RESONANT ORBITS AND THE HIGH VELOCITY PEAKS TOWARD THE BULGE
文献类型：期刊论文
| 作者 | Molloy, Matthew1; Smith, Martin C.2; Evans, N. Wyn3; Shen, Juntai2
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2015-10-20 |
| 卷号 | 812期号:2页码:1 |
| 关键词 | galaxies: bulges galaxies: evolution galaxies: kinematics and dynamics Galaxy: bulge Galaxy: evolution Galaxy: kinematics and dynamics |
| 英文摘要 | We extract the resonant orbits from an N-body bar that is a good representation of the Milky Way, using the method recently introduced by Molloy et al. By decomposing the bar into its constituent orbit families, we show that they are intimately connected to the boxy-peanut shape of the density. We highlight the imprint due solely to resonant orbits on the kinematic landscape toward the Galactic center. The resonant orbits are shown to have distinct kinematic features and may be used to explain the cold velocity peak seen in the Apache Point Observatory Galactic Evolution Experiment commissioning data. We show that high velocity peaks are a natural consequence of the motions of stars in the 2:1 orbit family and that stars on other higher order resonances can contribute to the peaks. The locations of the peaks vary with bar angle and, with the tacit assumption that the observed peaks are due to the 2:1 family, we find that the locations of the high velocity peaks correspond to bar angles in the range 10 degrees less than or similar to theta(bar) less than or similar to 25 degrees. However, some important questions about the nature of the peaks remain, such as their apparent absence in other surveys of the Bulge and the deviations from symmetry between equivalent fields in the north and south. We show that the absence of a peak in surveys at higher latitudes is likely due to the combination of a less prominent peak and a lower number density of bar supporting orbits at these latitudes. |
| 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 BULGE ; SELF-CONSISTENT MODELS ; RED CLUMP GIANTS ; GALACTIC BULGE ; BARRED GALAXIES ; BOXY BULGE ; LONG BAR ; OGLE-III ; KINEMATICS ; STELLAR |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000365206600058 |
| 公开日期 | 2016-01-19 |
| 源URL | [http://119.78.226.72/handle/331011/28396]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 3.Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England |
| 推荐引用方式 GB/T 7714 | Molloy, Matthew,Smith, Martin C.,Evans, N. Wyn,et al. RESONANT ORBITS AND THE HIGH VELOCITY PEAKS TOWARD THE BULGE[J]. ASTROPHYSICAL JOURNAL,2015,812(2):1. |
| APA | Molloy, Matthew,Smith, Martin C.,Evans, N. Wyn,&Shen, Juntai.(2015).RESONANT ORBITS AND THE HIGH VELOCITY PEAKS TOWARD THE BULGE.ASTROPHYSICAL JOURNAL,812(2),1. |
| MLA | Molloy, Matthew,et al."RESONANT ORBITS AND THE HIGH VELOCITY PEAKS TOWARD THE BULGE".ASTROPHYSICAL JOURNAL 812.2(2015):1. |
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来源：上海天文台
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