Arp 78：白羊座的特殊星系
(原标题: Arp 78: Peculiar Galaxy in Aries)
2023-02-23
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奇特的螺旋星系Arp 78被发现在头部强星座白羊座的边界内。在我们银河系的恒星和星云之外大约1亿光年的地方，这个巨大的岛宇宙横跨20万光年。它也被称为NGC 772，在这幅详细的宇宙肖像中，它有一个突出的外旋臂。沿着广阔的尘埃带和年轻的蓝色星团，Arp 78过度发展的螺旋臂被星系尺度的引力潮汐泵起来。它与最明亮的伴星星系——更紧凑的NGC 770——的相互作用可能是罪魁祸首。NGC 770位于大螺旋星系的上方和右侧。深望远镜曝光显示，ngc770镶嵌在暗淡的恒星流中，其模糊的椭圆形外观与银河系前景中带有黄色调的尖尖恒星形成了鲜明的对比。
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Peculiar spiral galaxy Arp 78 is found within the boundaries of the head strong constellation Aries. Some 100 million light-years beyond the stars and nebulae of our Milky Way galaxy, the island universe is an enormous 200,000 light-years across. Also known as NGC 772, it sports a prominent, outer spiral arm in this detailed cosmic portrait. Tracking along sweeping dust lanes and lined with young blue star clusters, Arp 78's overdeveloped spiral arm is pumped-up by galactic-scale gravitational tides. Interactions with its brightest companion galaxy, the more compact NGC 770 seen above and right of the larger spiral, are likely responsible. Embedded in faint star streams revealed in the deep telescopic exposure, NGC 770's fuzzy, elliptical appearance contrasts nicely with spiky foreground Milky Way stars in matching yellowish hues.
© Josep Drudis