NGC 7023：虹膜星云
(原标题: NGC 7023: The Iris Nebula)
2023-09-02
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这些宇宙云在1300光年外的仙王座富饶的星空中绽放。被称为虹膜星云的NGC 7023并不是唯一一个让人联想到花朵的星云。尽管如此，这张深望远镜拍摄的图像展示了虹膜星云在周围星际尘埃中的颜色范围和对称性。在虹膜内部，尘埃状星云物质围绕着一颗炙热的年轻恒星。较亮的反射星云的主要颜色是蓝色，这是反射星光的尘埃颗粒的特征。反射星云的中心细丝发出淡红色的光，因为一些尘埃颗粒有效地将恒星不可见的紫外线辐射转化为可见的红光。红外观测表明，这个星云含有被称为多环芳烃的复杂碳分子。虹膜星云的灰蓝色花瓣跨度约6光年。
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These cosmic clouds have blossomed 1,300 light-years away in the fertile starfields of the constellation Cepheus. Called the Iris Nebula, NGC 7023 is not the only nebula to evoke the imagery of flowers. Still, this deep telescopic image shows off the Iris Nebula's range of colors and symmetries embedded in surrounding fields of interstellar dust. Within the Iris itself, dusty nebular material surrounds a hot, young star. The dominant color of the brighter reflection nebula is blue, characteristic of dust grains reflecting starlight. Central filaments of the reflection nebula glow with a faint reddish photoluminescence as some dust grains effectively convert the star's invisible ultraviolet radiation to visible red light. Infrared observations indicate that this nebula contains complex carbon molecules known as PAHs. The dusty blue petals of the Iris Nebula span about six light-years.
© Lorand Fenyes