题目：Diffuse interstellar bands in Gaia RVS spectra
主讲人：赵赫 智利Anders Bello大学博士后
时间：2025年12月22日(周一)15:00
地点：九里校区J4320室
主持人：刘尧 副研究员
简历：赵赫，2021年博士毕业于法国尼斯蔚蓝海岸大学，2022年至2025年期间在紫金山天文台从事博士后研究工作。2025年2月出站后，赴智利Anders Bello大学继续从事博士后研究工作。Gaia项目组成员Gaia CU8 DlB-spec模块负责人。主要研究方向为银河系星际消光与尘埃性质、弥漫星际带、超新星遗迹中的尘埃等领域。
摘要：Diffuse interstellar bands (DIBs) comprise more than 600 broad absorption features observed between 0.4 and 2.4 microns, widely thought to originate from electronic transitions in complex molecules such as polycyclic aromatic hydrocarbons (PAHs) and fullerenes. As such, DIBs serve as powerful diagnostics for exploring the lifecycle and properties of complex organic material in diverse interstellar environments. The Gaia Radial Velocity Spectrometer (RVS) records two prominent DIBs at 862.1 nm (strong) and 864.8 nm (broad). In this talk, I will present our measurements of these two features in Gaia RVS spectra, along with the released products in Gaia DR3 and FPR. I will further discuss an analysis of the carrier properties of the 862.1 nm DIB, including its spatial distribution, kinematics, and evidence for its cationic nature as revealed by its environmental behavior relative to interstellar dust.
