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Cool start to hydrogen ionization

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Simulations of the cosmos cast doubt on assumptions about the temperature of primordial hydrogen gas when it was ionized by the first stars and galaxies, complicating the interpretation of ongoing observations. See Letter p.197

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Figure 1: A topographic analogy.

NIGEL HICKS/STILL PICTURES/ROBERT HARDING PICTURE LIBRARY

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Authors and Affiliations

  1. Judd D. Bowman is in the School of Earth and Space Exploration, Arizona State University, Tempe, Arizona 85287, USA.,

    Judd D. Bowman

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  1. Judd D. Bowman
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Correspondence to Judd D. Bowman.

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Bowman, J. Cool start to hydrogen ionization. Nature 506, 163–164 (2014). https://doi.org/10.1038/nature13051

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