论文标题
方尖碑模拟：星系对原始群体的HI回离贡献更多
The Obelisk simulation: galaxies contribute more than AGN to HI reionization of protoclusters
论文作者
论文摘要
我们介绍了方尖碑项目，这是一个宇宙辐射流动力学模拟，在从大爆炸开始的前20亿年中，原始群集祖细胞组装和电击后，下降到$ z = 3.5 $。模拟将光环降低到原子冷却极限，并跟踪不同电离源的贡献：恒星，活跃的银河核和碰撞。方尖碑项目专门用于研究有利于黑洞生长的环境中高红移星系和类星体的共同进化。在本文中，我们确定了这两种辐射源对电离的相对贡献及其在建立和维持高红移电离背景中的各自作用。我们的体积是宇宙过度土地的典型代表，并显示了类似于高红移原始群体的恒星形成率和黑洞积聚速率密度。我们发现，氢回离发生在内而外，并在我们的过度密度中由$ z \ sim 6 $完成，并且主要由星系驱动，而积聚的黑洞仅在$ z \ sim 4 $中起着作用。
We present the Obelisk project, a cosmological radiation-hydrodynamics simulation following the assembly and reionization of a protocluster progenitor during the first two billions of years from the big bang, down to $z = 3.5$. The simulation resolves haloes down to the atomic cooling limit, and tracks the contribution of different sources of ionization: stars, active galactic nuclei, and collisions. The Obelisk project is designed specifically to study the coevolution of high redshift galaxies and quasars in an environment favouring black hole growth. In this paper, we establish the relative contribution of these two sources of radiation to reionization and their respective role in establishing and maintaining the high redshift ionizing background. Our volume is typical of an overdense region of the Universe and displays star formation rate and black hole accretion rate densities similar to high redshift protoclusters. We find that hydrogen reionization happens inside-out and is completed by $z \sim 6$ in our overdensity, and is predominantly driven by galaxies, while accreting black holes only play a role at $z \sim 4$.
