时间：2025年6月17日（星期二）晚上20:00-21:00

Time: 20:00-21:00, June 17 (Tuesday, Beijing Time), 2025

主持人：西湖大学天文系讲席教授 毛淑德

Host: Prof. Shude Mao, Chair Professor, School of Science

地点：西湖大学云谷校区E5-329A

Venue: E5-329A, Yungu Campus, Westlake University

报告语言：英语

Language：English

Prof. Liang Dai，

Assistant Professor, UC Berkeley

主讲人/Speaker:

Liang Dai is an Assistant Professor at University of California, Berkeley and an Alfred P. Sloan research fellow. His research spans extragalactic astrophysics and cosmology. Liang received his PhD at Johns Hopkins University. He was a NASA Einstein Postdoctoral Fellow at the Institute for Advanced Study before he joined the faculty at UC Berkeley.

摘要/Abstract:

Strong lensing has provided us with opportunities to witness star formation in distant galaxies and under the most extreme conditions. Gas weighing millions to tens of millions of solar masses collapses into a massive cluster of stars of just a few parsecs across, which is thought to be the globular cluster progenitor. When studying such newborn super star clusters in a highly magnified Cosmic Noon galaxy, we were surprised to uncover unusual nebular properties that are unknown in local galaxies but resemble the universe’s first galaxies: highly pressurized ionized gas within parsecs of massive stars and heavy nitrogen pollution. These new findings beg a list of intriguing questions: What is the dynamical origin of the nebular signatures? What stars have dumped nitrogen? Does the enriched gas give birth to new stars? In this talk, I will present our analysis and findings and reconstruct an underlying physical picture.

联系人/Contact:

School of Science, Yannan Yu, Email: yuyannan@westlake.edu.cn