M 33 的氫雲
Hydrogen Clouds of M33
來源：Pea Mauro｜發表日期：2025-01-30
華麗的螺旋星系Messier 33 似乎擁有比它更多的發光氫氣。作為本星系群的一個重要成員，M 33 也被稱為三角座星系，距離我們只有 300 萬光年。 在這幅清晰的星系畫像中，我們看到了星系中心約 6 萬光年的區域。這幅畫展示了 M 33 的紅色電離氫雲或 HII 區。M 33 的巨大HII 區沿著蜿蜒向核心的鬆散旋臂蔓延，是已知最大的恆星苗圃，也是形成壽命短但質量非常大的恆星的場所。這些發光的大質量恆星發出的強烈紫外線輻射會電離周圍的氫氣，最終產生特有的紅光。在這幅影像中，寬頻資料與透過濾光片記錄的窄帶資料相結合，濾光片能透過最強的可見氫和氧發射線的光線。
原文：Gorgeous spiral galaxy Messier 33 seems to have more than its fair share of glowing hydrogen gas. A prominent member of the local group of galaxies, M33 is also known as the Triangulum Galaxy and lies a mere 3 million light-years away. The galaxy's central 60,000 light-years or so are shown in this sharp galaxy portrait. The portrait features M33's reddish ionized hydrogen clouds or HII regions. Sprawling along loose spiral arms that wind toward the core, M33's giant HII regions are some of the largest known stellar nurseries, sites of the formation of short-lived but very massive stars. Intense ultraviolet radiation from the luminous, massive stars ionizes the surrounding hydrogen gas and ultimately produces the characteristic red glow. In this image, broadband data were combined with narrowband data recorded through a filter that transmits the light of the strongest visible hydrogen and oxygen emission lines.
※ 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！
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