期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 405, 期 2, 页码 1119-1128出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2010.16514.x
关键词
methods: N-body simulations; methods: numerical; galaxies: formation; galaxies: haloes
资金
- Ministerio de Ciencia e Innovacion (MICINN) in Spain
- Max Planck Gesellschaft
- MICINN [CSD-2007-00050]
- MEC (Spain) [FPA2006-01105, AYA2006-15492-C03]
- ISF [13/08]
We use two simulations performed within the Constrained Local UniversE Simulation (CLUES) project to study both the shape and radial alignment of (the dark matter component of) subhaloes; one of the simulations is a dark matter only model while the other run includes all the relevant gas physics and star formation recipes. We find that the involvement of gas physics does not have a statistically significant effect on either property - at least not for the most massive subhaloes considered in this study. However, we observe in both simulations including and excluding gas dynamics a (pronounced) evolution of the dark matter shapes of subhaloes as well as of the radial alignment signal since infall time. Further, this evolution is different when positioned in the central and outer regions of the host halo today; while subhaloes tend to become more aspherical in the central 50 per cent of their host's virial radius, the radial alignment weakens in the central regime while strengthening in the outer parts. We confirm that this is due to tidal torquing and the fact that subhaloes at pericentre move too fast for the alignment signal to respond.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据