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arXiv 1407.8192astro-ph.COastro-ph.GA
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在高红移的星系尺度上测试原始非高斯性

Testing primordial non-Gaussianities on galactic scales at high redshift

Mélanie Habouzit, Takahiro Nishimichi, Sébastien Peirani, Gary A. Mamon, Joseph Silk, Jacopo Chevallard

摘要:

原始非高斯性提供了暴胀模型的一个重要检验。虽然普朗克宇宙微波背景实验对星系团尺度上的非高斯性产生了很强的限制,但在星系尺度上仍有相当大的非高斯性空间。我们已经测试了本地的非高斯高红移星系人口的影响,运行5个宇宙学N体模拟到z=6.5。对于这些模拟,我们采用相同的初始相位,以及高斯或尺度相关的非高斯原始波动,所有这些都与普朗克对集群尺度的约束一致。然后,我们使用Behroozi et al.(2013)的晕-恒星质量经验关系为每个晕分配恒星质量。我们的模拟与非高斯初始条件产生晕质量函数,显示出明显的偏离从类似的模拟与高斯初始条件在z>~10。我们观察到一个>0.3 dex的增强低端的晕质量函数,这导致了类似的影响星系恒星质量函数,这应该是测试未来的星系调查在z>10。由于宇宙再电离被认为是由高红移的矮星系驱动的,我们的发现可能对宇宙的再电离历史有影响。

英文摘要:

Primordial non-Gaussianities provide an important test of inflationary models. Although the Planck CMB experiment has produced strong limits on non-Gaussianity on scales of clusters, there is still room for considerable non-Gaussianity on galactic scales. We have tested the effect of local non-Gaussianity on the high redshift galaxy population by running five cosmological N-body simulations down to z=6.5. For these simulations, we adopt the same initial phases, and either Gaussian or scale-dependent non-Gaussian primordial fluctuations, all consistent with the constraints set by Planck on clusters scales. We then assign stellar masses to each halo using the halo - stellar mass empirical relation of Behroozi et al. (2013). Our simulations with non-Gaussian initial conditions produce halo mass functions that show clear departures from those obtained from the analogous simulations with Gaussian initial conditions at z>~10. We observe a >0.3 dex enhancement of the low-end of the halo mass function, which leads to a similar effect on the galaxy stellar mass function, which should be testable with future galaxy surveys at z>10. As cosmic reionization is thought to be driven by dwarf galaxies at high redshift, our findings may have implications for the reionization history of the Universe.

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