不規則矮星系 Sextans A
Irregular Dwarf Galaxy Sextans A

來源:Franz Hofmann|發表日期:2025-05-29
大的旋渦星系似乎總是最引人注目的,它們沿著優美、對稱的旋臂,炫耀著年輕、明亮、藍色的星團和粉紅色的恆星形成區。但小星系也會形成恆星,比如不規則的矮星系塞克斯坦 A,它的年輕星團和恆星形成區聚集在一個膠滴形區域,直徑只有 5000 光年。從導航星座塞克斯坦的方向看去,這個小星系距離地球約 450 萬光年。這使它接近本星系群的外圍,本星系群包括大質量螺旋星系仙女座和我們的銀河系。在這個色彩斑斕的六分儀 A 望遠鏡檢視中,較亮的銀河系前景恆星呈現出尖刺狀和淡黃色。
原文:Grand spiral galaxies often seem to get all the attention, flaunting young, bright, blue star clusters and pinkish star forming regions along graceful, symmetric spiral arms. But small galaxies form stars too, like irregular dwarf galaxy Sextans A. Its young star clusters and star forming regions are gathered into a gumdrop-shaped region a mere 5,000 light-years across. Seen toward the navigational constellation Sextans, the small galaxy lies some 4.5 million light-years distant. That puts it near the outskirts of the local group of galaxies, that includes the large, massive spirals Andromeda and our own Milky Way. Brighter Milky Way foreground stars appear spiky and yellowish in this colorful telescopic view of Sextans A.
※ 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。