The Local Spiral Arm in the LAMOST-Gaia Common Stars?
文献类型：期刊论文
| 作者 | Liu, Chao1 ; Wang, You-Gang2; Shen, Juntai3; Li, Zhao-Yu3; Qin, Yu-Jing3; Hou, Yonghui; Wang, Yuefei4; Zhang, Yong4; Cao, Zihuang1; Wu, Yue1
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| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
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| 出版日期 | 2017-01-20 |
| 卷号 | 835期号:1 |
| 关键词 | Galaxy: disk Galaxy: kinematics and dynamics Galaxy: structure |
| 英文摘要 | Using the LAMOST-Gaia common stars, we demonstrate that the in-plane velocity fields for the nearby young stars are significantly different from those for the old ones. For the young stars, the probably perturbed velocities that are similar to the old population are mostly removed from the velocity maps in the X-Y plane. The residual velocity field shows that the young stars consistently move along Y with faster v(phi) at the trailing side of the local arm, while at the leading side, they move slower in the azimuth direction. At both sides, on average the young stars move inward with a v(R) of -5 similar to -3 km s(-1). The divergence of the velocity in the Y direction implies that the young stars are associated with a density wave near the local arm. We therefore suggest that the young stars may reflect the formation of the local spiral arm by correlating themselves with a density wave. The range of the age for the young stars is around 2 Gyr, which is sensible since the transient spiral arm can persist for that long. We also point out that alternative explanations of the peculiar velocity field for the young population cannot be ruled out if solely using this observed data. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | MILKY-WAY ; VELOCITY DISTRIBUTION ; STELLAR KINEMATICS ; SOLAR NEIGHBORHOOD ; GALACTIC DISK ; DENSITY WAVES ; GALAXY ; RAVE ; GAS ; BAR |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000394612700005 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8258]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Key Lab Computat Astrophys, Natl Astron Observ, Beijing 100012, Peoples R China 3.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 4.Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Natl Astron Observ, Nanjing 210042, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Chao,Wang, You-Gang,Shen, Juntai,et al. The Local Spiral Arm in the LAMOST-Gaia Common Stars?[J]. ASTROPHYSICAL JOURNAL LETTERS,2017,835(1). |
| APA | Liu, Chao.,Wang, You-Gang.,Shen, Juntai.,Li, Zhao-Yu.,Qin, Yu-Jing.,...&Wu, Yue.(2017).The Local Spiral Arm in the LAMOST-Gaia Common Stars?.ASTROPHYSICAL JOURNAL LETTERS,835(1). |
| MLA | Liu, Chao,et al."The Local Spiral Arm in the LAMOST-Gaia Common Stars?".ASTROPHYSICAL JOURNAL LETTERS 835.1(2017). |
入库方式： OAI收割
来源：国家天文台
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