Greenland Telescope

Greenland Telescope
In July 2017, the Greenland Telescope has been re-assembled in Greenland
Location(s) Greenland Edit this at Wikidata
Coordinates 72°35′N 38°25′W / 72.58°N 38.42°W / 72.58; -38.42Coordinates: 72°35′N 38°25′W / 72.58°N 38.42°W / 72.58; -38.42 Edit this at Wikidata
Altitude 3,210 m (10,530 ft) Edit this at Wikidata
First light 25 December 2017 Edit this on Wikidata
Telescope style Radio telescope Edit this on Wikidata
Diameter 12 m (39 ft 4 in) Edit this at Wikidata
Website www.cfa.harvard.edu/greenland12m/ Edit this at Wikidata
Location of Greenland Telescope

The Greenland Telescope is a radio telescope and an international collaborating project participated by the (CfA) Smithsonian Astronomical Observatory (US), the National Radio Astronomy Observatory (US) and The (MIT) Haystack Observatory (US), led by the Academia Sinica Institute of Astronomy and Astrophysics (Taiwan). In 2011, the U.S. National Science Foundation awarded SAO and the team[1] a 12-metre radio antenna (a prototype antenna built for testing specifications purposes for the ALMA project) to deploy and operate in Greenland.

For decades, astrophysicists are preparing to directly observe the immediate surrounding of a black hole with angular resolution comparable to its event horizon. Observing and imaging the event horizons of black holes would be extremely important to the studies such as General Relativity in the strong field regime, the accretion and outflow processes at the edge of a black hole, the existence of an event horizon, and fundamental black hole physics, e.g. spin.[2]

The purposes of this Greenland Telescope and the associated project are "to provide direct confirmation of a Super Massive Black Hole by observing its shadow image[3]" and to explore an origin of the relativistic jet in the active galaxy M87.[4][5][6][7]

Progress and Current Status

During 2013 to 2015, after some retrofitting work completed to prepare it for Arctic weather, the ASIAA team shipped the antenna to Greenland in July 2016 and re-assembled it in July 2017, near Thule Air Base.[8] The telescope achieved first light on December 25, 2017, using an artificial light source on South Mountain at Thule Air Base.[9][10]

References

  1. ↑ "Greenland Telescope Project". www.cfa.harvard.edu. Retrieved 2018-01-17.
  2. ↑ "ASIAA - The Greenland Telescope and Submillimeter VLBI". www.asiaa.sinica.edu.tw. Retrieved 2018-03-02.
  3. ↑ "Greenland Telescope Project --- Direct Confirmation of Black Hole with Sub-millimeter VLBI". Retrieved 2018-01-29.
  4. ↑ "M87 Workshop: Towards the 100th Anniversary of the Discovery of Cosmic Jets". events.asiaa.sinica.edu.tw. Retrieved 2018-03-01.
  5. ↑ Asada, Keiichi; Nakamura, Masanori (2012-02-01). "The Structure of the M87 Jet: A Transition from Parabolic to Conical Streamlines". The Astrophysical Journal Letters. 745: L28. arXiv:1110.1793. Bibcode:2012ApJ...745L..28A. doi:10.1088/2041-8205/745/2/L28. ISSN 0004-637X.
  6. ↑ Nakamura, Masanori; Asada, Keiichi (2013-10-01). "The Parabolic Jet Structure in M87 as a Magnetohydrodynamic Nozzle". The Astrophysical Journal. 775: 118. arXiv:1308.1436. Bibcode:2013ApJ...775..118N. doi:10.1088/0004-637X/775/2/118. ISSN 0004-637X.
  7. ↑ Asada, Keiichi; Nakamura, Masanori; Pu, Hung-Yi (2016-12-01). "Indication of the Black Hole Powered Jet in M87 by VSOP Observations". The Astrophysical Journal. 833: 56. Bibcode:2016ApJ...833...56A. doi:10.3847/1538-4357/833/1/56. ISSN 0004-637X.
  8. ↑ "Thule Air Base". Retrieved January 29, 2018.
  9. ↑ https://twitter.com/NSF_OPP/status/943856666692538369
  10. ↑ https://www.cfa.harvard.edu/greenland12m/images/GLT-FirstLight.pdf

Additional sources

  • Hirashita, Hiroyuki; Koch, Patrick M.; Matsushita, Satoki; Takakuwa, Shigehisa; Nakamura, Masanori; Asada, Keiichi; Liu, Hauyu Baobab; Urata, Yuji; Wang, Ming-Jye; Wang, Wei-Hao; Takahashi, Satoko; Tang, Ya-Wen; Chang, Hsian-Hong; Huang, Kuiyun; Morata, Oscar; Otsuka, Masaaki; Lin, Kai-Yang; Tsai, An-Li; Lin, Yen-Ting; Srinivasan, Sundar; Martin-Cocher, Pierre; Pu, Hung-Yi; Kemper, Francisca; Patel, Nimesh; Grimes, Paul; Huang, Yau-De; Han, Chih-Chiang; Huang, Yen-Ru; Nishioka, Hiroaki; Lin, Lupin Chun-Che; Zhang, Qizhou; Keto, Eric; Burgos, Roberto; Chen, Ming-Tang; Inoue, Makoto; Ho, Paul T. P.. "First-generation science cases for ground-based terahertz telescopes". Publications of the Astronomical Society of Japan, 2016: Volume 68, Issue 1, id.R1 pp. |doi=10.1093/pasj/psv115
  • The M87 Workshop: Towards the 100th Anniversary of the Discovery of Cosmic Jets
  • Urata, Yuji; Huang, Kuiyun; Asada, Keiichi; Hirashita, Hiroyuki; Inoue, Makoto; Ho, Paul T. P. (2015). "A New Era of Submillimeter GRB Afterglow Follow-Ups with the Greenland Telescope". Advances in Astronomy. 2015: 1–12. arXiv:1503.07594. Bibcode:2015AdAst2015E..12U. doi:10.1155/2015/165030.
The Greenland Telescope in polar night, 2017
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