中国科学院云南天文台学术报告通知

2025年第22期

报告题目：The outburst phenomena and potential physical mechanisms in the Changing-look AGN from DESI

报告人：郭威坚 博士

报告人单位：中国科学院国家天文台

报告语言：中文

报告时间：2025年7月9日（星期三）10:30-12:00

报告地点：3号楼1楼会议室

报告摘要：

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Changing-Look Active Galactic Nuclei (CL-AGNs) challenge both the standard accretion disk paradigm and the orientation-based AGN unification model. Leveraging the first-year data release from the Dark Energy Spectroscopic Instrument (DESI), we construct the largest CL-AGN sample to date, comprising over 500 candidates, and present the first comprehensive statistical analysis of such a population. Our analysis suggests that a significant fraction of CL events—particularly those involving changes in only one BEL—may stem from typical AGN variability under low accretion rates, rather than from extreme or external phenomena. In this talk, I will focus on a subclass of CL-AGNs undergoing multiple outburst and potential physical mechanisms. Additionally, I will elucidate the operation and data model of DESI, aiming to facilitate the utilization of these spectra.  

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报告人简介： 

Wei-Jian Guo is assistant research at the NAOC and a member of the DESI collaboration, where he works within the Galaxy and Quasar Physics Group. His primary research interests include supermassive black holes, AGN variability and accretion physics.

云台邀请方：南方基地、云南天文台青促会小组

邀请方联系人：卢开兴