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arXiv 0904.0175astro-ph.CO
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局域宇宙中微小空洞的大小:支持暖暗物质模型的一个论点?

The sizes of mini-voids in the local universe: an argument in favor of a warm dark matter model?

A. V. Tikhonov, S. Gottloeber, G. Yepes, Y. Hoffman

摘要:

使用高分辨率的模拟内的冷和暖暗物质模型,我们研究了小尺度结构的演变在本地体积,一个球的8兆秒差距半径周围的本地组。我们比较观察到的光谱的微型空洞的局部体积与微型空洞的模拟确定的光谱。我们表明,\LWDM模型可以很容易地解释所观察到的光谱的微小空洞和存在的低质量星系中观察到的本地体积,提供的所有晕的圆速度大于20公里/秒的主机星系。相反,在LCDM模型中,模拟的微空洞的分布反映了观测到的最大圆速度大于35 km/s的晕。这一假设与我们本宇宙中圆周速度低至20 km/s的星系的观测结果相矛盾。LWDM模型的一个潜在问题可能是气体可以有效地光蒸发的晕的后期形成。因此,恒星的形成受到抑制,低质量的晕可能根本没有任何星系。

英文摘要:

Using high-resolution simulations within the Cold and Warm Dark Matter models we study the evolution of small scale structure in the Local Volume, a sphere of 8 Mpc radius around the Local Group. We compare the observed spectrum of mini-voids in the Local Volume with the spectrum of mini-voids determined from the simulations. We show that the \LWDM model can easily explain both the observed spectrum of mini-voids and the presence of low-mass galaxies observed in the Local Volume, provided that all haloes with circular velocities greater than 20 km/s host galaxies. On the contrary within the LCDM model the distribution of the simulated mini-voids reflects the observed one if haloes with maximal circular velocities larger than 35 km/s host galaxies. This assumption is in contradiction with observations of galaxies with circular velocities as low as 20 km/s in our Local Universe. A potential problem of the LWDM model could be the late formation of the haloes in which the gas can be efficiently photo-evaporated. Thus star formation is suppressed and low-mass haloes might not host any galaxy at all.

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