SYNTHESIZER中的恒星光致电离建模
Stellar photoionisation modelling in SYNTHESIZER
AI总结：
该研究将光致电离气体发射整合进SYNTHESIZER包，量化关键建模假设的影响，展示其在多场景的通用性，为恒星和星云发射建模提供灵活框架，连接理论与观测。
AI中文摘要：
年轻恒星周围电离气体（HII区）的发射为恒星形成星系的物理条件提供了关键诊断，可约束气体性质、电离源本质，并为确定星系红移生成重要特征。为利用光谱观测检验星系形成模型，需将这些发射纳入合成数据集。本文介绍将电离气体发射整合进SYNTHESIZER包（网址：this https URL）并展示其应用，量化恒星族群合成模型、初始质量函数、电离参数、气体密度、几何结构、丰度模式、元素耗尽及尘埃等关键建模假设对光谱诊断的影响。还通过不同场景展示SYNTHESIZER的通用性，涵盖从探索参数化玩具模型的发射到具有真实恒星形成和金属丰度演化历史的大体积宇宙学模拟的应用。综上，SYNTHESIZER提供了灵活、符合物理原理的框架，用于建模恒星和星云发射，成为下一代光谱观测任务时代理论与观测之间的重要纽带。
英文摘要：
Emission from photoionised gas surrounding young stellar populations ($H\text{II}$ regions) provides critical diagnostics of the physical conditions in star forming galaxies. This emission constrains the gas properties, the nature of ionising sources, and generates essential features for determining galaxy redshifts. To leverage spectroscopic observations to test galaxy formation models, it is essential to incorporate these emissions into synthetic datasets. Here, we present the integration of photoionised gas emission into the SYNTHESIZER package (https://synthesizer-project.github.io) and demonstrate its application. We quantify the impact of key modelling assumptions - including stellar population synthesis models, initial mass functions, ionisation parameter, gas density, geometry, abundance pattern, elemental depletion, and dust - on spectral diagnostics. Furthermore, we demonstrate the versatility of SYNTHESIZER through its application in different scenarios ranging from exploring emission in toy parametric models to large-volume cosmological simulations with realistic star formation and metal enrichment histories. Taken together, SYNTHESIZER provides a flexible, physically motivated framework to model stellar and nebular emissions, serving as a vital link between theory and observations in the era of next-generation spectroscopic missions.
