Confirming the energy sources of cosmic reionization

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Nature Astronomy | 2022年 / 6卷
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It is unclear what energy sources were responsible for the reionization of hydrogen atoms in the intergalactic medium 13 billion years ago. Measuring the upper limit on the number of ionizing photons produced by quasars has revealed that the contribution of quasars to reionization is negligible, suggesting that galaxies are the major energy sources.
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页码：780 / 781
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