熔化的星系爱因斯坦环
(原标题: A Molten Galaxy Einstein Ring)
2022-07-05
浏览次数: 17
要把一个星系隐藏在星系团后面是很困难的。距离较近的星团的引力就像一个巨大的透镜，将遥远星系的图像拉到周围，并极大地扭曲它们。这正是在哈勃太空望远镜最近重新处理的图像中观察到的情况。星系团GAL-CLUS-022058c由许多星系组成，并将图像中黄红色的背景星系透镜变成了图像中心周围的弧形。由于其不寻常的形状被称为熔融的爱因斯坦环，同一背景星系的四张图像已经被识别出来。通常情况下，前景星系团只有在其大部分质量均匀分布的情况下才能创造出如此光滑的弧线，因此不会集中在可见的星系团中。分析这些引力弧的位置为天文学家提供了一种估计星系团中暗物质分布的方法，并推断出这些早期星系中的恒星何时开始形成。新的阿拉伯语APOD社交镜子：在Facebook， Instagram和Twitter上
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It is difficult to hide a galaxy behind a cluster of galaxies. The closer cluster's gravity will act like a huge lens, pulling images of the distant galaxy around the sides and greatly distorting them. This is just the case observed in the featured image recently re-processed image from the Hubble Space Telescope. The cluster GAL-CLUS-022058c is composed of many galaxies and is lensing the image of a yellow-red background galaxy into arcs seen around the image center. Dubbed a molten Einstein ring for its unusual shape, four images of the same background galaxy have been identified. Typically, a foreground galaxy cluster can only create such smooth arcs if most of its mass is smoothly distributed -- and therefore not concentrated in the cluster galaxies visible. Analyzing the positions of these gravitational arcs gives astronomers a method to estimate the dark matter distribution in galaxy clusters, as well as infer when the stars in these early galaxies began to form. New APOD Social Mirrors in Arabic: On Facebook, Instagram, and Twitter