GD-1: The Relic of an Old Metal-poor Globular Cluster

doi:10.3847/1538-4357/aaed29

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	GD-1: The Relic of an Old Metal-poor Globular Cluster
	Li, Guang-Wei 2; Yanny, Brian 1; Wu, Yue 3
刊名	ASTROPHYSICAL JOURNAL
	2018-12-20
卷号	869 期号:2 页码:15
关键词	Galaxy: abundances Galaxy: kinematics and dynamics Galaxy: structure globular clusters: general
ISSN号	0004-637X
DOI	10.3847/1538-4357/aaed29
英文摘要	Combining data from Gaia DR2, SDSS DR14, and LAMOST DR6, we update the fit to model of the properties of the stellar stream GD-1 and find that it has an age of similar to 13 Gyr, [Fe/H] of -2.2 +/- 0.12, and a distance from the Sun of similar to 8 kpc. We tabulate six-dimensional (6D) phase-space fiducial points along the GD-1 stream orbit over a 90 degrees arc. The fitted orbit shows that the stream has an eccentricity e similar to 0.3, perigalacticon of 14.2 kpc, apogalacticon of 27.0 kpc, and inclination i similar to 40 degrees. There is evidence along the arc for four candidate stellar overdensities, one candidate gap, two candidate stellar underdensities, and that the stream is cut off at phi(1) similar to 2 degrees (in the stream-aligned (phi(1), phi(2)) coordinate system of Koposov et al.). The spur originating at phi(1) similar to 40 degrees implies stars were pulled away from the stream trace by an encounter (potentially a dark matter subhalo). The narrowest place (FWHM similar to 44.6 pc) of the GD-1 trace is at (phi(1) , phi(c)(2)) similar to (14 degrees , 0 degrees. 15) which is (178 degrees.18, 52 degrees 19) in (R.A., decl.), where the progenitor is possibly located. We also find six blue horizontal branch and 10 blue stragglers spectroscopic stars in the GD-1 stream.
资助项目	National Natural Science Foundation of China (NFSC)[11673036] ; NSFC[11403056] ; National Development and Reform Commission
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000453821200008
资助机构	National Natural Science Foundation of China (NFSC) ; National Natural Science Foundation of China (NFSC) ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NFSC) ; National Natural Science Foundation of China (NFSC) ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NFSC) ; National Natural Science Foundation of China (NFSC) ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NFSC) ; National Natural Science Foundation of China (NFSC) ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/23921]
专题	中国科学院国家天文台
通讯作者	Li, Guang-Wei
作者单位	1.Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100101, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Li, Guang-Wei,Yanny, Brian,Wu, Yue. GD-1: The Relic of an Old Metal-poor Globular Cluster[J]. ASTROPHYSICAL JOURNAL,2018,869(2):15.
APA	Li, Guang-Wei,Yanny, Brian,&Wu, Yue.(2018).GD-1: The Relic of an Old Metal-poor Globular Cluster.ASTROPHYSICAL JOURNAL,869(2),15.
MLA	Li, Guang-Wei,et al."GD-1: The Relic of an Old Metal-poor Globular Cluster".ASTROPHYSICAL JOURNAL 869.2(2018):15.