First Sgr A* Event Horizon Telecope Results:
The Shadow of the Supermassive Black Hole in the Center of the Milky Way
Yosuke Mizuno（水野陽介）
EHT合作组理论和模拟工作组组长
李政道学者
物理与天文学院长聘教轨副教授
Yosuke Mizuno is T.D. Lee Fellow and Associate Professor at Tsung-Dao Lee Institute in Shanghai Jiao Tong University. He obtained a PhD from Kyoto University in 2004. He was a postdoc at Department of Astronomy, Kyoto University, Japan (2004-2005), NASA postdoctoral program fellow at NASA Marshall space flight center, USA (2005-2008), research scientist at University of Alabama in Huntsville, USA (2008-2011), associate research scholar at National Tsing-Hua University, Taiwan, China (2011-2014), and research associate at Goethe University Frankfurt, Germany (2014-2020). He joined Tsung-Dao Lee Institute on October 2020. He is a Theory & Simulation Working Group coordinator (2017-present) on Event Horizon Telescope collaboration. He has worked on relativistic astrophysics, plasma astrophysics, and high-energy astrophysics by using numerical simulations. He has received a number of awards, including 2019 Breakthrough Prize in Fundamental Physics and Einstein Medal 2020 under EHT collaboration. 本讲坛预计20:00结束，之后主讲人将继续进行题为Testing Astrophysical Models from the Shadow of the Galactic Center Black Hole 的Colloquim，欢迎继续观看。
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*.编辑：王媛媛
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