Determining the local dark matter density with LAMOST data
文献类型：期刊论文
| 作者 | Xia, Qiran1,2 ; Liu, Chao1,3; Mao, Shude1,4,5; Song, Yingyi6; Zhang, Lan3,7; Long, R. J.1,5; Zhang, Yong8; Hou, Yonghui8; Wang, Yuefei8; Wu, Yue3
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2016-06-01 |
| 卷号 | 458期号:4页码:3839-3850 |
| 关键词 | Galaxy: disc Galaxy: kinematics and dynamics dark matter |
| 英文摘要 | Measurement of the local dark matter density plays an important role in both Galactic dynamics and dark matter direct detection experiments. However, the estimated values from previous works are far from agreeing with each other. In this work, we provide a well-defined observed sample with 1427 G- and K-type main-sequence stars from the Large Sky Area Multi-Object Fibre Spectroscopic Telescope spectroscopic survey, taking into account selection effects, volume completeness, and the stellar populations. We apply a vertical Jeans equation method containing a single exponential stellar disc, a razor thin gas disc, and a constant,dark matter density distribution to the sample, and obtain a total surface mass density of 78.7(-4.7)(+3.9) M-circle dot pc(-2) up to 1 kpc and a local dark matter density of 0.018 +/- 0.0054 M-circle dot pc(-3). We find that the sampling density (i.e. number of stars per unit volume) of the spectroscopic data contributes to about two-third of the uncertainty in the estimated values. We discuss the effect of the tilt term in the Jeans equation and find it has little impact on our measurement. Other issues, such as a non-equilibrium component due to perturbations and contamination by the thick-disc population, are also discussed. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000375799500040 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5381]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observat, 20A Datun Rd, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Natl Astron Observat, Key Lab Opt Astron, 20A Datun Rd, Beijing 100012, Peoples R China 4.Tsinghua Univ, Dept Phys, Ctr Astrophys, Beijing 10086, Peoples R China 5.Univ Manchester, Sch Phys & Astron, Ctr Astrophys, Jodrell Bank, Oxford Rd, Manchester M13 9PL, Lancs, England 6.Univ Michigan, Dept Astron, 311 West Hall,1085 South Univ Ave, Ann Arbor, MI 48109 USA 7.Dept Astron Chile, Camino EI Observat 1515, Santiago 48109, Chile 8.Chinese Acad Sci, Natl Astron Observat, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xia, Qiran,Liu, Chao,Mao, Shude,et al. Determining the local dark matter density with LAMOST data[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,458(4):3839-3850. |
| APA | Xia, Qiran.,Liu, Chao.,Mao, Shude.,Song, Yingyi.,Zhang, Lan.,...&Wu, Yue.(2016).Determining the local dark matter density with LAMOST data.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,458(4),3839-3850. |
| MLA | Xia, Qiran,et al."Determining the local dark matter density with LAMOST data".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 458.4(2016):3839-3850. |
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来源：国家天文台
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