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Precession of the Sagittarius stream
文献类型：期刊论文
| 作者 | Belokurov, V.1; Koposov, S. E.1,2; Evans, N. W.1; Penarrubia, J.1,3; Irwin, M. J.1; Smith, M. C.4; Lewis, G. F.1,5; Gieles, M.1,6; Wilkinson, M. I.7; Gilmore, G.1 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2014 |
| 卷号 | 437期号:1页码:116-131 |
| 关键词 | blue stragglers stars: carbon stars: horizontal branch Galaxy: fundamental parameters Galaxy: halo Galaxy: kinematics and dynamics |
| 英文摘要 | Using a variety of stellar tracers - blue horizontal branch stars, main-sequence turn-off stars and red giants - we follow the path of the Sagittarius (Sgr) stream across the sky in Sloan Digital Sky Survey data. Our study presents new Sgr debris detections, accurate distances and line-of-sight velocities that together help to shed new light on the puzzle of the Sgr tails. For both the leading and the trailing tails, we trace the points of their maximal extent, or apocentric distances, and find that they lie at R-L = 47.8 +/- 0.5 kpc and R-T = 102.5 +/- 2.5 kpc, respectively. The angular difference between the apocentres is 93.degrees 2 +/- 3.degrees 5, which is smaller than predicted for logarithmic haloes. Such differential orbital precession can be made consistent with models of the Milky Way in which the dark matter density falls more quickly with radius. However, currently, no existing Sgr disruption simulation can explain the entirety of the observational data. Based on its position and radial velocity, we show that the unusually large globular cluster NGC 2419 can be associated with the Sgr trailing stream. We measure the precession of the orbital plane of the Sgr debris in the Milky Way potential and show that, surprisingly, Sgr debris in the primary (brighter) tails evolves differently from the secondary (fainter) tails, both in the north and the south. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | HALO GLOBULAR-CLUSTER ; SKY SURVEY VIEW ; COMPACT STELLAR-SYSTEMS ; BLUE HORIZONTAL-BRANCH ; MILKY-WAY ; DWARF GALAXY ; NGC 2419 ; CHEMICAL INVENTORY ; TIDAL STREAMS ; GALACTIC HALO |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000328373000031 |
| 源URL | [http://119.78.226.72/handle/331011/18188]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England 2.Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119991, Russia 3.Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland 4.Shanghai Astron Observ, Shanghai 200030, Peoples R China 5.Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia 6.Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England 7.Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England 8.Univ Arizona, Steward Observ, Tucson, AZ 85721 USA |
| 推荐引用方式 GB/T 7714 | Belokurov, V.,Koposov, S. E.,Evans, N. W.,et al. Precession of the Sagittarius stream[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,437(1):116-131. |
| APA | Belokurov, V..,Koposov, S. E..,Evans, N. W..,Penarrubia, J..,Irwin, M. J..,...&Niederste-Ostholt, M..(2014).Precession of the Sagittarius stream.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,437(1),116-131. |
| MLA | Belokurov, V.,et al."Precession of the Sagittarius stream".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 437.1(2014):116-131. |
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