The impact of environment on the dynamical structure of satellite systems
文献类型：期刊论文
| 作者 | Faltenbacher, A.1,2,3 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2010-10-21 |
| 卷号 | 408期号:2页码:1113-1119 |
| 关键词 | methods: numerical galaxies: clusters: general galaxies: haloes darkmatter methods: N-body simulations |
| 英文摘要 | We examine the effects of environment on the dynamical structure of satellite systems based on the Millennium II Simulation. Satellite haloes are defined as subhaloes within the virial radius of a host halo. The satellite sample is restricted to those subhaloes which showed a maximum circular velocity above 30 km s(-1) at the time of accretion. Host halo masses range from 10(11) to 10(14) h(-1)M(circle dot). We compute the satellites' average accretion redshift, z(acc), velocity dispersion, sigma, and velocity anisotropy parameter, beta, utilizing stacked satellite samples of equal-mass hosts at similar background densities. The main results are as follows. (1) On an average, satellites within hosts in high-density environments are accreted earlier (Delta(z) approximate to 0.1) compared to their counterparts at low densities. For host masses above 5 x 10(13) h(-1)M(circle dot) this trend weakens, and may reverse for higher hostmasses. (2) The velocity dispersion of satellites in low-density environments follows that of the host, i.e. no velocity bias is observed for host haloes at low densities independent of host mass. However, for low-mass hosts in high-density environments the velocity dispersion of the satellites can be up to similar to 30 per cent larger than that of the host halo, i.e. the satellites are dynamically hotter than their host haloes. (3) The anisotropy parameter depends on host mass and environment. Satellites of massive hosts show more radially biased velocity distributions. Moreover in low-density environments, satellites have more radially biased velocities (Delta beta greater than or similar to 0.1) as compared to their counterparts in high-density environments. We believe that our approach allows us to predict a similar behaviour for observed satellite galaxy systems. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DARK-MATTER HALOES ; ASSEMBLY BIAS ; MILLENNIUM SIMULATION ; MASS FUNCTIONS ; MERGER RATES ; DEPENDENCE ; GALAXIES ; CLUSTERS ; SUBSTRUCTURE ; GROWTH |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000282639100037 |
| 源URL | [http://119.78.226.72/handle/331011/19973]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Univ Western Cape, Dept Phys, ZA-7535 Cape Town, South Africa 2.Max Planck Inst Astrophys, D-85741 Garching, Germany 3.Shanghai Astron Observ, MPA SHAO Joint Ctr Astrophys Cosmol, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Faltenbacher, A.. The impact of environment on the dynamical structure of satellite systems[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,408(2):1113-1119. |
| APA | Faltenbacher, A..(2010).The impact of environment on the dynamical structure of satellite systems.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,408(2),1113-1119. |
| MLA | Faltenbacher, A.."The impact of environment on the dynamical structure of satellite systems".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 408.2(2010):1113-1119. |
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来源：上海天文台
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