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Cosmic Reionization and Early Star-forming Galaxies: A Joint Analysis of New Constraints from Planck and the Hubble Space Telescope

机译:宇宙电离和早期恒星系:普朗克和哈勃太空望远镜对新约束的联合分析

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摘要

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.
机译:我们讨论了宇宙电离时代的新约束,并测试了负责的大部分电离光子来自高红移恒星形成星系的假设。通过对z≃6-8 QSO,γ射线爆发和预期携带Lyα发射的星系的光谱学研究,在绘制结束电离的图表方面取得了良好的进展。然而,对其持续时间最严格的限制来自汤姆森散射到宇宙微波背景的积分光学深度τ。利用哈勃太空望远镜成像获得的有关遥远星系的丰度和光度分布的最新数据,我们同时匹配了普朗克合作最近报告的降低值τ= 0.066±0.012和银河系介质的中性与6年以内的电离历史≾z≾10,从而减少了非常大量的非常高的红移(z population 10)星系的需求。我们的分析进一步证实了恒星形成的星系主导着电离过程的结论,并且对即将进行的21厘米实验和詹姆斯·韦伯太空望远镜搜索早期星系具有重要意义。

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