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 Li; Ching-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-Canizales; Paul Shaw; Tirupati K. Sridharan; Ranjani Srinivasan; Ta-Shun Wei; Chen-Yu Yu

doi:10.1117/12.2561491

13 December 2020 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 Li, Ching-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-Canizales, Paul Shaw, Tirupati K. Sridharan, Ranjani Srinivasan, Ta-Shun Wei, Chen-Yu Yu

Author Affiliations +

Proceedings Volume 11445, Ground-based and Airborne Telescopes VIII; 114450Q (2020) https://doi.org/10.1117/12.2561491
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

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.

Conference Presentation

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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 Li, Ching-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-Canizales, Paul Shaw, Tirupati K. Sridharan, Ranjani Srinivasan, Ta-Shun Wei, and Chen-Yu Yu "Status of scientific commissioning of the Greenland Telescope", Proc. SPIE 11445, Ground-based and Airborne Telescopes VIII, 114450Q (13 December 2020); https://doi.org/10.1117/12.2561491

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