愛因斯坦環包圍著附近的星系中心
Einstein Ring Surrounds Nearby Galaxy Center
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來源:ESA,
NASA,
Euclid Consortium;
Processing:
J.-C. Cuillandre,
G. Anselmi, T. Li|發表日期:2025-02-26
看到環了嗎? 如果你仔細觀察特寫星系 NGC 6505 的中心,就會發現一個明顯的圓環。這就是 NGC 6505 的引力,也就是你很容易看到的附近(z = 0 . 042 )的橢圓星系的引力,它把一個遙遠星系的影像放大並扭曲成了一個完整的圓。要形成一個完整的愛因斯坦環,附近星系的中心和背景星系的一部分必須完全對齊。對這個圓環和背景星系的多幅影像進行分析,有助於確定 NGC 6505 中心暗物質的質量和比例,並揭示扭曲星系中以前從未見過的細節。 這張圖片由歐空局的地球軌道歐幾里德望遠鏡於 2023 年拍攝,並於本月初發布。
原文:Do you see the ring? If you look very closely at the center of the featured galaxy NGC 6505, a ring becomes evident. It is the gravity of NGC 6505, the nearby (z = 0.042) elliptical galaxy that you can easily see, that is magnifying and distorting the image of a distant galaxy into a complete circle. To create a complete Einstein ring there must be perfect alignment of the nearby galaxy's center and part of the background galaxy. Analysis of this ring and the multiple images of the background galaxy help to determine the mass and fraction of dark matter in NGC 6505's center, as well as uncover previously unseen details in the distorted galaxy. The featured image was captured by ESA's Earth-orbiting Euclid telescope in 2023 and released earlier this month.
※ 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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