Greenland Telescope (GLT) Project: "A Direct Confirmation of Black Hole
  with Submillimeter VLBI"
  The GLT project is deploying a new submillimeter (submm) VLBI station in
Greenland. Our primary scientific goal is to image a shadow of the supermassive
black hole (SMBH) of six billion solar masses in M87 at the center of the Virgo
cluster of galaxies. The expected SMBH shadow size of 40-50 $\mu$as requires
superbly high angular resolution, suggesting that the submm VLBI would be the
only way to obtain the shadow image. The Summit station in Greenland enables us
to establish baselines longer than 9,000 km with ALMA in Chile and SMA in
Hawaii as well as providing a unique $u$--$v$ coverage for imaging M87. Our
VLBI network will achieve a superior angular resolution of about 20 $\mu$as at
350 GHz, corresponding to $\sim2.5$ times of the Schwarzschild radius of the
supermassive black hole in M87. We have been monitoring the atmospheric opacity
at 230 GHz since August. 2011; we have confirmed the value on site during the
winter season is comparable to the ALMA site thanks to high altitude of 3,200 m
and low temperature of $-50\degr$C. We will report current status and future
plan of the GLT project towards our expected first light on 2015--2016.
