KINEMATICS OF THE X-SHAPED MILKY WAY BULGE: EXPECTATIONS FROM A SELF-CONSISTENT N-BODY MODEL
文献类型：期刊论文
| 作者 | Qin, Yujing1,2; Shen, Juntai1 ; Li, Zhao-Yu1; Mao, Shude3,4,5,6; Smith, Martin C.1; Rich, R. Michael7; Kunder, Andrea8; Liu, Chao3
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2015-07-20 |
| 卷号 | 808期号:1页码:1 |
| 关键词 | Galaxy: bulge Galaxy: kinematics and dynamics Galaxy: structure |
| 英文摘要 | We explore the kinematics (both the radial velocity and the proper motion) of the vertical X-shaped feature in the Milky Way with an N-body bar/bulge model. From the solar perspective, the distance distribution of particles is double-peaked in fields passing through the X-shape. The separation and amplitude ratio between the two peaks qualitatively match the observed trends toward the Galactic bulge. We confirm clear signatures of cylindrical rotation in the pattern of mean radial velocity across the bar/bulge region. We also find possible imprints of coherent orbital motion inside the bar structure in the radial velocity distribution along l = 0 degrees, where the near and far sides of the bar/bulge show excesses of approaching and receding particles. The coherent orbital motion is also reflected in the slight displacement of the zero-velocity. line in the mean radial velocity. and the displacement of the maximum/minimum in the mean longitudinal proper motion across the bulge region. We find some degree of anisotropy in the stellar velocity within the X-shape, but the underlying orbital family of the X-shape cannot be clearly distinguished. Two potential applications of the X-shape in previous literature are tested, i.e., bulge rotation and Galactic center (GC) measurements. We find that the proper-motion difference between the two sides of the X-shape can be used to estimate the mean azimuthal streaming motion of the bulge, but not the pattern speed of the bar. We also demonstrate that the GC can be located with the X-shape, but the accuracy depends on the fitting scheme, the number of fields, and their latitudinal coverage. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | GALACTIC BULGE ; RED CLUMP ; CYLINDRICAL ROTATION ; STELLAR KINEMATICS ; BARRED GALAXIES ; PROPER MOTIONS ; GAS-DYNAMICS ; PHASE-SPACE ; BOXY-PEANUT ; BARS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000359062500075 |
| 源URL | [http://119.78.226.72/handle/331011/28211]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 4.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China 5.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China 6.Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England 7.Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA 8.Leibniz Inst Astrophys Potsdam AIP, D-14482 Potsdam, Germany |
| 推荐引用方式 GB/T 7714 | Qin, Yujing,Shen, Juntai,Li, Zhao-Yu,et al. KINEMATICS OF THE X-SHAPED MILKY WAY BULGE: EXPECTATIONS FROM A SELF-CONSISTENT N-BODY MODEL[J]. ASTROPHYSICAL JOURNAL,2015,808(1):1. |
| APA | Qin, Yujing.,Shen, Juntai.,Li, Zhao-Yu.,Mao, Shude.,Smith, Martin C..,...&Liu, Chao.(2015).KINEMATICS OF THE X-SHAPED MILKY WAY BULGE: EXPECTATIONS FROM A SELF-CONSISTENT N-BODY MODEL.ASTROPHYSICAL JOURNAL,808(1),1. |
| MLA | Qin, Yujing,et al."KINEMATICS OF THE X-SHAPED MILKY WAY BULGE: EXPECTATIONS FROM A SELF-CONSISTENT N-BODY MODEL".ASTROPHYSICAL JOURNAL 808.1(2015):1. |
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来源：上海天文台
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