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-Cañizales; Paul Shaw; Tirupati K. Sridharan; Ranjani Srinivasan; Ta Shun Wei; Chen Yu Yu

doi:10.1117/12.2561491

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

Department of Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

5 Citations (Scopus)

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 language	English
Title of host publication	Ground-Based and Airborne Telescopes VIII
Editors	Heather K. Marshall, Jason Spyromilio, Tomonori Usuda
Publisher	SPIE
ISBN (Electronic)	9781510636774
DOIs	https://doi.org/10.1117/12.2561491
Publication status	Published - 2020
Event	Ground-Based and Airborne Telescopes VIII 2020 - Virtual, Online, United States Duration: 2020 Dec 14 → 2020 Dec 22

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	11445
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Ground-Based and Airborne Telescopes VIII 2020
Country/Territory	United States
City	Virtual, Online
Period	2020/12/14 → 2020/12/22

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

Access to Document

10.1117/12.2561491

Cite this

Koay, J. Y., Matsushita, S., Asada, K., Patel, N. A., Huang, C. W. L., Bower, G., Chang, S. H., Chen, M. T., Chen, C. C., Chilson, R., Han, C. C., Ho, P. T. P., Huang, Y. D., Inoue, M., Jiang, H., Koch, P. M., Koyama, S., Kuo, C. Y., Kubo, D., ... Yu, C. Y. (2020). Status of scientific commissioning of the Greenland Telescope. In H. K. Marshall, J. Spyromilio, & T. Usuda (Eds.), Ground-Based and Airborne Telescopes VIII Article 114450Q (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11445). SPIE. https://doi.org/10.1117/12.2561491

Status of scientific commissioning of the Greenland Telescope. / Koay, Jun Yi; Matsushita, Satoki; Asada, Keiichi et al.
Ground-Based and Airborne Telescopes VIII. ed. / Heather K. Marshall; Jason Spyromilio; Tomonori Usuda. SPIE, 2020. 114450Q (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11445).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Koay, JY, Matsushita, S, Asada, K, Patel, NA, Huang, CWL, Bower, G, Chang, SH, Chen, MT, Chen, CC, Chilson, R, Han, CC, Ho, PTP, Huang, YD, Inoue, M, Jiang, H, Koch, PM, Koyama, S, Kuo, CY, Kubo, D, Li, CT, Liu, CT, Liu, KY, Lo, WP, Martin-Cocher, P, Nakamura, M, Norton, TJ, Nystrom, G, Oshiro, P, Park, J, Pu, HY, Raffin, P, Rao, R, Romero-Cañizales, C, Shaw, P, Sridharan, TK, Srinivasan, R, Wei, TS & Yu, CY 2020, Status of scientific commissioning of the Greenland Telescope. in HK Marshall, J Spyromilio & T Usuda (eds), Ground-Based and Airborne Telescopes VIII., 114450Q, Proceedings of SPIE - The International Society for Optical Engineering, vol. 11445, SPIE, Ground-Based and Airborne Telescopes VIII 2020, Virtual, Online, United States, 2020/12/14. https://doi.org/10.1117/12.2561491

@inproceedings{7a2b21b6efcc40e1b92013625cc88e3b,

title = "Status of scientific commissioning of the Greenland Telescope",

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.",

keywords = "Commissioning, Greenland Telescope, Submillimeter-Wave, Supermassive black hole, Very Long Baseline Interferometry (VLBI)",

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

note = "Publisher Copyright: {\textcopyright} COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.; Ground-Based and Airborne Telescopes VIII 2020 ; Conference date: 14-12-2020 Through 22-12-2020",

year = "2020",

doi = "10.1117/12.2561491",

language = "English",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

publisher = "SPIE",

editor = "Marshall, {Heather K.} and Jason Spyromilio and Tomonori Usuda",

booktitle = "Ground-Based and Airborne Telescopes VIII",

}

TY - GEN

T1 - Status of scientific commissioning of the Greenland Telescope

AU - Koay, Jun Yi

AU - Matsushita, Satoki

AU - Asada, Keiichi

AU - Patel, Nimesh A.

AU - Huang, Chih Wei L.

AU - Bower, Geoffrey

AU - Chang, Shu Hao

AU - Chen, Ming Tang

AU - Chen, Chung Cheng

AU - Chilson, Ryan

AU - Han, Chih Chiang

AU - Ho, Paul T.P.

AU - Huang, Yau De

AU - Inoue, Makoto

AU - Jiang, Homin

AU - Koch, Patrick M.

AU - Koyama, Shoko

AU - Kuo, Cheng Yu

AU - Kubo, Derek

AU - Li, Chao Te

AU - Liu, Ching Tang

AU - Liu, Kuan Yu

AU - Lo, Wen Ping

AU - Martin-Cocher, Pierre

AU - Nakamura, Masanori

AU - Norton, Timothy J.

AU - Nystrom, George

AU - Oshiro, Peter

AU - Park, Jongho

AU - Pu, Hung Yi

AU - Raffin, Philippe

AU - Rao, Ramprasad

AU - Romero-Cañizales, Cristina

AU - Shaw, Paul

AU - Sridharan, Tirupati K.

AU - Srinivasan, Ranjani

AU - Wei, Ta Shun

AU - Yu, Chen Yu

PY - 2020

Y1 - 2020

N2 - 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.

AB - 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.

KW - Commissioning

KW - Greenland Telescope

KW - Submillimeter-Wave

KW - Supermassive black hole

KW - Very Long Baseline Interferometry (VLBI)

UR - http://www.scopus.com/inward/record.url?scp=85099786228&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85099786228&partnerID=8YFLogxK

U2 - 10.1117/12.2561491

DO - 10.1117/12.2561491

M3 - Conference contribution

AN - SCOPUS:85099786228

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Ground-Based and Airborne Telescopes VIII

A2 - Marshall, Heather K.

A2 - Spyromilio, Jason

A2 - Usuda, Tomonori

PB - SPIE

T2 - Ground-Based and Airborne Telescopes VIII 2020

Y2 - 14 December 2020 through 22 December 2020

ER -

Status of scientific commissioning of the Greenland Telescope

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this