COSMIC REIONIZATION AND EARLY STAR-FORMING GALAXIES: A JOINT ANALYSIS OF NEW CONSTRAINTS FROM PLANCK AND THE HUBBLE SPACE TELESCOPE
COSMIC REIONIZATION AND EARLY STAR-FORMING GALAXIES: A JOINT ANALYSIS OF NEW CONSTRAINTS FROM PLANCK AND THE HUBBLE SPACE TELESCOPE
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DOI：
10.1088/2041-8205/802/2/l19
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发表时间：
2015-02
期刊：
影响因子：
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通讯作者：
B. Robertson;R. Ellis;S. Furlanetto;J. Dunlop
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作者：
B. Robertson;R. Ellis;S. Furlanetto;J. Dunlop
我们讨论了宇宙再电离时代的新限制，并测试假设，即大多数电离光子负责产生高红移恒星形成星系。通过对Z_（10）的光谱研究，在绘制再电离终点图方面取得了很好的进展。6-8类星体、伽玛射线暴和预期有Lyα发射的星系。然而，对它的持续时间最严格的限制来自汤姆逊散射到宇宙微波背景的积分光学深度τ。利用哈勃空间望远镜观测到的遥远星系丰度和光度分布的最新数据，同时匹配了约化值τ = 0.066 ± 0.012？>最近报告的普朗克合作和不断发展的中性星系际介质的再电离历史内6赫兹10？>，从而减少了对大量非常高红移（z = 10？>）星系。我们的分析加强了这样的结论，即恒星形成的星系占主导地位的再电离过程，并具有重要的意义，即将到来的21厘米的实验和搜索早期星系的詹姆斯韦伯太空望远镜。
We discuss new constraints on the epoch of cosmic reionization and test the assumption that most of the ionizing photons responsible arose from high-redshift star-forming galaxies. Good progress has been made in charting the end of reionization through spectroscopic studies of z ≃ ?> 6–8 QSOs, gamma-ray bursts, and galaxies expected to host Lyα emission. However, the most stringent constraints on its duration have come from the integrated optical depth, τ, of Thomson scattering to the cosmic microwave background. Using the latest data on the abundance and luminosity distribution of distant galaxies from Hubble Space Telescope imaging, we simultaneously match the reduced value τ = 0.066 ± 0.012 ?> recently reported by the Planck collaboration and the evolving neutrality of the intergalactic medium with a reionization history within 6 ≲ z ≲ 10 ?> , thereby reducing the requirement for a significant population of very high redshift ( z ≫ 10 ?> ) galaxies. Our analysis strengthens the conclusion that star-forming galaxies dominated the reionization process and has important implications for upcoming 21 cm experiments and searches for early galaxies with the James Webb Space Telescope.