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Red Clump Stars from LAMOST II: the outer disc of the Milky Way
Wan, Jun-Chen1,2; Liu, Chao1; Deng, Li-Cai1
2017-08-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume17Issue:8Pages:8
AbstractWe present stellar density maps of the Galactic outer disc with red clump stars from LAMOST data. These sainples are separated into younger (mean age similar to 2.7 Gyr) and older (mean age similar to 4.6 Gyr) populations so that they can trace the variation of structures with ages in the range of Galactocentric radius R from 9 to 13.5 kpc. We show that scale heights for both of the two populations increase with R and display radial gradients of 48 +/- 6 and 40 +/- 4 pc kpc(-1) for the older and younger populations, respectively. It is evident that flaring occurs in the thin disc populations with a wide range of ages. Moreover, the intensity of flaring does not seem to be significantly related to the age of the thin disc populations. On the other hand, scale lengths of the radial surface density profiles are 4.7 +/- 0.5 kpc for the younger population and 3.4 +/- 0.2 kpc for the older population, meaning that the younger disc population is more radially extended than the older one. Although the fraction of the younger population mildly increases from 28% at R similar to 9 to about 35% at R similar to 13 kpc, the older population is prominent with a fraction of no less than 65% in the outer disc.
KeywordGalaxy: disc Galaxy: evolution Galaxy: structure
Funding OrganizationNational Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission
DOI10.1088/1674-4527/17/8/79
WOS KeywordTELESCOPE LAMOST ; EVOLUTION ; SAGITTARIUS ; PARAMETERS ; DENSITY ; WARPS ; FLARE ; SDSS
Language英语
Funding ProjectNational Key Basic Research Program of China[2014CB845700] ; National Natural Science Foundation of China[11373032] ; National Natural Science Foundation of China[11333003] ; National Development and Reform Commission
Funding OrganizationNational Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Development and Reform Commission ; National Development and Reform Commission
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000416068900003
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/37324
Collection中国科学院国家天文台
Corresponding AuthorWan, Jun-Chen
Affiliation1.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
Recommended Citation
GB/T 7714
Wan, Jun-Chen,Liu, Chao,Deng, Li-Cai. Red Clump Stars from LAMOST II: the outer disc of the Milky Way[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2017,17(8):8.
APA Wan, Jun-Chen,Liu, Chao,&Deng, Li-Cai.(2017).Red Clump Stars from LAMOST II: the outer disc of the Milky Way.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,17(8),8.
MLA Wan, Jun-Chen,et al."Red Clump Stars from LAMOST II: the outer disc of the Milky Way".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 17.8(2017):8.
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