Oral Presentation

Physical Origin of the Asymmetric Ring in the Event Horizon Telescope Result

Author(s):

Presenter: Keiichi Asada (ASIAA)

The Event Horizon Telescope (EHT) has mapped the central compact radio source of the giant elliptical galaxy M87 in 2017. A black hole (BH) is expected to reveal a dark shadow caused by gravitational light bending and photon capture near the event horizon. EHT 2017 observations provide a ring-like morphology with a central brightness depression with a shadow diameter of ~ 42 micro arcsecond, indicating that the region contains a supermassive black hole with 6.5 billion solar masses. Physical implications of the asymmetric ring and its interpretation are briefly reported.