Title：Ultra-high resolution VLBI studies of the Galactic center

　　Speaker：Dr. Rusen Lu （Max-Planck Institute for Radio Astronomy）

　　Abstract：In recent years, significant progress in millimeter VLBI has been made with the Event Horizon Telescope project, which aims to resolve strong field General Relativistic (GR) signatures in nearby supermassive black holes (in particular Sgr A* and M87). The first part of this talk will deal with the question of whether or not these signatures can be imaged when the radio emission from Sgr A* exhibits variability on timescales of minutes, much shorter than the duration of a typical VLBI imaging experiment. The second part will focus on the first 230 GHz VLBI observations of Sgr A* with the APEX telescope in 2013. With a resolution of 3 Schwarzschild radii, these observations reveal “complex” structures that have never been seen before. With the expected improvement in array performance, future observations could lead to direct detection of strong GR signatures, e.g., the black hole shadow.

　　Time：Oct. 12th (Monday), 10:30am

　　Place：Room 212, Astronomy Building

欢迎各位老师、同学参加！

　　                                             南京大学天文与空间科学学院