Special Colloquium
Dr. Guang-Xing Li	SCHEDULED

SWIFAR, Kunming

Modern Astronomical Observations provide high-fidelity images that might contain complex structures. The effective approaches to analyzing these structures remain missing. Here, I present a method, which can extract information from these maps by analyzing the relationship between measurement values from adjacent pixels. The method can reveal regularities in the parameter space, which is hard to obtain otherwise, and can provide optimal ways to divide a region into patches of heterogeneous properties. I provide examples where the method has been used to analyze astronomical, medical, agricultural, and climate images.

	Special Colloquium
Prof. Dr. Jongho Park	SCHEDULED

KyungHee University

Very Long Baseline Interferometry (VLBI) achieves ultrahigh angular resolution by utilizing widely separated radio telescopes. The quality of VLBI images improves with more participating telescopes, a principle realized by the Global VLBI Alliance (GVA). In this talk, I will present recent advances in AGN jet studies enabled by the GVA. 1. We identified a dense, cold ambient medium near the core of the 3C 84 jet, which guides its propagation on parsec scales and significantly influences its overall shape. 2. Our observations of NGC 315 reveal that its jet, previously known for a center-brightened morphology at parsec scales, is actually edge-brightened—a feature unresolved in earlier VLBI studies. I will discuss the physical implications of these findings and explore future research opportunities with the GVA and the Global Millimeter VLBI Array (GMVA).

	Main Colloquium
Dr. Hannah Uebler	SCHEDULED

MPE

One of the most surprising results coming out of the first two years of science operations with JWST is the unexpectedly high abundance of actively accreting black holes in the early Universe. Compared to the local population, many of these early black holes appear to differ in various aspects, such as their relation to their host galaxies or their multi-wavelength properties. These observational findings challenge our understanding of the past evolution of present-day supermassive black holes, and provide new ways to constrain theoretical models of black hole formation and growth. I will give an overview of recent observational results on massive black holes in the first few billion years and how they fit into current models, largely driven by the unprecedented capabilities of JWST to explore cosmic dawn, and with a focus on results from the NIRSpec GTO surveys JADES and GA-NIFS.