论文标题
类星体接近区大小的分布和演变
The Distribution and Evolution of Quasar Proximity Zone Sizes
论文作者
论文摘要
在本文中，我们研究了通过在计算机模拟（CROC）模拟上进行宇宙电离获得的合成类星体吸收光谱的类星体接近区的大小。 CROC模拟既具有相对较大的盒子尺寸，又具有高空间分辨率，从而使我们可以解决Lyman限制系统，这对于对类星体吸收光谱进行建模至关重要。我们发现，在校准之前，大多数类星体接近区域的大小都以$ \ sim 10 $ Myr稳定增长，而在校准后，它们迅速生长，但仅以$ \ sim 0.1 $ MYR。我们还发现$ r _ {\ rm obs} $的缓慢增长，降低了转交速度。此外，我们发现$ \ sim 1-2 \％$的旧类星体（$ 30 $ yr old）显示出极小的接近区域尺寸（$ <1 $ $ <1 $适当的MPC），其中绝大多数是由于沿景点沿线造成的$ $α$吸收器（DLA）或Lyman Liges light System（LLS）沿沿景点而言。这些DLA和LLS被金属污染，这提供了一种将它们与年轻类星体的正常接近区区分开的方法。
In this paper, we study the sizes of quasar proximity zones with synthetic quasar absorption spectra obtained by post-processing a Cosmic Reionization On Computers (CROC) simulation. CROC simulations have both relatively large box sizes and high spacial resolution, allowing us to resolve Lyman limit systems, which are crucial for modeling the quasar absorption spectra. We find that before reionization most quasar proximity zone sizes grow steadily for $\sim 10$ Myr, while after reionization they grow rapidly but only for $\sim 0.1$ Myr. We also find a slow growth of $R_{\rm obs}$ with decreasing turn-on redshift. In addition, we find that $\sim 1-2\%$ of old quasars ($30$ Myr old) display extremely small proximity zone sizes ($<1$ proper Mpc), of which the vast majority are due to the occurrence of a damped Ly$α$ absorber (DLA) or a Lyman limit system (LLS) along the line of sight. These DLAs and LLSs are contaminated with metal, which offers a way to distinguish them from the normal proximity zones of young quasars.
