The Formation and Evolution of Galactic Disks with APOGEE and the Gaia Survey

doi:10.3847/1538-4357/aac50f

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	The Formation and Evolution of Galactic Disks with APOGEE and the Gaia Survey
	Li,Chengdong 1,2; Zhao,Gang 1,2; Zhai,Meng 1,2; Jia,Yunpeng 1,2
刊名	The Astrophysical Journal
	2018-06-12
卷号	860 期号:1
关键词	Galaxy: disk Galaxy: evolution Galaxy: kinematics and dynamics Galaxy: structure methods: data analysis stars: abundances
ISSN号	0004-637X
DOI	10.3847/1538-4357/aac50f
英文摘要	Abstract We explore the structure and evolutionary history of Galactic disks with Apache Point Observatory Galactic Evolution Experiment data release 13 (DR13 hereafter) and Gaia Tycho-Gaia Astrometric Solution data. We use the [α/M] ratio to allocate stars into particular Galactic components to elucidate the chemical and dynamical properties of the thin and thick disks. The spatial motions of the sample stars are obtained in Galactic Cartesian and cylindrical coordinates. We analyze the abundance trends and metallicity and [α/M] gradients of the thick and thin disks. We confirm the existence of metal-weak thick-disk stars in Galactic disks. A kinematical method is used to select the thin- and thick-disk stars for comparison. We calculate the scale length and scale height of the kinematically and chemically selected thick and thin disks based on the axisymmetric Jeans equation. We conclude that the scale length of the thick disk is approximately equal to that of the thin disk via a kinematical approach. For the chemical selection, this disparity is about 1 kpc. Finally, we get the stellar orbital parameters and try to unveil the formation scenario of the thick disk. We conclude that the gas-rich merger and radial migration are more reasonable formation scenarios for the thick disk.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-860-1-AAC50F
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/21806]
专题	中国科学院国家天文台
作者单位	1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China 2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China; gzhao@nao.cas.cn
推荐引用方式 GB/T 7714	Li,Chengdong,Zhao,Gang,Zhai,Meng,et al. The Formation and Evolution of Galactic Disks with APOGEE and the Gaia Survey[J]. The Astrophysical Journal,2018,860(1).
APA	Li,Chengdong,Zhao,Gang,Zhai,Meng,&Jia,Yunpeng.(2018).The Formation and Evolution of Galactic Disks with APOGEE and the Gaia Survey.The Astrophysical Journal,860(1).
MLA	Li,Chengdong,et al."The Formation and Evolution of Galactic Disks with APOGEE and the Gaia Survey".The Astrophysical Journal 860.1(2018).