希克森 44 在獅子座
Hickson 44 in Leo

來源:Jiang Wu|發表日期:2025-04-04
加拿大天文學家保羅-希克森(Paul Hickson)及其同事在掃描天空中的星系時,發現了大約 100 個緊湊的星系群,這些星系群現在被恰當地稱為希克森緊湊星系群。在這個引人入勝的望遠鏡天景中看到的四個突出星系就是這樣一個星系群,即希克森 44 。這個星系群距離銀河系約一億光年,遠遠超過了前景的尖頂銀河系恆星,朝著獅子座的方向。影像中央的兩個螺旋星系是邊緣的 NGC 3190 和 S 形的 NGC 3187 ,前者有獨特的扭曲塵埃通道。它們與明亮的橢圓星系 NGC 3193 (上圖左)一起被稱為 Arp 316 。右下角的螺旋星系是 NGC 3185 ,它是希克森星系群的第 4 個成員。與希克森星系群中的其他星系一樣,這些星系也顯示出扭曲和恆星形成增強的跡象,這是引力拉鋸戰的證據,最終將導致星系在宇宙時間尺度上的合併。合併過程現在已被理解為星系演化過程中的正常部分,包括我們的銀河系。NGC 3190 的直徑約為 75 , 000 光年,估計距離希克森 44 。
原文:Scanning the skies for galaxies, Canadian astronomer Paul Hickson and colleagues identified some 100 compact groups of galaxies, now appropriately called Hickson Compact Groups. The four prominent galaxies seen in this intriguing telescopic skyscape are one such group, Hickson 44. The galaxy group is about 100 million light-years distant, far beyond the spiky foreground Milky Way stars, toward the constellation Leo. The two spiral galaxies in the center of the image are edge-on NGC 3190 with its distinctive, warped dust lanes, and S-shaped NGC 3187. Along with the bright elliptical, NGC 3193 (above and left) they are also known as Arp 316. The spiral toward the lower right corner is NGC 3185, the 4th member of the Hickson group. Like other galaxies in Hickson groups, these show signs of distortion and enhanced star formation, evidence of a gravitational tug of war that will eventually result in galaxy mergers on a cosmic timescale. The merger process is now understood to be a normal part of the evolution of galaxies, including our own Milky Way. For scale, NGC 3190 is about 75,000 light-years across at the estimated distance of Hickson 44.
※ 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。