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StarGO: A New Method to Identify the Galactic Origins of Halo Stars
Yuan, Zhen1,2,3; Chang, Jiang4; Banerjee, Projjwal2,3; Han, Jiaxin2,3,5; Kang, Xi4; Smith, M. C.1
2018-08-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume863Issue:1Pages:11
Corresponding AuthorYuan, Zhen(sala.yuan@gmail.com)
AbstractWe develop a new method, Stars' Galactic Origin (StarGO), to identify the galactic origins of halo stars using their kinematics. Our method is based on a self-organizing map (SOM), which is one of the most popular unsupervised learning algorithms. STARGO combines SOM with a novel adaptive group identification algorithm with essentially no free parameters. To evaluate our model, we build a synthetic stellar halo from mergers of nine satellites in the Milky Way. We construct the mock catalog by extracting a heliocentric volume of 10 kpc from our simulations and assigning expected observational uncertainties corresponding to bright stars from Gaia DR2 and LAMOST DR5. We compare the results from STARGO against those from a friends-of-friends-based method in the space of orbital energy and angular momentum. We show that STARGO is able to systematically identify more satellites and achieve higher number fraction of identified stars for most of the satellites within the extracted heliocentric volume. When applied to data from Gaia DR2, STARGO will enable us to reveal the origins of the inner stellar halo in unprecedented detail.
KeywordGalaxy: formation Galaxy: halo Galaxy: kinematics and dynamics methods: data analysis
DOI10.3847/1538-4357/aacd0d
WOS KeywordDARK-MATTER HALOES ; DIGITAL SKY SURVEY ; SAGITTARIUS DWARF GALAXY ; MILKY-WAY ; SOLAR NEIGHBORHOOD ; STELLAR HALO ; DATA RELEASE ; GAIA-ERA ; SUBSTRUCTURE ; STREAMS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000441126000012
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21559
Collection中国科学院紫金山天文台
Corresponding AuthorYuan, Zhen
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Shanghai Jiao Tong Univ, Shanghai Key Lab Particle Phys & Cosmol, Dept Astron, Shanghai 200240, Peoples R China
3.Shanghai Jiao Tong Univ, IFSA Collaborat Innovat Ctr, Shanghai 200240, Peoples R China
4.Purple Mt Observ, Partner Grp MPI Astron, 2 West Beijing Rd, Nanjing 210008, Peoples R China
5.Univ Tokyo, UTIAS, Kavli IPMU WPI, Kashiwa, Chiba 2778583, Japan
Recommended Citation
GB/T 7714
Yuan, Zhen,Chang, Jiang,Banerjee, Projjwal,et al. StarGO: A New Method to Identify the Galactic Origins of Halo Stars[J]. ASTROPHYSICAL JOURNAL,2018,863(1):11.
APA Yuan, Zhen,Chang, Jiang,Banerjee, Projjwal,Han, Jiaxin,Kang, Xi,&Smith, M. C..(2018).StarGO: A New Method to Identify the Galactic Origins of Halo Stars.ASTROPHYSICAL JOURNAL,863(1),11.
MLA Yuan, Zhen,et al."StarGO: A New Method to Identify the Galactic Origins of Halo Stars".ASTROPHYSICAL JOURNAL 863.1(2018):11.
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