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arXiv 1209.2682astro-ph.CO
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小尺度密度扰动对暗物质晕轮廓形成的影响

Effect of small scale density perturbations on the formation of dark matter halo profiles

S. V. Pilipenko, A. G. Doroshkevich, V. N. Lukash, E. V. Mikheeva

摘要:

借助一组玩具N体模型,我们研究了小尺度初始扰动对暗晕内部密度分布的影响。我们发现一个显着的平坦的内斜率$α={d \log ρ\over d \log r}$到$α=-0.5$在一定范围内的尺度和振幅的扰动(而在没有这些扰动的情况下,NFW配置文件与$α=-1$再现)。这种效应可能是形成无尖星系晕的原因。

英文摘要:

With help of a set of toy N-body models of dark halo formation we study the impact of small scale initial perturbations on the inner density profiles of haloes. We find a significant flattening of the inner slope $α={d \log ρ\over d \log r}$ to $α=-0.5$ in some range of scales and amplitudes of the perturbations (while in the case of absence of these perturbations the NFW profile with $α=-1$ is reproduced). This effect may be responsible for the formation of cuspless galactic haloes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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