2025年11月18日
银河平面: 电波与可见光的对比
影像提供: 电波: S. Mantovanini & the GLEAM team; 可见光: Axel Mellinger (milkywaysky.com)
说明: 银河系在电波波段下是什么样貌？为了更了解这一点，GLEAM计划使用在澳大利亚的默奇森宽场阵列（Murchison Widefield Array）对银河系的中心进行了高解析度的电波观测。随着影片的缓慢滚动，左侧显示的是电波波段（71-231 MHz），而右侧则是来自同一视野的可见光影像。两者差异如此之大，是因为大多数天体在电波和可见光波段的发光特性不同，而且可见光会被附近的星际尘埃阻挡。这些差异在朝向 银河系中心的方向上特别明显，大约在影片播放三分之一处可以看到。在电波波段中出现的众多特征中，明亮的红色斑块通常是已爆炸恒星的超新星残骸，而蓝色区域则是充满明亮年轻恒星的恒星育婴室。
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明日的图片: the big V
The Galactic Plane: Radio Versus Visible
Image Credit: Radio: S. Mantovanini & the GLEAM team; Visible: Axel Mellinger (milkywaysky.com)
Explanation: What does the Milky Way look like in radio waves? To better find out, GLEAM surveyed the central band of our galaxy in high resolution radio light as imaged by the Murchison Widefield Array in Australia. As the featured video slowly scrolls, radio light (71 – 231 MHz) is seen on the left and visible light — from the same field — on the right. Differences are so great because most objects glow differently in radio and visible light, and because visible light is stopped by nearby interstellar dust. These differences are particularly apparent in the direction toward the center of our galaxy, seen about a third of the way through. Among the many features that appear in the radio, bright red patches are usually supernova remnants of exploded stars, while areas colored blue are stellar nurseries filled with bright young stars.
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Tomorrow’s picture: the big V
