銀河透鏡 來自韋伯的銀河
Galaxy Lenses Galaxy from Webb

發表日期:2025-04-21
這是一個星系還是兩個星系?雖然看起來像一個,但答案是兩個。發生這種情況的一種途徑是一個小星系與一個大星系相撞,最後撞在了一起。但在這張特寫圖片中,發生的情況更為罕見。在這裡,中央的淺色橢圓星系要比環繞它的藍色和紅色螺旋星系近得多。這種情況可能發生在近星系和遠星系完全對齊的情況下,導致近星系的引力將遠星系的光線拉到它的周圍,這種效應被稱為引力透鏡效應。這個特寫的雙星系由韋伯太空望遠鏡拍攝,顯示了一個完整的愛因斯坦環,兩個星系的細節都清晰可見。 像這樣的星系透鏡可以揭示前景透鏡質量分佈和背景光源光分佈的新資訊。
原文:Is this one galaxy or two? Although it looks like one, the answer is two. One path to this happening is when a small galaxy collides with a larger galaxy and ends up in the center. But in the featured image, something more rare is going on. Here, the central light-colored elliptical galaxy is much closer than the blue and red-colored spiral galaxy that surrounds it. This can happen when near and far galaxies are exactly aligned, causing the gravity of the near galaxy to pull the light from the far galaxy around it in an effect called gravitational lensing. The featured galaxy double was taken by the Webb Space Telescope and shows a complete Einstein ring, with great detail visible for both galaxies. Galaxy lenses like this can reveal new information about the mass distribution of the foreground lens and the light distribution of the background source.
※ 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!
關於每日一天文圖:每日一天文圖網站是美國國家航空暨太空總署與密西根理工大學提供的服務,網站每天提供一張影像或圖片,並由天文學家撰寫扼要說明其特別之處。