Greenland telescope (GLT) Project: "a direct confirmation of black hole with submillimeter VLBI"

M. Nakamura, J. C. Algaba, K. Asada, B. Chen, M. T. Chen, J. Han, P. H.P. Ho, S. N. Hsieh, T. Huang, M. Inoue, P. Koch, C. Y. Kuo, P. Martin-Cocher, S. Matsushita, Z. Meyer-Zhao, H. Nishioka, G. Nystrom, N. Pradel, H. Y. Pu, P. RaffinH. Y. Shen, C. Y. Tseng

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


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 μas 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 μas at 350 GHz, corresponding to ∼ 2.5 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 C. We will report current status and future plan of the GLT project towards our expected first light on 2015-2016.

Original languageEnglish
Article number01008
JournalEPJ Web of Conferences
Publication statusPublished - 2013
Externally publishedYes
EventInternational Symposium on the Innermost Regions of Relativistic Jets and Their Magnetic Fields - Granada, Spain
Duration: 2013 Jun 102013 Jun 14

ASJC Scopus subject areas

  • General Physics and Astronomy


Dive into the research topics of 'Greenland telescope (GLT) Project: "a direct confirmation of black hole with submillimeter VLBI"'. Together they form a unique fingerprint.

Cite this