Oral Presentation

Greenland Telescope and ALMA Baselines: Key to Image Black Hole Shadow

Author(s): Satoki Matsushita (ASIAA) and the Greenland Telescope (GLT) Project Team Members

Presenter: Satoki Matsushita (ASIAA)

ALMA will start VLBI observations from Cycle 4 (spring 2017) in Bands 3 & 6. In Cycle 5 (spring 2018),the Greenland Telescope (GLT) will join the ALMA-VLBI observations. With ALMA's high sensitivity and the very long baseline length (> 9000 km) betwee ALMA and GLT, together with the other mm/submm telescopes all over the world, we aim to image the supermassive black hole shadow in M87 for the first time. The shadow size is expected to be around 40 micro-arcsec, and the ALMA-GLT baseline length gives us 20-30 micro-arcsec resolution. In this presentation, I will show the current knowledge of M87 revealed by past cm/mm VLBI observations, and the current status of GLT. I then present the expectation of the ALMA Cycle 5 VLBI observations toward M87 with GLT and other mm/submm telescopes.