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在这个后院望远镜框架的前景中，尖锐的恒星远在我们自己的银河系内。但这两个引人注目的星系远在银河系之外，距离超过3亿光年。它们扭曲的外观是由于它们近距离接触时的引力潮汐造成的。编号为Arp 273（也称为UGC 1810）的星系确实看起来很奇怪，但现在人们认为相互作用的星系在宇宙中很常见。在它附近，巨大的螺旋形仙女座星系距离我们大约200万光年，正在接近银河系。Arp 273的奇特星系可能提供了它们在遥远未来相遇的模拟。在宇宙时间尺度上重复的星系相遇最终会导致合并成一个单一的恒星星系。从我们的角度来看，Arp 273星系的明亮核心之间的距离只有10万光年多一点。
查看原文解释
The spiky stars in the foreground of this backyard telescopic frame are well within our own Milky Way Galaxy. But the two eye-catching galaxies lie far beyond the Milky Way, at a distance of over 300 million light-years. Their distorted appearance is due to gravitational tides as the pair engage in close encounters. Cataloged as Arp 273 (also as UGC 1810), the galaxies do look peculiar, but interacting galaxies are now understood to be common in the universe. Nearby, the large spiral Andromeda Galaxy is known to be some 2 million light-years away and approaching the Milky Way. The peculiar galaxies of Arp 273 may offer an analog of their far future encounter. Repeated galaxy encounters on a cosmic timescale can ultimately result in a merger into a single galaxy of stars. From our perspective, the bright cores of the Arp 273 galaxies are separated by only a little over 100,000 light-years.
© Jason Guenzel