NGC 2403 in Camelopardalis
NGC 2403 in Camelopardalis
來源：(Team F.A.C.T.)｜發表日期：2024-06-03
壯觀的宇宙島 NGC 2403 位於長頸鹿星座的邊界內。這個螺旋星系距離地球約 1 , 000 萬光年，直徑約 5 萬光年，它似乎還擁有許多巨型恆星形成的 HII 區域，這些區域的標誌是原子氫氣體發出的微紅色光芒。巨大的 HII 區是由熾熱的大質量恆星群激發的，這些恆星在其短暫而狂暴的生命結束時會以明亮的超新星形式爆炸。作為 M 81 星系群的一員，NGC 2403 與我們本星系群中一個擁有大量恆星形成區的星系--三角座星系 M 33 非常相似。在 NGC 2403 的這幅肖像畫中，明亮的恆星位於前景，也就是我們銀河系內。在這幅深遠的廣視場望遠鏡影像的前景中，還有銀河昏暗多塵的星際雲，也被稱為銀河捲雲或綜合通量星雲。但是從 NGC 2403 本身延伸出來的微弱特徵很可能是與鄰近星系的引力相互作用所產生的潮汐恆星流。
原文：Magnificent island universe NGC 2403 stands within the boundaries of the long-necked constellation Camelopardalis. Some 10 million light-years distant and about 50,000 light-years across, the spiral galaxy also seems to have more than its fair share of giant star forming HII regions, marked by the telltale reddish glow of atomic hydrogen gas. The giant HII regions are energized by clusters of hot, massive stars that explode as bright supernovae at the end of their short and furious lives. A member of the M81 group of galaxies, NGC 2403 closely resembles a galaxy in our own local galaxy group with an abundance of star forming regions, M33, the Triangulum Galaxy. Spiky in appearance, bright stars in this portrait of NGC 2403 are in the foreground, within our own Milky Way. Also in the foreground of the deep, wide-field, telescopic image are the Milky Way's dim and dusty interstellar clouds also known as galactic cirrus or integrated flux nebulae. But faint features that seem to extend from NGC 2403 itself are likely tidal stellar streams drawn out by gravitational interactions with neighboring galaxies.
※ 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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