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arXiv 1606.05930astro-ph.CO
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${\largeτ_e}$对$10^6-10^9M_\odot$标度的物质功率谱约束

Constraint on Matter Power Spectrum on $10^6-10^9M_\odot$ Scales from ${\largeτ_e}$

Renyue Cen

摘要:

在$z=5.7$的再电离的物理丰富的残局进行分析,共同利用观测的Ly $z=5.7$森林,电离光子的平均自由程,星系的光度函数和新的物理见解。我们发现,${\rm τ_e}$的上限提供了一个约束的最小平均自由程(电离光子),这主要是由于矮星系,这反过来又产生了一个新的,但最强的约束$10^6-10^9M_\odot$尺度上的物质功率谱。利用普朗克对${\rm τ_e = 0.055 \pm 0.009}$的最新测量,我们可以在晕质量函数的下限截止质量上设置$(8.9\times 10^6, 3.8\times 10^7, 4.2\times 10^8)M_\odot$的上限,或者在$(1, 1.4, 2.2)σ$置信水平上分别设置暖暗物质粒子质量${\rm m_x \ge (15.1, 9.8, 4.6)keV}$或无菌中微子质量${\rm m_s \ge (161, 90, 33)keV}$的下限。

英文摘要:

An analysis of the physics-rich endgame of reionization at $z=5.7$ is performed, utilizing jointly the observations of the Ly$α$ forest, the mean free path of ionizing photons, the luminosity function of galaxies and new physical insight. We find that an upper limit on ${\rm τ_e}$ provides a constraint on the minimum mean free path (of ionizing photons) that is primarily due to dwarf galaxies, which in turn yields a new and yet the strongest constraint on the matter power spectrum on $10^6-10^9M_\odot$ scales. With the latest Planck measurements of ${\rm τ_e = 0.055 \pm 0.009}$, we can place an upper limit of $(8.9\times 10^6, 3.8\times 10^7, 4.2\times 10^8)M_\odot$ on the lower cutoff mass of the halo mass function, or equivalent a lower limit on warm dark matter particle mass ${\rm m_x \ge (15.1, 9.8, 4.6)keV}$ or on sterile neutrino mass ${\rm m_s \ge (161, 90, 33)keV}$, at $(1, 1.4, 2.2)σ$ confidence level, respectively.

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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