arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1005.2502astro-ph.CO
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高红移宇宙结构的形成

Cosmic Structure Formation at High Redshift

Ilian T. Iliev, Kyungjin Ahn, Jun Koda, Paul R. Shapiro, Ue-Li Pen

摘要:

我们提出了一些初步的结果,从一系列非常大的,高分辨率的N体模拟形成的早期非线性结构。我们发现,高z晕质量函数是不一致的Sheth-Tormen质量函数,这往往高估了稀有晕的丰度。这种差异与以前基于较小模拟的结果大致一致。我们还表明,minihaloes的数密度与当地的物质密度,虽然与一个显着的分散,增加红移,minihaloes变得越来越罕见。的平均相关性是在一个简单的分析扩展Press-Schechter模型粗略的协议,但可以不同的2倍,在某些制度。

英文摘要:

We present some preliminary results from a series of extremely large, high-resolution N-body simulations of the formation of early nonlinear structures. We find that the high-z halo mass function is inconsistent with the Sheth-Tormen mass function, which tends to over-estimate the abundance of rare halos. This discrepancy is in rough agreement with previous results based on smaller simulations. We also show that the number density of minihaloes is correlated with local matter density, albeit with a significant scatter that increases with redshift, as minihaloes become increasingly rare. The average correlation is in rough agreement with a simple analytical extended Press-Schechter model, but can differ by up to factor of 2 in some regimes.

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