M 102 :邊緣盤星系
M102: Edge-on Disk Galaxy

發表日期:2024-03-06
這是一個什麼樣的天體?一個相對正常的星系--不過是從它的邊緣看過去的。 許多盤狀星系實際上就像圖中的紡錘星系NGC 5866 一樣薄,但從我們的視角卻看不到它的邊緣。 我們更熟悉的一個邊緣星系是銀河系。 紡錘星系也被編入 M 102 星系目錄,它有許多複雜的塵埃通道,呈現出暗紅色,而星盤中許多明亮的恆星則使它呈現出更加藍色的底層色調。 在這張哈勃影像中,我們可以看到由年輕恆星組成的藍色圓盤在極薄的銀河面上延伸過塵埃。有證據表明,紡錘星系在過去的十億年左右的時間裡吞噬了更小的星系,其中包括多股暗淡恆星流、從主星系平面延伸出去的暗色塵埃,以及周圍的星系群(未顯示)。 一般來說,許多盤狀星系都會變得很薄,因為形成它們的氣體在圍繞引力中心旋轉時會與自身發生碰撞。紡錘星系位於距離龍星座(天龍座)大約 5000 萬光年的地方。
原文:What kind of celestial object is this? A relatively normal galaxy -- but seen from its edge. Many disk galaxies are actually just as thin as NGC 5866, the Spindle galaxy, pictured here, but are not seen edge-on from our vantage point. A perhaps more familiar galaxy seen edge-on is our own Milky Way galaxy. Also cataloged as M102, the Spindle galaxy has numerous and complex dust lanes appearing dark and red, while many of the bright stars in the disk give it a more blue underlying hue. The blue disk of young stars can be seen in this Hubble image extending past the dust in the extremely thin galactic plane. There is evidence that the Spindle galaxy has cannibalized smaller galaxies over the past billion years or so, including multiple streams of faint stars, dark dust that extends away from the main galactic plane, and a surrounding group of galaxies (not shown). In general, many disk galaxies become thin because the gas that forms them collides with itself as it rotates about the gravitational center. The Spindle galaxy lies about 50 million light years distant toward the constellation of the Dragon (Draco).
※ 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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