Copyright:
原文:
What are those strange blue objects? Many of the brightest blue images are of a single, unusual, beaded, blue, ring-like galaxy which just happens to line-up behind a giant cluster of galaxies. Cluster galaxies here typically appear yellow and — together with the cluster’s dark matter — act as a gravitational lens. A gravitational lens can create several images of background galaxies, analogous to the many points of light one would see while looking through a wine glass at a distant street light. The distinctive shape of this background galaxy — which is probably just forming — has allowed astronomers to deduce that it has separate images at 4, 10, 11, and 12 o’clock, from the center of the cluster. A blue smudge near the cluster center is likely another image of the same background galaxy. In all, a recent analysis postulated that at least 33 images of 11 separate background galaxies are discernable. This spectacular photo of galaxy cluster CL0024+1654 from the Hubble Space Telescope was taken in November 2004.
中文翻譯:
這些奇怪的藍色物體是來自一個不尋常的環狀星系，它出現在一個巨型星系團的背後。這個星系團中的星系通常是黃色的，並且與星系團中的暗物質一起，形成了引力透鏡的效應。引力透鏡能夠產生背景星系的多個影像，就像透過一個酒杯看遠處街燈時所見的多個光點一樣。這個背景星系的獨特形狀顯示出，它在不同位置（大約4點、10點、11點和12點的位置）有多個影像，從星系團的中心看過去。在星系團的中心附近還有一個藍色的模糊影像，可能也是同一個背景星系的另一個影像。根據最近的分析，科學家推測至少能辨別出33個影像，來自11個不同的背景星系。這張來自哈勃太空望遠鏡的壯觀照片拍攝於2004年11月，對於研究星系形成和引力透鏡的科學家而言，提供了重要的資料。
#星系團 #藍色星系 #引力透鏡 #哈勃太空望遠鏡 #宇宙奇觀 #天文學 #科學探索 #CL0024+1654
來源:NASA每日圖片
