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NASA 美国宇航局的每日一图

发布: 2009-1-12 15:16 | 作者: webmaster | 来源: 本站原创 | 查看: 247次

2008 May 20
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The Perseus Cluster of Galaxies

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英仙座星系团

影像提供与版权: Jean-Charles Cuillandre (CFHT) & Giovanni Anselmi (Coelum Astronomia), Hawaiian Starlight

说明: 这将是我们在天空上发现的最大星体之一。每个模糊的圆点就是一个星系，全部组合起来就是英仙座星系团，也是最靠近我们的星系团之一。这些星系的前景是本银河系的暗淡星光。英仙座星系团中心距离我们约 2.5 亿光年远，中心星系是 NGC 1275，就是上图中左方的大星系。因为NGC 1275 不断吸积掉入的气体与星系，它也是X射线与无线电的发射源。英仙座星系团是双鱼座-英仙座(Pisces-Perseus) 超星系团(supercluster of galaxies)的一部份，视角大小约有15度，包含有1000个星系以上。在 NGC 1275 的距离之下，这个视野大小约有 150 万光年。

Explanation: Here is one of the largest objects that anyone will ever see on the sky. Each of these fuzzy blobs is a galaxy, together making up the Perseus Cluster, one of the closest clusters of galaxies. The cluster is seen through a foreground of faint stars in our own Milky Way Galaxy. Near the cluster center, roughly 250 million light-years away, is the cluster's dominant galaxy NGC 1275, seen above as the large galaxy on the image left. A prodigious source ofx-rays and radio emission, NGC 1275 accretes matter as gas and galaxies fall into it. The Perseus Cluster of Galaxies is part of the Pisces-Perseus supercluster spanning over 15 degrees and containing over 1,000 galaxies. At the distance of NGC 1275, this view covers about 7.5 million light-years.