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The dependence of dark halo clustering on formation epoch and concentration parameter
文献类型：期刊论文
| 作者 | Jing, Y. P.; Suto, Yasushi; Mo, H. J. |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2007-03-10 |
| 卷号 | 657期号:2页码:664-668 |
| 关键词 | cosmology : theory dark matter galaxies : formation gravitational lensing |
| 英文摘要 | We examine the age dependence of dark matter halo clustering at an unprecedented accuracy using a set of seven high-resolution cosmological simulations, each with N = 1024(3) particles. We measure the bias parameters for halos over a large mass range using the cross-power-spectrum method that can effectively suppress the random noise, even in the sparse sampling of the most massive halos. This enables us to find, for the first time, that younger halos are more strongly clustered than older ones for halo masses M > 10M(*), where M-* is the characteristic nonlinear mass scale. For M < M-*, our results confirm the previous finding of Gao et al. that older halos are clustered more strongly than the younger ones. We also study the halo bias as a function of halo concentration, and find that the concentration dependence is weaker than the age dependence for M < M-*, but stronger for M greater than or similar to 50M(*). The accurate and robust measurement of the age dependences of halo bias points to a limitation of the simple excursion-set theory, which predicts that the formation and structure of a halo of given mass is independent of its environment. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | N-BODY SIMULATIONS ; MATTER HALOES ; GALAXY FORMATION ; HIERARCHICAL-MODELS ; DENSITY PROFILES ; MERGER RATES ; MASS ; BIAS ; OCCUPATION ; EVOLUTION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000244928500002 |
| 源URL | [http://119.78.226.72/handle/331011/19456]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Shanghai Astron Observ, Shanghai, Peoples R China 2.Univ Tokyo, Dept Phys, Sch Sci, Tokyo, Japan 3.Univ Tokyo, Res Ctr Early Universe, Sch Sci, Tokyo, Japan 4.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA |
| 推荐引用方式 GB/T 7714 | Jing, Y. P.,Suto, Yasushi,Mo, H. J.. The dependence of dark halo clustering on formation epoch and concentration parameter[J]. ASTROPHYSICAL JOURNAL,2007,657(2):664-668. |
| APA | Jing, Y. P.,Suto, Yasushi,&Mo, H. J..(2007).The dependence of dark halo clustering on formation epoch and concentration parameter.ASTROPHYSICAL JOURNAL,657(2),664-668. |
| MLA | Jing, Y. P.,et al."The dependence of dark halo clustering on formation epoch and concentration parameter".ASTROPHYSICAL JOURNAL 657.2(2007):664-668. |
入库方式： OAI收割
来源：上海天文台
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