Copyright:Rogelio
Bernal Andreo
原文:
Well over a thousand galaxies are known members of the Virgo Cluster, the closest large cluster of galaxies to our own local group. In fact, the galaxy cluster is difficult to appreciate all at once because it covers such a large area on the sky. This careful wide-field mosaic of telescopic images clearly records the central region of the Virgo Cluster through faint foreground dust clouds lingering above the plane of our own Milky Way galaxy. The cluster’s dominant giant elliptical galaxy M87, is just below and to the left of the frame center. To the right of M87 is a string of galaxies known as Markarian’s Chain. A closer examination of the image will reveal many Virgo cluster member galaxies as small fuzzy patches. Sliding your cursor over the image will label the larger galaxies using NGC catalog designations. Galaxies are also shown with Messier catalog numbers, including M84, M86, and prominent colorful spirals M88, M90, and M91. On average, Virgo Cluster galaxies are measured to be about 48 million light-years away. The Virgo Cluster distance has been used to give an important determination of the Hubble Constant and the scale of the Universe. Follow APOD on: Facebook, Google Plus, or Twitter
中文翻譯:
位於我們本地星系群附近的維爾戈星系團 (Virgo Cluster) 擁有超過千個已知的星系成員。由於這個星系團的範圍覆蓋了天空的一大片區域，因此難以一覽無遺。這幅精心制作的廣域馬賽克天文圖像清晰地記錄了維爾戈星系團的中心區域，並可見於我們銀河系 (Milky Way) 平面的前景微弱塵埃雲層。星系團的主導巨型橢圓星系 M87 就位於畫面中心的左下方。在 M87 的右側是一串名為馬卡良鏈 (Markarian’s Chain) 的星系。仔細觀察這幅圖像，可以看到許多維爾戈星系團成員星系，呈現為小而模糊的斑點。將鼠標滑過圖像可以標記出較大的星系，包括 NGC 目錄的指定名稱。此外，還可以看到另一些星系，如梅西耶 (Messier) 目錄編號的 M84、M86，以及著名的多彩螺旋星系 M88、M90 和 M91。平均來說，維爾戈星系團的星系距離我們約 4800 萬光年。這一距離數據對於推算哈勃常數 (Hubble Constant) 和宇宙的尺度來說至關重要。
#維爾戈星系團 #VirgoCluster #M87 #馬卡良鏈 #MarkariansChain #銀河系 #MilkyWay #天文學 #Astronomy #哈勃常數 #HubbleConstant #宇宙 #Universe #星系 #Galaxies #梅西耶 #Messier #NGC
來源:NASA每日圖片
