恒星与类星体在宇宙氢再电离中的竞争
The Race Between Stars and Quasars in Reionizing Cosmic Hydrogen
摘要：
一旦宇宙年龄达到20亿年，电离辐射的宇宙学背景就被类星体所控制。在早期（红移z>3），观测到的明亮类星体的丰度急剧下降，这意味着宇宙氢被恒星重新电离。在这里，我们解释的恒星和类星体之间的主导地位的过渡作为一个通用的结构形成的和谐LCDM宇宙学的特征的物理起源。在早期，星系中重子比例的增长速度比类星体可能的最大（Eddington限制）增长率要快。因此，类星体无法赶上宿主星系中恒星质量的快速早期增长。
英文摘要：
The cosmological background of ionizing radiation has been dominated by quasars once the Universe aged by ~2 billion years. At earlier times (redshifts z>3), the observed abundance of bright quasars declined sharply, implying that cosmic hydrogen was reionized by stars instead. Here, we explain the physical origin of the transition between the dominance of stars and quasars as a generic feature of structure formation in the concordance LCDM cosmology. At early times, the fraction of baryons in galaxies grows faster than the maximum (Eddington-limited) growth rate possible for quasars. As a result, quasars were not able to catch up with the rapid early growth of stellar mass in their host galaxies.
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