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Mapping the Milky Way with LAMOSTI: method and overview
Liu, Chao1; Xu, Yan1; Wan, Jun-Chen1,2; Wang, Hai-Feng1,2; Carlin, Jeffrey L.3; Deng, Li-Cai1; Newberg, Heidi Jo4; Cao, Zi-Huang1; Hou, Yong-Hui5; Wang, Yue-Fei5; Zhang, Yong5
2017-09-01
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
卷号17期号:9
摘要We present a statistical method to derive the stellar density profiles of the Milky Way from spectroscopic survey data, taking into account selection effects. We assume the selection function, which can be altered during observations and data reductions, of the spectroscopic survey is based on photometric colors and magnitude. Then the underlying selection function for a line-of-sight can be recovered well by comparing the distribution of the spectroscopic stars in a color-magnitude plane with that of the photometric dataset. Subsequently, the stellar density profile along a line-of-sight can be derived from the spectroscopically measured stellar density profile multiplied by the selection function. The method is validated using Galaxia mock data with two different selection functions. We demonstrate that the derived stellar density profiles reconstruct the true ones well not only for the full set of targets, but also for sub-populations selected from the full dataset. Finally, the method is applied to map the density profiles for the Galactic disk and halo, using the LAMOST RGB stars. The Galactic disk extends to about R = 19 kpc, where the disk still contributes about 10% to the total stellar surface density. Beyond this radius, the disk smoothly transitions to the halo without any truncation, bending or breaking. Moreover, no over-density corresponding to the Monoceros ring is found in the Galactic anti-center direction. The disk shows moderate north-south asymmetry at radii larger than 12 kpc. On the other hand, the R-Z tomographic map directly shows that the stellar halo is substantially oblate within a Galactocentric radius of 20 kpc and gradually becomes nearly spherical beyond 30 kpc.
文章类型Article
关键词Methods: Statistical Galaxy: Structure Galaxy: Disk Galaxy: Halo Surveys: Lamost
WOS标题词Science & Technology ; Physical Sciences
资助者Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; National Natural Science Foundation of China(11373032 ; National Natural Science Foundation of China(11373032 ; National Development and Reform Commission ; National Development and Reform Commission ; 11333003) ; 11333003) ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; National Natural Science Foundation of China(11373032 ; National Natural Science Foundation of China(11373032 ; National Development and Reform Commission ; National Development and Reform Commission ; 11333003) ; 11333003)
DOI10.1088/1674-4527/17/9/96
关键词[WOS]TELESCOPE LAMOST ; GALACTIC HALO ; SDSS ; STARS ; TOMOGRAPHY ; SELECTION ; RELEASE ; DENSITY ; GALAXY ; LEGUE
收录类别SCI
语种英语
资助者Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; National Natural Science Foundation of China(11373032 ; National Natural Science Foundation of China(11373032 ; National Development and Reform Commission ; National Development and Reform Commission ; 11333003) ; 11333003) ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; National Natural Science Foundation of China(11373032 ; National Natural Science Foundation of China(11373032 ; National Development and Reform Commission ; National Development and Reform Commission ; 11333003) ; 11333003)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000412778300008
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/20100
专题光学天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.LSST, 933 North Cherry Ave, Tucson, AZ 85721 USA
4.Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA
5.Chinese Acad Sci, Natl Astron Observ, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R China
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Liu, Chao,Xu, Yan,Wan, Jun-Chen,et al. Mapping the Milky Way with LAMOSTI: method and overview[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2017,17(9).
APA Liu, Chao.,Xu, Yan.,Wan, Jun-Chen.,Wang, Hai-Feng.,Carlin, Jeffrey L..,...&Zhang, Yong.(2017).Mapping the Milky Way with LAMOSTI: method and overview.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,17(9).
MLA Liu, Chao,et al."Mapping the Milky Way with LAMOSTI: method and overview".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 17.9(2017).
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