Current Progress of observational black hole astrophysics with mm/submm VLBI.

Keiichi Asada^1*

¹Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan

* Presenter:Keiichi Asada, email:asada@asiaa.sinica.edu.tw

In 2019, the Event Horizon Telescope (EHT) collaboration has revealed the first-ever images of a black hole shadow at the heart of a giant elliptical galaxy Messier 87 (M87). The Event Horizon Telescope (EHT) Collaboration, led by Prof. Shep Doeleman at the Smithsonian Astrophysical Observatory (SAO), is an international collaboration to form a submm very long baseline interferometer (VLBI) array in order to image the shadows of supermassive black holes (SMBHs) in Sgr A* and M87. It pioneered the new era of the observational black hole astrophysics using mm/submm Very Long Baseline Interferometers. In meanwhile, we, Institute of Astronomy and Astrophysics, Academia, have been initiated a new mm/submm VLBI project. Greenland Telescope is one of the main contributions for this research field. GLT has started to participate EHT and Global Millimeter VLBI Array observations since 2018. We also start East Asian VLBI observations together with JCMT and telescopes in East Asia region. In 2019, we succeeded to detect fringe between JCMT and GLT at 230 GHz by ourselves. In the talk, I will report the progress on this area.

Keywords: black hole, mm/submm VLBI, EHT, GLT, JCMT