IFN 和 NGC 7771 星團
IFN and the NGC 7771 Group
來源：Steve Mandel｜發表日期：2024-08-31
NGC 7771 星團的星系出現在這幅引人入勝的天景圖中。NGC 7771 距飛馬座約 2 億光年，是靠近中心的一個大型邊緣螺旋星系，直徑約 75000 光年，下面有兩個較小的星系。大型螺旋星系 NGC 7769 位於右側。NGC 7771 星系群中的星系正在相互作用，不斷地靠近，最終將在宇宙時間尺度上導致星系-星系的合併。透過星系本身形狀的扭曲和相互引力潮汐產生的微弱恆星流，可以追蹤到這種相互作用。但是，要想清晰地看到這個星系群是很困難的，因為深層影像還顯示出大量的前景塵埃雲橫掃視野。這些暗淡的、佈滿塵埃的星系捲雲被稱為綜合通量星雲（Integrated Flux Nebulae）。暗淡的綜合流量星雲反射著來自銀河系的星光，距離銀河平面只有幾百光年。
原文：Galaxies of the NGC 7771 Group are featured in this intriguing skyscape. Some 200 million light-years distant toward the constellation Pegasus, NGC 7771 is the large, edge-on spiral near center, about 75,000 light-years across, with two smaller galaxies below it. Large spiral NGC 7769 is seen face-on to the right. Galaxies of the NGC 7771 group are interacting, making repeated close passages that will ultimately result in galaxy-galaxy mergers on a cosmic timescale. The interactions can be traced by distortions in the shape of the galaxies themselves and faint streams of stars created by their mutual gravitational tides. But a clear view of this galaxy group is difficult to come by as the deep image also reveals extensive clouds of foreground dust sweeping across the field of view. The dim, dusty galactic cirrus clouds are known as Integrated Flux Nebulae. The faint IFN reflect starlight from our own Milky Way Galaxy and lie only a few hundred light-years above the galactic plane.
※ 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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