Fading features found in the kinematics of the far-reaching Milky Way stellar halo
文献类型：期刊论文
| 作者 | Bird, Sarah A.1,2; Flynn, Chris3 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2015-09-21 |
| 卷号 | 452期号:3页码:2675-2679 |
| 关键词 | stars: horizontal branch stars: kinematics and dynamics Galaxy: halo Galaxy: kinematics and dynamics galaxies: individual: Milky Way |
| 英文摘要 | We test the long-term kinematical stability of a Galactic stellar halo model, due to Kafle et al. (2012), who study the kinematics of approximately 5000 blue horizontal branch stars in the Sloan Digital Sky Survey. The velocity dispersion sigma and anisotropy parameter beta of the stars have been determined as functions of Galactocentric radius, over the range 6 < R-GC < 25 kpc, and show a strong dip in the anisotropy profile at R-GC similar to 17 kpc. By directly integrating orbits of particles in a 3D model of the Galactic potential with these characteristics, we show that the sigma and beta profiles quickly evolve on a time-scale of a few x 10 Myr whereas the density rho profile remains largely unaffected. We suggest that the feature is therefore transient. The origin of such features in the Galactic halo remains unclear. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | HORIZONTAL-BRANCH STARS ; DIGITAL SKY SURVEY ; GALACTIC HALO ; GALAXY ; DENSITY ; BROKEN ; SDSS ; KPC ; SUBSTRUCTURE ; MODELS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000360854200033 |
| 公开日期 | 2015-11-10 |
| 源URL | [http://119.78.226.72/handle/331011/28256]  |
| 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 Turku, Dept Phys & Astron, Tuorla Observ, FI-21500 Kaarina, Finland 3.Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia |
| 推荐引用方式 GB/T 7714 | Bird, Sarah A.,Flynn, Chris. Fading features found in the kinematics of the far-reaching Milky Way stellar halo[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,452(3):2675-2679. |
| APA | Bird, Sarah A.,&Flynn, Chris.(2015).Fading features found in the kinematics of the far-reaching Milky Way stellar halo.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,452(3),2675-2679. |
| MLA | Bird, Sarah A.,et al."Fading features found in the kinematics of the far-reaching Milky Way stellar halo".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 452.3(2015):2675-2679. |
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来源：上海天文台
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