NGC 7023 :虹膜星雲
NGC 7023: The Iris Nebula
![image](https://apod.nasa.gov/apod/image/2407/NGC7023_LRGB_fin_sig1024.jpg)
來源:Robert Shepherd|發表日期:2024-07-25
這些宇宙雲團綻放在 1300 光年之外的仙王座肥沃星域。NGC 7023 被稱為鳶尾星雲,它並不是唯一一個讓人聯想到花朵的星雲。不過,這幅深邃的望遠鏡影像還是展示了虹膜星雲的各種色彩和對稱性,它們鑲嵌在周圍的星際塵埃中。在虹膜星雲內部,塵埃狀星雲物質圍繞著一顆炙熱的年輕恆星。較亮的反射星雲的主色調是藍色,這是塵粒反射星光的特徵。反射星雲的中央細絲髮出微弱的紅色光致發光,這是因為一些塵粒有效地將恆星不可見的紫外線輻射轉換成了可見的紅光。紅外線觀測結果表明,這個星雲含有被稱為多環芳烴的複雜碳分子。虹膜星雲的藍色塵埃花瓣橫跨大約六光年。
原文: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.
※ 本文由萌芽機器人自動轉貼自每日一天文圖(Astronomy Picture of the Day,APOD),原文為英文,正體中文是透過 DeepL 翻譯及 OpenCC 進行自動處理,內容僅供參考,若有任何錯誤之處還請見諒!
關於每日一天文圖:每日一天文圖網站是美國國家航空暨太空總署與密西根理工大學提供的服務,網站每天提供一張影像或圖片,並由天文學家撰寫扼要說明其特別之處。