摘要
冷暗物质模型预言银河系是由许多小的矮星系吸积和并合形成的,矮星系吸积和并合的过程会在银河系留下星流等子结构,通过对这些子结构进行探测和研究有助于更好地还原银河系形成历史。简要回顾关于银河系吸积和并合起源的研究历史,总结了星流早期、中期、晚期在位置空间、运动学空间和化学空间的不同特点和分布;详细介绍了从这三个不同相空间探测和研究星流等子结构的方法。介绍了对两个典型子结构的研究结果,对这两个星流的详细研究有助于研究银河系的结构及其吸积和并合起源;此外给出了目前探测到的星流等子结构的列表。最后结合Gaia,对LAMOST Ⅱ期工程、CSST以及Subaru/PFS等光谱巡天项目开展银河系吸积和并合历史研究的前景进行了展望。
The cold dark matter model predicts that the Milky Way is formed by the accretion and merger of many smaller dwarf galaxies.The process of accretion and merger will leave stellar streams and other substructures in the Milky Way,which are the debris of the dwarf galaxies.To better understand the formation history of the Milky Way,it is helpful to detect and study these substructures.In this paper,we give a brief review of the history of studies on the sources of the accretion of the Milky Way,summarize the different distributions of stellar streams in the spatial coherence,clustered in velocity space and chemical group in the early,middle,and late stages respectively.We introduce the method and history of detection,research of stellar streams,and the substructures from these threephase spaces in detail.Then we introduce the studies of two typical substructures.The detailed studies of these two substructures have greatly improved our understanding of the formation history and structure evolution of the Milky Way.A list of sub-structures such as the stellar streams detected up to now is also provided.Finally,we give the prospects of using LAMOST II project,CSST survey,Subaru/PFS,etc.,in conjunction with Gaia to carry out studies on the accretion and merger history of the Milky Way.
作者
张子键
赵刚
ZHANG Zi-Jian;ZHAO Gang(Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China;School of Astronomy and Space Science,Nanjing University,Nanjing 210093,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《天文学进展》
CSCD
北大核心
2022年第4期506-534,共29页
Progress In Astronomy
基金
国家自然科学基金(11988101,11890694)
国家重点研发计划项目(2019YFA0405500)。
关键词
银河系演化
吸积
并合
星流
Milky Way evolution
accretion
merger
stellar stream
