Tracing the Metallicity in High Redshift Quasars with FeII Spectra

高红移类星体是目前唯一能给我们提供早期宇宙核合成信息的天体。它们的光谱中有明显的FeII发射特征。由于铁元素的相对丰度与ia型超新星密切相关，因此铁元素成为了早期恒星形成活动年龄的一个非常重要的年代学指标。这项工作的主要目标是开发诊断工具来解释这种FeII排放。这些FeII诊断将被用作恒星形成的宇宙探测器，并确定早期宇宙类星体中的铁丰度。该项目旨在结合来自美国、欧洲和日本的FeII领先的理论、观测和实验小组的努力，因此具有国际范围。它包括空间和地面光谱观测，原子物理学的理论和实验输入，最终将在观测FeII的理论建模中达到高潮

AST-0206150Verner, Ekaterina M.High-redshift quasars are currently the only objects that can give us information aboutnucleosynthesis in the very Early Universe. Many exhibit prominent FeII emission features in their spectra. Because the relative abundance of Fe is tightly correlated with Type-Ia supernovae, FeII becomes a very important chronological indicator of the age of star formation activity at the earliest epochs. The principal goal of this work is to develop diagnostic tools to interpret this FeII emission. These FeII diagnostics will be used as cosmological probes of star-formation and to determine the iron abundance in the quasars of the Early Universe. This project is designed to combine the efforts of the leading theoretical, observational and experimental groups working on FeII from the USA, Europe and Japan, and is therefore international in scope. It includes both space- and ground-based spectroscopic observations, theoretical and experimental input from atomic physics, and finally will culminate in theoretical modeling of the observed FeII.***