Definitive upper bound on the negligible contribution of quasars to cosmic reionization

被引:0
作者
Linhua Jiang
Yuanhang Ning
Xiaohui Fan
Luis C. Ho
Bin Luo
Feige Wang
Jin Wu
Xue-Bing Wu
Jinyi Yang
Zhen-Ya Zheng
机构
[1] Peking University,Kavli Institute for Astronomy and Astrophysics
[2] Peking University,Department of Astronomy, School of Physics
[3] University of Arizona,Steward Observatory
[4] Nanjing University,School of Astronomy and Space Science
[5] Shanghai Astronomical Observatory,undefined
来源
Nature Astronomy | 2022年 / 6卷
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摘要
Cosmic (hydrogen) reionization marks one of the major phase transitions of the universe at redshift z ≥ 6. During this epoch, hydrogen atoms in the intergalactic medium were ionized by Lyman continuum (LyC) photons. However, it remains challenging to identify the major sources of the LyC photons responsible for reionization. In particular, individual contributions of quasars (or active galactic nuclei) and galaxies are still under debate. Here we construct the far-ultraviolet luminosity function for type 1 quasars at z ≥ 6 that spans 10 magnitudes (−19 ≤ MUV ≤ −29), conclusively showing that quasars made a negligible contribution to reionization. We mainly search for quasars in the low-luminosity range of MUV > −23 mag that is critical for determination of the total LyC photon production of quasars but has been barely explored previously. We find that the quasar population can only provide less than 7% (95% confidence level) of the total photons needed to keep the universe ionized at z = 6.0–6.6. Our result suggests that galaxies, presumably low-luminosity star-forming systems, are the major sources of hydrogen reionization.
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页码:850 / 856
页数:6
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