Arp 78：白羊座的特殊星系

2022年3月24日

Arp 78: Peculiar Galaxy in Aries
Image Credit & License: International Gemini Observatory / NOIRLab / NSF / AURA
Processing: T.A. Rector (Univ. Alaska Anchorage), J. Miller (Gemini Observatory/NOIRLab), M. Zamani & D. de Martin

Explanation: 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 over 100,000 light-years across. Also known as NGC 772, it sports a prominent, outer spiral arm in this detailed cosmic portrait from the large Gemini North telescope near the summit of Maunakea, Hawaii, planet Earth. Tracking along sweeping dust lanes and lined with young blue star clusters, Arp 78’s spiral arm is likely pumped-up by galactic-scale gravitational tidal interactions The close companion galaxy responsible is NGC 770, located off the upper right of this frame. But more distant background galaxies are clearly visible in the cosmic field of view.

Tomorrow’s picture: serpentine protectress

Arp 78：白羊座的特殊星系
影像提供与授权: International Gemini Observatory / NOIRLab / NSF / AURA
影像处理: T.A. Rector (Univ. Alaska Anchorage), J. Miller (Gemini Observatory/NOIRLab), M. Zamani & D. de Martin

说明: 特殊螺旋星系Arp 78在白羊座之内。座落在我们银河系恒星和星云后方约1亿光年远处的这个宇宙岛，跨幅超过100,000光年。在这幅由夏威夷莫纳克亚山顶的大口径北双子望远镜所拍摄之极清晰宇宙影像里，亦名为NGC 772的此星系，带着鲜明的外螺旋臂。上头排列着宽广尘埃带和年轻泛蓝星团的星系Arp 78之螺旋臂，很可能是星系级重力潮汐作用的产物。而造就这些现象的天体，则是位在这幅右上缘之外的邻近伴星系NGC 770。除此之外，在这片宇宙视野里，还可以见到许多遥远的背景星系。

明日的图片: serpentine protectress