RED RUNAWAYS: HYPERVELOCITY STARS, HILLS EJECTA, AND OTHER OUTLIERS IN THE F-TO-M STAR REGIME
文献类型：期刊论文
| 作者 | Vickers, John J.1,2; Smith, Martin C.2; Grebel, Eva K.1 |
| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2015-09-01 |
| 卷号 | 150期号:3页码:1 |
| 关键词 | Galaxy: kinematics and dynamics Galaxy: stellar content stars: kinematics and dynamics stars: peculiar stars: statistics |
| 英文摘要 | In this paper we analyze a sample of metal-rich (>-0.8 dex) main sequence stars in the extended solar neighborhood, investigating kinematic outliers from the background population. The data, which are taken from the Sloan Digital Sky Survey, are kinematically profiled as a function of distance from the Galactic plane using full six-dimensional phase space information. Each star is examined in the context of these kinematic profiles and likelihoods are assigned to quantify whether a star matches the underlying profile. Since some of these stars are likely to have been ejected from the disk, we trace back their orbits in order to determine potential ejection radii. We find that objects with low probability (i.e., "outliers") are typically more metal-poor, faster and, most importantly, have a tendency to originate from the inner Galaxy compared to the underlying population. We also compose a sample of stars with velocities exceeding the local escape velocity. Although we do not discount that our sample could be contaminated by objects with spurious proper motions, a number of stars appear to have been ejected from the disk with exceptionally high velocities. Some of these are consistent with being ejected from the spiral arms and hence are a rich resource for further study. Finally we look at objects whose orbits are consistent with them being ejected at high speeds from the Galactic center. Of these objects we find that one, J135855.65 +552538.19, is inconsistent with halo, bulge and disk kinematics and could plausibly have been ejected from the Galactic nucleus via a Hills mechanism. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DIGITAL SKY SURVEY ; SOUTHERN GLOBULAR-CLUSTERS ; MILKY-WAY TOMOGRAPHY ; SPACE VELOCITIES ; DATA RELEASE ; SPIRAL ARMS ; BLACK-HOLE ; GALACTIC-CENTER ; PROPER MOTIONS ; BINARY STARS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000364008100013 |
| 源URL | [http://119.78.226.72/handle/331011/28387]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, D-69120 Heidelberg, Germany 2.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Vickers, John J.,Smith, Martin C.,Grebel, Eva K.. RED RUNAWAYS: HYPERVELOCITY STARS, HILLS EJECTA, AND OTHER OUTLIERS IN THE F-TO-M STAR REGIME[J]. ASTRONOMICAL JOURNAL,2015,150(3):1. |
| APA | Vickers, John J.,Smith, Martin C.,&Grebel, Eva K..(2015).RED RUNAWAYS: HYPERVELOCITY STARS, HILLS EJECTA, AND OTHER OUTLIERS IN THE F-TO-M STAR REGIME.ASTRONOMICAL JOURNAL,150(3),1. |
| MLA | Vickers, John J.,et al."RED RUNAWAYS: HYPERVELOCITY STARS, HILLS EJECTA, AND OTHER OUTLIERS IN THE F-TO-M STAR REGIME".ASTRONOMICAL JOURNAL 150.3(2015):1. |
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来源：上海天文台
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