Peaks above the Maxwellian Sea: a new approach to finding substructures in N-body haloes
文献类型：期刊论文
| 作者 | Elahi, Pascal J.1; Thacker, Robert J.2; Widrow, Lawrence M.3 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2011-11-01 |
| 卷号 | 418期号:1页码:320-335 |
| 关键词 | methods: data analysis methods: numerical galaxies: haloes galaxies: structure dark matter |
| 英文摘要 | We describe a new algorithm for finding substructures within dark matter haloes from N-body simulations. The algorithm relies upon the fact that dynamically distinct substructures in a halo will have a local velocity distribution that differs significantly from the mean, i.e. smooth background halo. We characterize the large-scale mean field using a coarsely grained cell-based approach, while a kernel-smoothing process is used to determined the local velocity distribution. Comparing the ratio of these two estimates allows us to identify particles that are strongly clustered in velocity space relative to the background and thus resident in a substructure. From this population of outliers, groups are identified using a Friends-of-Friends-like approach. False positives are rejected using Poisson noise arguments. This approach does not require a search of the full phase-space structure of a halo, a non-trivial task, and is thus computationally advantageous. We apply our algorithm to several test cases and show that it identifies not only subhaloes, bound overdensities in phase space, but can recover tidal streams with a high purity. Our method can even find streams which do not appear significantly overdense either physically or in phase space. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | PHASE-SPACE STRUCTURE ; DARK-MATTER HALOES ; GALAXY FORMATION ; GALACTIC HALO ; MILKY-WAY ; SIMULATION ; SUBHALOES ; ALGORITHM ; PROJECT ; STREAMS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000297045700056 |
| 源URL | [http://119.78.226.72/handle/331011/26414]  |
| 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, Shanghai 200030, Peoples R China 2.St Marys Univ, Dept Phys & Astron, Kingston, ON K7L 3N6, Canada 3.Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON B3H 3C3, Canada |
| 推荐引用方式 GB/T 7714 | Elahi, Pascal J.,Thacker, Robert J.,Widrow, Lawrence M.. Peaks above the Maxwellian Sea: a new approach to finding substructures in N-body haloes[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,418(1):320-335. |
| APA | Elahi, Pascal J.,Thacker, Robert J.,&Widrow, Lawrence M..(2011).Peaks above the Maxwellian Sea: a new approach to finding substructures in N-body haloes.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,418(1),320-335. |
| MLA | Elahi, Pascal J.,et al."Peaks above the Maxwellian Sea: a new approach to finding substructures in N-body haloes".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 418.1(2011):320-335. |
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