发表机构
Space Telescope Science Institute; Flatiron Institute; The University of Texas at Austin（太空望远镜科学研究所; 弗莱提荣研究所; 德克萨斯大学奥斯汀分校）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
借助GUREFT暗物质宇宙学模拟和圣克鲁斯半解析模型，研究宇宙黎明到再电离时代星系的恒星形成历史，发现星系恒星形成历史多样，且相关时间随质量和红移有变化规律，对解释观测指标有重要意义。
AI 中文摘要
詹姆斯·韦伯太空望远镜为早期宇宙星系演化打开新窗口。本文利用从GUREFT仅暗物质宇宙学模拟套件中提取的晕合并树以及圣克鲁斯星系形成半解析模型，研究从宇宙黎明（z~14）到再电离时代末期（z~6）星系的预测恒星形成历史。
英文摘要
The James Webb Space Telescope (JWST) has opened a new window onto galaxy evolution in the very early Universe. In this work, we leverage halo merger trees extracted from the GUREFT dark-matter-only cosmological simulation suite together with the Santa Cruz semi-analytic model (SAM) for galaxy formation to investigate the predicted star formation histories (SFHs) of galaxies from cosmic dawn (z ~ 14) to the end of the Epoch of Reionization (EoR; z~6). While we find that on average, median SFHs of galaxies across all masses are uniformly and rapidly rising over time from 14 < z < 6 as expected, individual galaxy SFHs show a range of diverse SFHs, even for a fixed terminal mass or redshift, with bursts and mini-quenching episodes in agreement with SFHs inferred from observations. The median lookback time to form the youngest 50% (t_50) and 90% (t_90) of galaxies' stars decreases weakly with increasing stellar mass, and strongly with the redshift of observation. For galaxies at z>12, we find typical values of t_50 < 30 Myr and t_90 < 70 Myr, a factor of ~3 to 4 shorter than for comparable galaxies near the end of EoR (z ~ 6). The young-star dominated nature of stellar populations in ultra-high-z galaxies implies that careful modelling of young stellar populations is crucial for obtaining accurate synthetic photometry. In addition, our results have important implications for interpreting observational indicators of star formation histories and timescales.
CommentsAccepted version, MNRAS in press
