Reionizing Islands with Inhomogeneous Recombinations  

作　　者：朱润玉 徐怡冬 岳斌 陈学雷 Runyu Zhu;Yidong Xu;Bin Yue;Xuelei Chen(National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China;Department of Physics,College of Sciences,Northeastern University,Shenyang 110819,China;Center of High Energy Physics,Peking University,Beijing 100871,China)

机构地区：[1]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [2]School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Physics,College of Sciences,Northeastern University,Shenyang 110819,China [4]Center of High Energy Physics,Peking University,Beijing 100871,China

出　　处：《Research in Astronomy and Astrophysics》2023年第6期172-186,共15页天文和天体物理学研究（英文版）

基　　金：supported by the National Key R&D Program of China No.2018YFE0120800;the National Natural Science Foundation of China grant No.11973047;the National Key R&D Program of China No.2022YFF0504300;the National SKA Program of China Nos.2020SKA0110401,and 2020SKA0110402。

摘　　要：Observations are beginning to constrain the history of the epoch of reionization(EoR).Modeling the reionization process is indispensable to interpret the observations,to infer the properties of ionizing sources,and to probe the various astrophysical processes from the observational data.Here we present an improved version of the seminumerical simulation islandFAST,by incorporating inhomogeneous recombinations and a corresponding inhomogeneous ionizing background,and simulate the reionization process of neutral islands during the late EoR.We find that the islands are more fragmented in models with inhomogeneous recombinations than the case with a homogeneous recombination number.In order to investigate the effects of basic assumptions in the reionization modeling,we compare the results from islandFAST with those from 21cmFAST for the same assumptions on the ionizing photon sources and sinks,to find how the morphology of the ionization field and the reionization history depend on the different treatments of these two models.Such systematic bias should be noted when interpreting the upcoming observations.

关 键 词：(cosmology:)dark ages REIONIZATION first stars (galaxies:)intergalactic medium (cosmology:)large-scale structure of universe galaxies:high-redshift 

分 类 号：P15[天文地球—天文学]