来自韦伯的星系透镜
(原标题: Galaxy Lenses Galaxy from Webb)
2025-04-21
浏览次数: 38
这是一个星系还是两个星系？虽然看起来是1，但答案是2。发生这种情况的一个途径是当一个小星系与一个大星系碰撞并最终在中心结束。但在这张特色图片中，更罕见的事情正在发生。在这里，中心的浅色椭圆星系比环绕它的蓝色和红色螺旋星系要近得多。当近星系和远星系完全对齐时，就会发生这种情况，导致近星系的引力把周围远星系的光吸引过来，这种效应被称为引力透镜效应。这张由韦伯太空望远镜拍摄的双星系照片显示了一个完整的爱因斯坦环，两个星系的细节都很清晰。像这样的星系透镜可以揭示关于前景透镜的质量分布和背景光源的光分布的新信息。
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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.