活动
【DoA Colloquium】May 28th by Xuheng Ding（WHU）
Description
Title: JWST Detection of Host Galaxies in High-Redshift Quasars and Little Red Dots
Speaker: Xuheng Ding (Wuhan University)
Abstract：
Investigating the evolution connection between AGN and their host galaxies is a core approach to understand the physical mechanisms underlying early black hole growth and galaxy evolution. However, due to cosmological redshift effects, even with deep observations using the Hubble Space Telescope (HST), it remains challenging to detect stellar signals in the host galaxies of quasars with redshift z > 3, which has significantly hindered research progress in this field. The launch and operation of JWST have brought revolutionary opportunities to break through this observational bottleneck. In this report, I will share the practical experience from JWST observations, focusing on our recent work. Based on JWST's high sensitivity, we successfully detected host galaxies of high-redshift quasars with z > 6, achieved accurate measurements of their stellar masses, and systematically analyzed the coordinated evolutionary relationship between the properties of host galaxies and the central supermassive black holes. Additionally, I will share the phased progress we have recently made in investigating whether Little Red Dots (LRDs) possess host galaxies, utilizing relevant observational and analytical techniques.
Bio：
丁旭恒，武汉大学物理科学与技术学院天文系教授。2017年在北京师范大学获得博士学位，之后分别在UCLA和东京大学Kavli IPMU完成了博士后工作。在国际主流期刊发表SCI论文90篇，总引用6800余次，ADS H因子37。担任NASA国际观测计划项目负责人，詹姆斯韦伯空间望远镜(JWST)观测时间与科研基金评审专家。担任ApJL, ApJ，MNRAS，A&A, Nature Communications等期刊审稿人。处理了首批詹姆斯韦伯空间望远镜(JWST)的观测数据，首次探测到宇宙初期(z>6)类星体宿主星系的星光，为探索超大质量黑洞在宇宙早期的生长提供了观测依据。在2023年以唯一第一作者兼通讯作者发表于自然杂志的成果，被外媒评为JWST年度重大发现之一。2024年入选国家级青年人才。
Time: 14:00-15:00,26/May, Tuesday
Venue: Room 506 (Large seminar room), Department of Astronomy
Venue: Room 506 (Large seminar room), Department of Astronomy
You can also access the colloquium via: https://www.koushare.com/space/329883/live
