利用Sherwood-Relics模拟探究再电离时代星系对其局部星系间介质的影响
Exploring the influence of reionisation-era galaxies on their local intergalactic medium using the Sherwood-Relics simulations
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中文总结 AI 辅助
本研究利用Sherwood-Relics模拟探究再电离时代星系与星系间介质（IGM）的关联，发现星系附近小半径处IGM更不透明、大半径处更电离，与ASPIRE观测定性一致，支持[OIII]发射体在再电离中塑造IGM性质的重要作用。
中文摘要 AI 辅助
近期巡天在类星体光谱的莱曼-α森林中，于高红移发射线星系周围数兆秒差距（Mpc）尺度上探测到过量通量，表明星系间介质（IGM）的透过率与再电离时代星系之间存在相关性。我们利用Sherwood-Relics模拟套件（一组混合辐射流体动力学模拟，用于模拟高红移下的IGM）来研究星系与IGM之间的联系。我们依据JWST的ASPIRE计划的巡天规格，模拟了莱曼-α森林以及一群模拟的[OIII]发射体。我们测量了星系附近区域有效光学深度的演化，并将其与探测随机IGM的对照样本进行对比。我们描述了IGM物理性质的变化，以解释在5.4 < z < 6.2之间观测到的视线间不透明度的离散性。我们发现，在星系附近的小半径（r ≤ 5 cMpc/h）区域内，由于这些区域过密，IGM比平均情况更加不透明。在较大半径（15 < r ≤ 50 cMpc/h）处，由于星系附近较高的光电离速率，IGM比平均情况更加电离。我们发现与ASPIRE的观测结果定性一致，尽管我们看到了由宇宙方差引起的大幅实现间离散，这在星系-莱曼α透过率互相关函数的理论探索中也有所见。我们的结果总体上与声称[OIII]发射体周围存在大尺度电离偏置的观测相符，支持了它们在再电离期间塑造IGM性质方面发挥重要作用的观点。
英文摘要
Recent surveys have detected excess flux in the Lyman-$α$ forest of quasar spectra several Mpc from high-redshift line-emitting galaxies, indicating a correlation between intergalactic medium (IGM) transmission and reionisation-era galaxies. We examine the galaxy-IGM connection using the Sherwood-Relics simulation suite, a set of hybrid radiation-hydrodynamic simulations that model the IGM at high redshift. We simulate the Lyman-$α$ forest and a population of mock [OIII] emitters using the survey specifications of JWST's ASPIRE programme. We measure the evolution of the effective optical depth in regions close to galaxies, and contrast this with a control sample probing the random IGM. We characterise the changing physical properties of the IGM to explain the observed sightline-to-sightline scatter in opacity between 5.4 < $z$ < 6.2. We find that the IGM is more opaque than average at small radii ($r$ $\leq$ 5 cMpc/$h$) close to galaxies, as these regions are overdense. At larger radii (15 < $r$ $\leq$ 50 cMpc/$h$), the IGM is more ionised than average, due to the higher photoionisation rate near galaxies. We find qualitative agreement with the observational results from ASPIRE, though we see large realisation-to-realisation scatter driven by cosmic variance, as also seen in theoretical explorations of the galaxy-Ly$α$ transmission cross-correlation function. Our results generally agree with observations claiming that there is a large-scale ionisation bias around [OIII] emitters, supporting the idea that their role is significant in shaping the properties of the IGM during reionisation.
发表机构
- Max Planck Institut für Astrophysik（马克斯·普朗克天体物理研究所）
- Institute for Astronomy, University of Edinburgh（爱丁堡大学天文研究所）
- School of Physics and Astronomy, The University of Nottingham（诺丁汉大学物理与天文学院）
- Department of Astronomy, University of Michigan（密歇根大学天文学系）
- Leibniz-Institut für Astrophysik Potsdam（波茨坦莱布尼茨天体物理研究所）
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