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The Greenland Telescope: Construction, Commissioning, and Operations in Pituffik
Ming-Tang Chen, Keiichi Asada, Satoki Matsushita +51
In 2018, the Greenland Telescope (GLT) started scientific observation in Greenland. Since then, we have completed several significant improvements and added new capabilities to the…
Implementing Remote Observing at the JCMT
Harriet Parsons, Jessica Dempsey, Dan Bintley +18
The James Clerk Maxwell Telescope (JCMT) is the largest single dish telescope in the world focused on sub-millimeter astronomy - and it remains at the forefront of sub-millimeter d…
Commissioning of Namakanui on the JCMT
Izumi Mizuno, Per Friberg, Ryan Berthold +39
Namakanui is an instrument containing three inserts in an ALMA type Dewar. The three inserts are Alaihi, Uu and Aweoweo operating around 86, 230 and 345GHz. The receiver is being c…
SYMBA: An end-to-end VLBI synthetic data generation pipeline
F. Roelofs, M. Janssen, I. Natarajan +203
Realistic synthetic observations of theoretical source models are essential for our understanding of real observational data. In using synthetic data, one can verify the extent to…
First M87 Event Horizon Telescope Results. II. Array and Instrumentation
The Event Horizon Telescope Collaboration
The Event Horizon Telescope (EHT) is a very long baseline interferometry (VLBI) array that comprises millimeter- and submillimeter-wavelength telescopes separated by distances comp…
Electronics Instrumentation for the Greenland Telescope
Derek Kubo, Chih-Chiang Han, Hiroaki Nishioka +37
The Greenland Telescope project has recently participated in an experiment to image the supermassive black hole shadow at the center of M87 using Very Long Baseline Interferometry…
The ALMA Phasing System: A Beamforming Capability for Ultra-High-Resolution Science at (Sub)Millimeter Wavelengths
L. D. Matthews, G. B. Crew, S. S. Doeleman +38
The Atacama Millimeter/submillimeter Array (ALMA) Phasing Project (APP) has developed and deployed the hardware and software necessary to coherently sum the signals of individual A…
The Hyper Suprime-Cam SSP Survey: Overview and Survey Design
H. Aihara, N. Arimoto, R. Armstrong +139
Hyper Suprime-Cam (HSC) is a wide-field imaging camera on the prime focus of the 8.2m Subaru telescope on the summit of Maunakea in Hawaii. A team of scientists from Japan, Taiwan…
The Greenland Telescope: Antenna Retrofit Status and Future Plans
Philippe Raffin, Paul T. P. Ho, Keiichi Asada +32
Since the ALMA North America Prototype Antenna was awarded to the Smithsonian Astrophysical Observatory (SAO), SAO and the Academia Sinica Institute of Astronomy & Astrophysics (AS…
The Atacama Large Millimeter/submillimeter Array (ALMA) Band-1 Receiver
Yau De Huang, Oscar Morata, Patrick Michel Koch +29
The Atacama Large Millimeter/submillimeter Array(ALMA) Band 1 receiver covers the 35-50 GHz frequency band. Development of prototype receivers, including the key components and sub…
3.5-Year Monitoring of 225 GHz Opacity at the Summit of Greenland
Satoki Matsushita, Keiichi Asada, Pierre L. Martin-Cocher +6
We present the 3.5-yr monitoring results of 225 GHz opacity at the summit of the Greenland ice sheet (Greenland Summit Camp) at an altitude of 3200 m using a tipping radiometer. We…
The Greenland Telescope (GLT): Antenna status and future plans
Philippe Raffin, Juan Carlos Algaba-Marcos, Keichi Asada +29
The ALMA North America Prototype Antenna was awarded to the Smithsonian Astrophysical Observatory (SAO) in 2011. SAO and the Academia Sinica Institute of Astronomy & Astrophysics (…
Greenland Telescope (GLT) Project: "A Direct Confirmation of Black Hole with Submillimeter VLBI"
M. Nakamura, J. -C. Algaba, K. Asada +20
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 bi…
ALMA Nutator Design and Preliminary Performance
Pierre Martin-Cocher, John Ford, Patrick M. Koch +7
We report the past two years of collaboration between the different actors on the ALMA nutator. Building on previous developments, the nutator has seen changes in much of the desig…
Platform Deformation Phase Correction for the AMiBA-13 Co-planar Interferometer
Yu-Wei Liao, Kai-Yang Lin, Yau-De Huang +17
We present a new way to solve the platform deformation problem of co-planar interferometers. The platform of a co-planar interferometer can be deformed due to driving forces and gr…
The metrology cameras for Subaru PFS and FMOS
Shiang-Yu Wang, Yen-Shan Hu, Chi-Hung Yan +11
The Prime Focus Spectrograph (PFS) is a new multi-fiber spectrograph on Subaru telescope. PFS will cover around 1.4 degree diameter field with ~2400 fibers. To ensure precise posit…
Prime Focus Spectrograph - Subaru's future -
Hajime Sugai, Hiroshi Karoji, Naruhisa Takato +51
The Prime Focus Spectrograph (PFS) of the Subaru Measurement of Images and Redshifts (SuMIRe) project has been endorsed by Japanese community as one of the main future instruments…
1.2 Meter Shielded Cassegrain Antenna for Close-Packed Radio Interferometer
Patrick M. Koch, Philippe Raffin, Yau-De Huang +17
Interferometric millimeter observations of the cosmic microwave background and clusters of galaxies with arcmin resolutions require antenna arrays with short spacings. Having all a…
Platform Deformation Refined Pointing and Phase Correction for the AMiBA Hexapod Telescope
Patrick M. Koch, Michael Kesteven, Yu-Yen Chang +26
The Array for Microwave Background Anisotropy (AMiBA) is a radio interferometer for research in cosmology, currently operating 7 0.6m diameter antennas co-mounted on a 6m diameter…
AMiBA: System Performance
Kai-Yang Lin, Chao-Te Li, Paul T. P. Ho +29
The Y.T. Lee Array for Microwave Background Anisotropy (AMiBA) started scientific operation in early 2007. This work describes the optimization of the system performance for the me…