报告摘要：Angular momentum is a key quantity linking the formation of galaxies to the dynamics of the cosmic web. Building on a series of recent observational and theoretical works, this talk will present a picture of how angular momentum is generated, transported and reprocessed across scales—from megaparsec-scale filaments, through galaxy clusters, down to individual galaxies. I will first show how large-scale cosmic filaments can host measurable spin, and how a well-defined characteristic radius provides a robust dynamical boundary for these structures. I will then demonstrate that galaxy clusters act as an intermediate “bridge” in this cosmic dance: using new observational estimators, we can detect statistically significant rotation in clusters and establish systematic alignments between cluster spin, filament axes, and the spins of brightest central galaxies. Finally, I will discuss a two-phase model of galaxy angular momentum evolution, in which galaxies initially acquire spin via laminar accretion perpendicular to filaments and later undergo spin reorientation through mergers and anisotropic inflows along filaments, naturally explaining the observed spin–filament alignment flip with mass and time. Together, these results map out a coherent multi-scale pathway for angular momentum transfer in the Universe, from large-scale structure to the internal dynamics of galaxies.
主讲人简介：Dr. Peng Wang is a Researcher at the Shanghai Astronomical Observatory (SHAO), CAS. He received his Ph.D. in Astronomy from Purple Mountain Observatory (PMO), CAS, in January 2019. From 2019 to 2022, he worked as a postdoctoral researcher at the Leibniz Institute for Astrophysics Potsdam (AIP), Germany. In March 2022, he joined SHAO as a faculty member. Dr. Wang was selected for the CAS Pioneer Hundred Talents Program (Category B). His research focuses on large-scale structure of the Universe, galaxy formation, and the spatial distribution of satellite galaxies. He has published over 40 papers, including ~20 as first or corresponding author in leading journals such as Nature Astronomy, ApJL/ApJ, MNRAS. Dr. Wang is PI or co-PI on multiple projects funded by the NSFC. He has also been supported by talent programs including the Shanghai XSC Program, Shanghai Pujiang Talent Program, and Shanghai Rising-Star Program (A-class).
