Arp 273的特殊星系
(原标题: Peculiar Galaxies of Arp 273)
2025-01-09
浏览次数: 29
在这张用小型望远镜在地球上拍摄的照片中，彩色的尖状恒星位于前景。它们远在我们的银河系内。但这幅图中两个引人注目的星系远在银河系之外，距离我们超过3亿光年。星系扭曲和扭曲的外观是由于它们在近距离接触时相互的引力潮汐造成的。这些星系编号为Arp 273（也称为UGC 1810），看起来确实很奇怪，但现在人们认为相互作用的星系在宇宙中很常见。在离地球更近的地方，巨大的螺旋形仙女座星系距离我们大约200万光年，正在无情地靠近银河系。事实上，遥远的奇特星系Arp 273可能提供了仙女座星系和银河系在遥远未来相遇的类比。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 colorful, spiky stars are in the foreground of this image taken with a small telescope on planet Earth. They lie well within our own Milky Way Galaxy. But the two eye-catching galaxies in the frame lie far beyond the Milky Way, at a distance of over 300 million light-years. The galaxies' twisted and distorted appearance is due to mutual gravitational tides as the pair engage in close encounters. Cataloged as Arp 273 (also as UGC 1810), these galaxies do look peculiar, but interacting galaxies are now understood to be common in the universe. Closer to home, the large spiral Andromeda Galaxy is known to be some 2 million light-years away and inexorably approaching the Milky Way. In fact the far away peculiar galaxies of Arp 273 may offer an analog of the far future encounter of Andromeda and Milky Way. Repeated galaxy encounters on a cosmic timescale 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.
© Dave Doctor