On the metallicity gradients of the Galactic disk as revealed by LSS-GAC red clump stars

	On the metallicity gradients of the Galactic disk as revealed by LSS-GAC red clump stars
	Huang, Yang 1; Liu, Xiao-Wei 1,2; Zhang, Hua-Wei 1,2; Yuan, Hai-Bo 2; Xiang, Mao-Sheng 1; Chen, Bing-Qiu 2; Ren, Juan-Juan 1; Sun, Ning-Chen 1; Wang, Chun 1; Zhang, Yong 3
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2015-08-01
卷号	15 期号:8 页码:1240-1263
关键词	Galaxy: abundances Galaxy: disk Galaxy: evolution Galaxy: formation techniques: spectroscopic
英文摘要	Using a sample of over 70 000 red clump (RC) stars with 5%-10% distance accuracy selected from the LAMOST Spectroscopic Survey of the Galactic Anti-center (LSS-GAC), we study the radial and vertical gradients of the Galactic disk(s) mainly in the anti-center direction, covering a significant volume of the disk in the range of projected Galactocentric radius 7 <= R-GC <= 14 kpc and height from the Galactic midplane 0 <= vertical bar Z vertical bar <= 3 kpc. Our analysis shows that both the radial and vertical metallicity gradients are negative across much of the volume of the disk that is probed, and they exhibit significant spatial variations. Near the solar circle (7 <= R-GC <= 11.5 kpc), the radial gradient has a moderately steep, negative slope of -0.08 dex kpc(-1) near the midplane (vertical bar Z vertical bar < 0. 1 kpc), and the slope flattens with increasing vertical bar Z vertical bar. In the outer disk (11.5 < R-GC <= 14 kpc), the radial gradients have an essentially constant, much less steep slope of -0.01 dex kpc(-1) at all heights above the plane, suggesting that the outer disk may have experienced an evolutionary path different from that of the inner disk. The vertical gradients are found to flatten largely with increasing R-GC. However, the vertical gradient of the lower disk (0 <= vertical bar Z vertical bar <= 1 kpc) is found to flatten with R-GC quicker than that of the upper disk (1 < vertical bar Z vertical bar <= 3 kpc). Our results should provide strong constraints on the theory of disk formation and evolution, as well as the underlying physical processes that shape the disk (e.g. gas flows, radial migration, and internal and external perturbations).
收录类别	SCI
语种	英语
WOS记录号	WOS:000360553400010
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5604]
专题	国家天文台_光学天文研究部
作者单位	1.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Natl Astron Observ, Nanjing 210042, Jiangsu, Peoples R China 4.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Huang, Yang,Liu, Xiao-Wei,Zhang, Hua-Wei,et al. On the metallicity gradients of the Galactic disk as revealed by LSS-GAC red clump stars[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2015,15(8):1240-1263.
APA	Huang, Yang.,Liu, Xiao-Wei.,Zhang, Hua-Wei.,Yuan, Hai-Bo.,Xiang, Mao-Sheng.,...&Yang, Ming.(2015).On the metallicity gradients of the Galactic disk as revealed by LSS-GAC red clump stars.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,15(8),1240-1263.
MLA	Huang, Yang,et al."On the metallicity gradients of the Galactic disk as revealed by LSS-GAC red clump stars".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 15.8(2015):1240-1263.