史蒂芬五重奏的
(原标题: Stephan's Quintet)
2021-12-18
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这是第一个被发现的致密星系群，斯蒂芬五重奏在这张引人注目的图像中是有特色的，它是用哈勃遗产档案中大量的数据构建的。大约在3亿光年之外，这5个星系中只有4个实际上被锁在了反复近距离接触的宇宙之舞中。不过，那些与众不同的人很容易被发现。相互作用的星系NGC 7319、7318A、7318B和7317整体呈淡黄色。它们也往往有扭曲的环和尾巴，在破坏性引力潮汐的影响下生长。但以蓝色为主的星系NGC 7320距离我们更近，只有4000万光年远，不属于相互作用的星系群。斯蒂芬五重奏位于飞马座的边界内。在相互作用的星系四重奏的估计距离上，这个视场的跨度约为50万光年。但在这片区域的上方和右侧，天文学家可以识别出另一个星系NGC 7320C，它距离我们也有3亿光年。包括它将使相互作用的四重奏恢复到五重奏的地位。
查看原文解释
The first identified compact galaxy group, Stephan's Quintet is featured in this eye-catching image constructed with data drawn from the extensive Hubble Legacy Archive. About 300 million light-years away, only four of these five galaxies are actually locked in a cosmic dance of repeated close encounters. The odd man out is easy to spot, though. The interacting galaxies, NGC 7319, 7318A, 7318B, and 7317 have an overall yellowish cast. They also tend to have distorted loops and tails, grown under the influence of disruptive gravitational tides. But the predominantly bluish galaxy, NGC 7320, is closer, just 40 million light-years distant, and isn't part of the interacting group. Stephan's Quintet lies within the boundaries of the high flying constellation Pegasus. At the estimated distance of the quartet of interacting galaxies, this field of view spans about 500,000 light-years. But moving just beyond this field, up and to the right, astronomers can identify another galaxy, NGC 7320C, that is also 300 million light-years distant. Including it would bring the interacting quartet back up to quintet status.