CHARACTERIZING THE SHARDS OF DISRUPTED MILKY WAY SATELLITES WITH LAMOST
文献类型：期刊论文
| 作者 | Carlin, Jeffrey L.1,2; Liu, Chao3 ; Newberg, Heidi Jo1; Beers, Timothy C.4,5; Deng, Licai3; Guhathakurta, Puragra6; Cao, Zihuang3; Hou, Yonghui7; Wang, Yuefei7; Wu, Yue3
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2016-05-01 |
| 卷号 | 822期号:1 |
| 关键词 | Galaxy: halo Galaxy: stellar content Galaxy: structure stars: kinematics and dynamics surveys |
| 英文摘要 | We derive the fraction of substructure in the Galactic halo using a sample of over 10,000 spectroscopically confirmed halo giant stars from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectroscopic survey. By observing 100 synthetic models along each line of sight with the LAMOST selection function in that sky area, we statistically characterize the expected halo populations. We define as Stellar Halo Accretion Related Debris Structures (SHARDS) any stars in > 3 sigma excesses above the model predictions. We find that at least 10% of the Milky Way (MW) halo stars from LAMOST are part of SHARDS. By running our algorithm on smooth halos observed with the LAMOST selection function, we show that the LAMOST data contain excess substructure over all Galactocentric radii R-GC < 40 kpc, beyond what is expected due to statistical fluctuations and incomplete sampling of a smooth halo. The level of substructure is consistent with the fraction of stars in SHARDS in model halos created entirely from accreted satellites. This work illustrates the potential of vast spectroscopic surveys with high filling factors over large sky areas to recreate the merging history of the MW. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000377154100016 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5339]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA 2.Earlham Coll, Dept Phys & Astron, Richmond, IN 47374 USA 3.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 4.Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA 5.Univ Notre Dame, JINA Ctr Evolut Elements, Notre Dame, IN 46556 USA 6.Univ Calif Santa Cruz, Dept Astron & Astrophys, UCO Lick Observ, Santa Cruz, CA 95064 USA 7.Chinese Acad Sci, Natl Astron Observ, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Carlin, Jeffrey L.,Liu, Chao,Newberg, Heidi Jo,et al. CHARACTERIZING THE SHARDS OF DISRUPTED MILKY WAY SATELLITES WITH LAMOST[J]. ASTROPHYSICAL JOURNAL,2016,822(1). |
| APA | Carlin, Jeffrey L..,Liu, Chao.,Newberg, Heidi Jo.,Beers, Timothy C..,Deng, Licai.,...&Zhang, Yong.(2016).CHARACTERIZING THE SHARDS OF DISRUPTED MILKY WAY SATELLITES WITH LAMOST.ASTROPHYSICAL JOURNAL,822(1). |
| MLA | Carlin, Jeffrey L.,et al."CHARACTERIZING THE SHARDS OF DISRUPTED MILKY WAY SATELLITES WITH LAMOST".ASTROPHYSICAL JOURNAL 822.1(2016). |
入库方式： OAI收割
来源：国家天文台
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