Arp 273 的奇特星系
Peculiar Galaxies of Arp 273

來源:Dave Doctor|發表日期:2025-01-09
這幅用地球上的小型望遠鏡拍攝的照片中,前景是五顏六色、長滿尖刺的恆星。它們位於我們的銀河系內。但畫面中兩個引人注目的星系卻遠在銀河系之外,距離超過 3 億光年。這兩個星系扭曲變形的外觀是由於它們在近距離相遇時相互產生的引力潮汐造成的。這些星系被編入Arp 273 (也被編入UGC 1810 ),它們看起來確實很奇特,但現在人們已經明白,相互作用的星系在宇宙中很常見。在離銀河系更近的地方,人們知道大型螺旋星系仙女座星系距離銀河系大約 200 萬光年,並且正在不可阻擋地向銀河系靠近。 事實上,Arp 273 的遙遠奇特星系可能就是仙女座星系和銀河系在遙遠未來相遇的模擬。星系在宇宙時間尺度上的反覆相遇最終會導致合併成一個由恆星組成的星系。從我們的角度來看,Arp 273 星系的明亮核心之間的距離只有 10 萬光年多一點。
原文: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.
※ 本文由萌芽機器人自動轉貼自每日一天文圖(Astronomy Picture of the Day,APOD),原文為英文,正體中文是透過 DeepL 翻譯及 OpenCC 進行自動處理,內容僅供參考,若有任何錯誤之處還請見諒!
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