The velocity distribution in the solar neighbourhood from the LAMOST pilot survey
文献类型：期刊论文
| 作者 | Xia, Qiran1,2 ; Liu, Chao1,3; Xu, Yan1,3; Mao, Shude1,4; Gao, Shuang1; Hou, Yonghui5; Jin, Ge6; Zhang, Yong5
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2015-03-01 |
| 卷号 | 447期号:3页码:2367-2377 |
| 关键词 | Galaxy: disc Galaxy: kinematics and dynamics solar neighbourhood Galaxy: structure |
| 英文摘要 | We use about 15 000 F/G nearby dwarf stars selected from the LAMOST pilot survey to map the U-V velocity distribution in the solar neighbourhood. An extreme deconvolution algorithm is applied to reconstruct an empirical multi-Gaussian model. In addition to the well-known substructures, e.g. Sirius, Coma Berenices, Hyades-Pleiades overdensities, several new substructures are unveiled. A ripple-like structure from (U, V) = (-120, -5) to (103, -32) km s(-1) is clearly seen in the U-V distribution. This structure seems associated with resonance induced by the Galactic bar, since it is extended in U while having a small dispersion in V at the same time. A ridge structure between (U, V) = (-60, 40) and (-15, 15) km s(-1) is also found. Although similar substructures have been seen in the Hipparcos data, their origin is still unclear. Another compact overdensity is seen at (U, V) = (-102, -24). With this large data sample, we find that the substructure located at V similar to-70 km s(-1) and the Arcturus group are essentially parallel in V, which may indicate that they originate from an unrelaxed disc component perturbed by the rotating bar. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000350273200023 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5741]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 4.Univ Manchester, Ctr Astrophys, Jodrell Bank, Manchester M13 9PL, Lancs, England 5.Chinese Acad Sci, Natl Astron Observ, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R China 6.Univ Sci & Technol China, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xia, Qiran,Liu, Chao,Xu, Yan,et al. The velocity distribution in the solar neighbourhood from the LAMOST pilot survey[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,447(3):2367-2377. |
| APA | Xia, Qiran.,Liu, Chao.,Xu, Yan.,Mao, Shude.,Gao, Shuang.,...&Zhang, Yong.(2015).The velocity distribution in the solar neighbourhood from the LAMOST pilot survey.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,447(3),2367-2377. |
| MLA | Xia, Qiran,et al."The velocity distribution in the solar neighbourhood from the LAMOST pilot survey".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 447.3(2015):2367-2377. |
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来源：国家天文台
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