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双城记--星系并合和星系对
A tale of two galaxies--galaxy mergers and galaxy pairs
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摘要: 在重子世界中，星系是宇宙构成的砖块，但是星系在宇宙中的分布却不是随机的。在大尺度上，星系的分布是网状的；在小尺度上，星系往往也会成对存在，比如本地星系群中的银河系和仙女座大星云。星系对最终会发生并合，而这个并合过程是星系增长的主要途径之一。对星系对进行的观测研究能够帮助人们理解星系的相互作用和增长过程。文章重点介绍了现代星系巡天中对星系对进行的观测，特别是中国的重大科学工程郭守敬望远镜在其中所发挥的作用。Abstract: Galaxies are building blocks of the Universe. However, their distribution is not random. On a large scale, they have a net-like distribution, but on a small scale they form pairs, like our Milky Way and the Andromeda galaxy. Galaxy pairs finally merge into one system. Merg-ing is one of the most important approaches for galaxies to assemble mass, and research on galaxy pairs can help us understand galaxy interaction and mass assembly. This paper focuses on the ob-servation of galaxy pairs in modern astronomical surveys and the important role played by the data collected by the Guo Shou-Jing telescope (LAMOST) in the study of galaxy pairs.
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