Status of scientific commissioning of the Greenland Telescope

Jun Yi Koay*, Satoki Matsushita, Keiichi Asada, Nimesh A. Patel, Chih Wei L. Huang, Geoffrey Bower, Shu Hao Chang, Ming Tang Chen, Chung Cheng Chen, Ryan Chilson, Chih Chiang Han, Paul T.P. Ho, Yau De Huang, Makoto Inoue, Homin Jiang, Patrick M. Koch, Shoko Koyama, Cheng Yu Kuo, Derek Kubo, Chao Te LiChing Tang Liu, Kuan Yu Liu, Wen Ping Lo, Pierre Martin-Cocher, Masanori Nakamura, Timothy J. Norton, George Nystrom, Peter Oshiro, Jongho Park, Hung Yi Pu, Philippe Raffin, Ramprasad Rao, Cristina Romero-Cañizales, Paul Shaw, Tirupati K. Sridharan, Ranjani Srinivasan, Ta Shun Wei, Chen Yu Yu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The Greenland Telescope (GLT), currently located at Thule Air Base, is a 12-m single dish telescope operating at frequencies of 86, 230 and 345 GHz. Since April 2018, the GLT has regularly participated in (sub-)mm VLBI observations of supermassive black holes as part of the Event Horizon Telescope (EHT) and the Global mm VLBI Array (GMVA). We present the status of scientific commissioning activities at the GLT, including most recently the 345 GHz first light and test observations. The antenna surface accuracy has been improved to ∼25 microns through panel adjustments aided by photogrammetry, significantly increasing the antenna efficiency. Through all-sky spectral line pointing observations (SiO masers at 86 GHz and CO at 230 and 345 GHz), we have improved the radio pointing accuracy down to <∼ 3"at all 3 frequencies. Due to the pandemic, we are in the process of transitioning GLT commissioning and observing activities to remote operations.

Original languageEnglish
Title of host publicationGround-Based and Airborne Telescopes VIII
EditorsHeather K. Marshall, Jason Spyromilio, Tomonori Usuda
PublisherSPIE
ISBN (Electronic)9781510636774
DOIs
Publication statusPublished - 2020
EventGround-Based and Airborne Telescopes VIII 2020 - Virtual, Online, United States
Duration: 2020 Dec 142020 Dec 22

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11445
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceGround-Based and Airborne Telescopes VIII 2020
Country/TerritoryUnited States
CityVirtual, Online
Period2020/12/142020/12/22

Keywords

  • Commissioning
  • Greenland Telescope
  • Submillimeter-Wave
  • Supermassive black hole
  • Very Long Baseline Interferometry (VLBI)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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