The 13th Tsung-Dao Lee Frontier Lecture (18:30-19:30)
Title: First Sgr A* Event Horizon Telecope Results: The Shadow of the Supermassive Black Hole in the Center of the Milky Way
Speaker: Yosuke Mizuno
Abstract:
We present the first Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A*), the Galactic center source associated with a supermassive black hole. These observations were conducted in 2017 using a global interferometric array of eight telescopes operating at a wavelength 1.3 mm. A variety of imaging and modeling analyses all support an image that is dominated by a bright, thick ring with a diameter of ~50 micro-arcsecond. Using a large suite of numerical simulations and model comparison, we demonstrate that the EHT images of Sgr A* are consistent with the expected appearance of a Kerr black hole with mass ∼4 million solar mass, which is inferred to exist at this location based on previous infrared observations of individual stellar orbits, as well as maser proper-motion studies. Our results provide direct evidence for the presence of a supermassive black hole at the center of the Milky Way. In this talk, I will compare with two EHT observed black hole shadows, M87 and Sgr A*.
Panelists: Zhiqiang Shen (SHAO), Xiaogang He (TDLI), Pengjie Zhang (TDLI), Yosuke Mizuno (TDLI), Yuzhu Cui (TDLI)
Colloquium (20:00-21:00)
Title: Testing Astrophysical Models from the Shadow of the Galactic Center Black Hole
Abstract:
In the colloquium, from the overview of our results in Frontier Lecture, I will focus on more theoretical interpretation and model comparison to understand the accretion flow properties nearby Sgr A*.