红蓝相间的鹈鹕星云

2021年03月01日

The Pelican Nebula in Red and Blue
Image Credit & Copyright: M. Petrasko, M. Evenden, U. Mishra (Insight Obs.)

Explanation: The Pelican Nebula is changing. The entire nebula, officially designated IC 5070, is divided from the larger North America Nebula by a molecular cloud filled with dark dust. The Pelican, however, is particularly interesting because it is an unusually active mix of star formation and evolving gas clouds. The featured picture was processed to bring out two main colors, red and blue, with the red dominated by light emitted by interstellar hydrogen. Ultraviolet light emitted by young energetic stars is slowly transforming cold gas in the nebula to hot gas, with the advancing boundary between the two, known as an ionization front, visible in bright red across the image center. Particularly dense tentacles of cold gas remain. Millions of years from now this nebula might no longer be known as the Pelican, as the balance and placement of stars and gas will surely leave something that appears completely different.

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Tomorrow’s picture: more from mars

红蓝相间的鹈鹕星云
影像来源及版权：M.Petrasko，M.Evenden，U.Mishra（Insight Obs.）

说明：鹈鹕星云正在变化之中。一个充满暗尘埃的分子云将正式名称为IC5070的这个星云与较大的北美星云分隔开。鹈鹕星云的有趣之处在于，它是异常活跃的恒星形成和演化中的气体云的混合体。这张经过处理后的特写图片呈现出两种主要颜色：红色与蓝色。其中红色以星际氢发射的光为主。年轻的高能恒星发出的紫外线正在慢慢地将星云中的冷气体转化为热气体，这两种气体之间的移动边界被称为电离锋，在图像中心呈现为明亮的红色。特别密集的冷气体仍然存在。数百万年后，这个星云可能不会再被称为鹈鹕，因为恒星与气体的平衡过程肯定会留下一些看起来完全不同的东西。

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