This page lists the Seminars that were given virtually on zoom in 2026. The EAO staff would like to thank all guest speakers and encourage new astronomers/instrument specialists to give virtual talks.
Title: Evolution of Hub–Filament Structures in Star Formation
Speaker: Nanda Kumar (Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto)
Abstract:
The hub–filament geometry of star-forming molecular gas is central to understanding several long-standing problems in star formation, ranging from the origin of massive stars to the possibility of a unified formation mechanism across the full stellar mass spectrum. The temporal evolution of this geometry also provides critical insight into key physical properties of the star-formation process. In this talk, I will address these issues using multi-wavelength observational data, with particular emphasis on recent JCMT/POL-2 observations of three star-forming regions.
Title: Initial Conditions of Star Formation
Speaker: Dalei Li (Xinjiang Astronomical Observatory)
Abstract:
Stars are believed to form from dense collapsing molecular cores.
Studies of these cores provide crucial insights into the initial conditions and earliest stages of star formation. In this talk, I will present hydrodynamic models together with molecular spectral line observations to investigate the physical conditions leading to star formation, as well as the potential role of core–core collisions in triggering the collapse of dense cores. Particular attention will be given to the prototypical source Barnard 68.
Studies of these cores provide crucial insights into the initial conditions and earliest stages of star formation. In this talk, I will present hydrodynamic models together with molecular spectral line observations to investigate the physical conditions leading to star formation, as well as the potential role of core–core collisions in triggering the collapse of dense cores. Particular attention will be given to the prototypical source Barnard 68.
Title: Observational Studies of Two Gaseous Environments: Local AGNs and Distant SMGs
Speaker: Shoichiro Mizukoshi (ASIAA)
Abstract:
Gaseous media in the universe are essential to both galaxy evolution and the growth of supermassive black holes. In this talk, I will introduce two distinct projects we have undertaken that each focus on gaseous environments through different observational approaches. The first part focuses on the gaseous environment in the vicinity of active galactic nuclei (AGNs). In this project, we utilized the infrared flux variability, which is characteristic of the AGN, to distinguish between dusty gas and dust-free gas components around the AGN for the first time, and discussed the radiation-pressure effect on these different gas structures. I will also present our recent results on variability analysis of the broad Halpha line for local AGNs with unique characteristics uncovered by our independent analysis. The second part focuses on the gaseous environment in submillimeter galaxies (SMGs). In this project, we performed [CII]158µm observations using ALMA for flux-limited SMG sample at z = 3-5, originally detected by the SCUBA-2 survey. Thanks to the bright nature of our sample, we successfully detected the [CII] line for 16 out of 18 targets with S/N>10. Most of the detected [CII] lines exhibit complex profiles that reflect the kinematics of [CII]-emitting gas. I will also present our preliminary results regarding correlations between [CII] luminosity and several physical properties, such as star formation rate and molecular gas mass.