令人震惊的真相：引力对氢再电离的微小贡献
The Shocking Truth: The small contribution to hydrogen reionization from gravitational infall
摘要：
人们普遍认为，恒星是宇宙再电离的原因。然而，在再电离时期对恒星形成星系的深入搜索还没有找到足够的星系来提供必要的电离通量。在星系形成过程中与重子引力下落相关的快速吸积激波最近被提出作为产生所需电离光子的替代方法。在这封信中，我们评估了与重力下降相关的冲击气体对氢再电离的贡献。我们发现，冲击波能在z~6时吸收宇宙氢的百分之几。然而，由快速吸积冲击产生的小部分电离辐射将比与恒星相关的电离辐射明显更有偏差，导致亮度加权源聚类的修改约为10%。这种偏差的修正可以通过未来的精密实验来测量，这些实验利用红移的21厘米线来研究再电离时代氢的分布。
英文摘要：
It is commonly thought that stars are responsible for reionizing the Universe. However, deep searches for star-forming galaxies during the epoch of reionization have not yet found sufficient galaxies to provide the necessary ionising flux. Fast accretion shocks associated with gravitational infall of baryons during the formation of galaxies have recently been proposed as an alternative method of generating the required ionising photons. In this Letter we assess the contribution to hydrogen reionization from shocked gas associated with gravitational infall. We find that shocks can ionize no more than a few percent of the cosmic hydrogen by z~6. However, the small fraction of ionizing radiation produced by fast accretion shocks would be significantly more biased than that associated with stars, leading to a modification of the luminosity weighted source clustering by ~10%. This modification of the bias may be measurable with future precision experiments utilising the redshifted 21cm line to study the distribution of hydrogen during the reionization era.
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