Speaker: Yan Gong (Purple Mountain Observatory)

Venue: KIAA-Auditorium

Time: 16:00—17:00 p.m., Nov 7, 2024, GMT+8

Host: Shao Lijing (lshao@pku.edu.cn)

Introduction to the speaker:

Yan Gong got his PhD from Purple Mountain Observatory in 2016. Following his PhD, he joined Max-Planck-Institute for Radio Astronomy as a postdoctoral researcher from 2017 to 2021, and then continued there as a scientific staff member from 2021 to 2023. Starting in 2024, he has been serving as a guest scientist at both Purple Mountain Observatory and Max-Planck-Institute for Radio Astronomy. His research focuses on molecular clouds, star formation, astrochemistry, circumstellar envelopes of late-type stars, and astronomical masers.

Abstract:

The interstellar medium (ISM) is the engine driving the cosmic cycle, playing a pivotal role in star formation, stellar evolution, and feedback from supernova remnants. Understanding these processes is key to unraveling the broader evolution of galaxies. In this talk, I will present recent advancements from several studies, shedding light on different stages of the ISM and its impact on galactic ecosystems. First, I will highlight the latest results from the GLOSTAR survey, a comprehensive radio study that uncovers new details about massive star formation and the discovery of supernova remnants in our Galaxy. Next, I will delve into the molecular chemistry of HCNH+, examining its behavior across diverse environments. As a diagnostic tool, HCNH+ provides valuable insights into the early stages of molecular cloud evolution and the effects of feedback from star formation. Finally, I will explore the systematic identification of masers in carbon-rich AGB stars, revealing dichroic masers in circumstellar envelopes of AGB stars. These masers offer a unique window into the later stages of stellar evolution, potentially leading to new insights into stellar physics and evolution. By connecting these topics, this talk aims to provide new facets on the ISM, from the birth of stars to the intricate chemistry of molecular clouds and the final stages of stellar evolution.