專題演講 Seminar

2021/10/29(Fri)     11:00 -12:00    五樓第一會議室 5F, 1st Meeting Room

Title

Revealing the Unresolved Astrophysics of Galaxy Evolution with Large Sky Surveys

Speaker

藍鼎文教授 (國立台灣大學物理系暨天文物理研究所)

Prof. Ting-Wen Lan (Department of Physics & Institute of Astrophysics, National Taiwan University)

Abstract

Understanding how galaxies form and evolve has been one of the most important topics in astrophysics. In the past two decades, astrophysicists have realized that the so-called feedback mechanisms which regulate mass and energy into and out of galaxies play a fundamental role in driving galaxy evolution. In this talk, I will first introduce the current challenges of understanding the physics of feedback and demonstrate that the properties of gas around galaxies, the circumgalactic medium (CGM), are essential to overcome these challenges. I will present my research that probes the CGM by utilizing the power of statistical analysis applied to big datasets of large sky surveys. The results have motivated not only new theoretical investigations of galaxy formation astrophysics but also the development of new sky surveys. I will describe one of such surveys, the Dark Energy Spectroscopic Instrument (DESI) survey, in which I participate. I will summarize the main scientific goal of the DESI survey, i.e. to unveil the evolution of dark energy, along with the role I currently play in the collaboration. Finally, I will discuss the potential of combining machine learning techniques and big data to reveal new astrophysics of galaxy formation and cosmology in the upcoming era of large sky surveys.

Language

演講語言 (Language): in English