The fate of substructures in cold dark matter haloes

The fate of substructures in cold dark matter haloes
复制标题

冷暗物质晕中亚结构的命运

DOI:
10.1111/j.1365-2966.2009.15333.x
复制
发表时间:
2009
影响因子:
4.8
通讯作者:
Angulo R
Angulo R
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Angulo R

文献摘要

参考文献

被引文献

相似文献

我们使用千年模拟,这是一个大型的高分辨率N体模拟,模拟了Λ冷暗物质宇宙学中的结构演化,研究了大样本暗物质光晕中的亚结构的性质和命运。我们发现,在高质量端,次晕质量函数明显偏离了幂定律。我们还发现,子结构的径向和角分布依赖于次晕质量。特别是,与质量较小的次晕相比,质量较大的次晕的径向集中度较低,其角分布更接近于与宿主晕的自转垂直的方向。我们发现,次光晕之间会发生合并。这些往往是在吸积到主晕之前就已经动态关联的子结构之间。对于大于主晕质量0.001倍的亚晕,亚晕更有可能与中心或主亚晕合并,而不是与另一个比自己大的亚晕合并。对于较低的质量,次光晕-次光晕合并变得与主要次光晕合并的可能性相同。我们的结果对星系性质随环境的变化以及星系形成模型中合并的处理具有重要意义。
We use the Millennium Simulation, a large, high-resolutionN-body simulation of the evolution of structure in a Λ cold dark matter cosmology, to study the properties and fate of substructures within a large sample of dark matter haloes. We find that the subhalo mass function departs significantly from a power law at the high-mass end. We also find that the radial and angular distributions of substructures depend on subhalo mass. In particular, high-mass subhaloes tend to be less radially concentrated and to have angular distributions closer to the direction perpendicular to the spin of the host halo than their less massive counterparts. We find that mergers between subhaloes occur. These tend to be between substructures that were already dynamically associated before accretion into the main halo. For subhaloes larger than 0.001 times the mass of the host halo, it is more likely that the subhalo will merge with the central or main subhalo than with another subhalo larger than itself. For lower masses, subhalo–subhalo mergers become equally likely to mergers with the main subhalo. Our results have implications for the variation of galaxy properties with environment and for the treatment of mergers in galaxy formation models.
DOI: 10.1111/j.1365-2966.2005.09633.x
发表时间: 2004
影响因子: 4.8
作者:
J. Peñarrubia;Andrew J Benson
通讯作者: Andrew J Benson
暗物质晕中子结构的束缚质量
DOI: --
发表时间: 2006
期刊:
影响因子: --
作者:
L. Shaw;J. Weller;J. Ostriker;P. Bode
通讯作者: P. Bode
DOI: 10.1038/nature03597
发表时间: 2005-06-02
期刊: NATURE
影响因子: 64.8
作者:
Springel, V;White, SDM;Pearce, F
通讯作者: Pearce, F
星系、星团和星团晕中子结构的演化——与模拟的比较。
DOI: 10.1111/j.1365-2966.2005.09581.x
发表时间: 2004
影响因子: 4.8
作者:
James E. Taylor;A. Babul
通讯作者: A. Babul