Related papers: Electronics Instrumentation for the Greenland Tele…

Greenland Telescope Project --- Direct Confirmation of Black Hole with Sub-millimeter VLBI

A 12-m diameter radio telescope will be deployed to the Summit Station in Greenland to provide direct confirmation of a Super Massive Black Hole (SMBH) by observing its shadow image in the active galaxy M87. The telescope (Greenland…

Instrumentation and Methods for Astrophysics · Physics 2015-06-22 M. Inoue , J. C. Algaba-Marcos , K. Asada , C. -C. Chang , M. -T. Chen , J. Han , H. Hirashita , P. T. P. Ho , S. -N. Hsieh , T. Huang , H. Jiang , P. M. Koch , D. Y. Kubo , C. -Y. Kuo , B. Liu , P. Martin-Cocher , S. Matsushita , Z. Meyer-Zhao , M. Nakamura , H. Nishioka , G. Nystrom , N. Pradel , H. -Y. Pu , P. A. Raffin , H. -Y. Shen , W. Snow , R. Srinivasan , T. -S. Wei , R. Blundell , R. Burgos , P. Grimes , E. Keto , S. Paine , N. Patel , T. K. Sridharan , S. S. Doeleman , V. Fish , W. Brisken , P. Napier

Greenland Telescope (GLT) Project: "A Direct Confirmation of Black Hole with Submillimeter VLBI"

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 billion solar masses in M87 at the center of the Virgo cluster…

Instrumentation and Methods for Astrophysics · Physics 2015-06-17 M. Nakamura , J. -C. Algaba , K. Asada , B. Chen , M. -T. Chen , J. Han , P. H. P. Ho , S. -N. Hsieh , T. Huang , M. Inoue , P. Koch , C. -Y. Kuo , P. Martin-Cocher , S. Matsushita , Z. Meyer-Zhao , H. Nishioka , G. Nystom , N. Pradel , H. -Y. Pu , P. Raffin , H. -Y. Shen , C. -Y. Tseng , the Greenland Telescope Project Team

3.5-Year Monitoring of 225 GHz Opacity at the Summit of Greenland

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 chose this site as our submillimeter telescope (Greenland…

Instrumentation and Methods for Astrophysics · Physics 2017-01-12 Satoki Matsushita , Keiichi Asada , Pierre L. Martin-Cocher , Ming-Tang Chen , Paul T. P. Ho , Makoto Inoue , Patrick M. Koch , Scott N. Paine , David D. Turner

The Greenland Telescope (GLT): Antenna status and future plans

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 (ASIAA), SAO's main partner for this project, are working…

Instrumentation and Methods for Astrophysics · Physics 2015-06-22 Philippe Raffin , Juan Carlos Algaba-Marcos , Keichi Asada , Raymond Blundell , Roberto Burgos , Chih-Cheng Chang , Ming-Tang Chen , Robert Christensen , Paul K. Grimes , C. C. Han , Paul T. P. Ho , Yau-De Huang , Makoto Inoue , Patrick M. Koch , Derek Kubo , Steve Leiker , Ching-Tang Liu , Pierre Martin-Cocher , Satoki Matsushita , Masanori Nakamura , Hiroaki Nishioka , George Nystrom , Scott N. Paine , Nimesh A. Patel , Nicolas Pradel , Hung-Yi Pu , H. -Y. Shen , William Snow , T. K. Sridharan , Ranjani Srinivasan , Edward Tong , Jackie Wang

In situ, broadband measurement of the radio frequency attenuation length at Summit Station, Greenland

Over the last 25 years, radiowave detection of neutrino-generated signals, using cold polar ice as the neutrino target, has emerged as perhaps the most promising technique for detection of extragalactic ultra-high energy neutrinos…

Instrumentation and Methods for Astrophysics · Physics 2022-08-03 J. A. Aguilar , P. Allison , J. J. Beatty , D. Besson , A. Bishop , O. Botner , S. Bouma , S. Buitink , M. Cataldo , B. A. Clark , Z. Curtis-Ginsberg , A. Connolly , P. Dasgupta , S. de Kockere , K. D. de Vries , C. Deaconu , M. A. DuVernois , C. Glaser , A. Hallgren , S. Hallmann , J. C. Hanson , B. Hendricks , C. Hornhuber , K. Hughes , A. Karle , J. L. Kelley , I. Kravchenko , R. Krebs , R. Lahmann , U. Latif , J. Mammo , Z. S. Meyers , K. Michaels , K. Mulrey , A. Nelles , A. Novikov , A. Nozdrina , E. Oberla , B. Oeyen , Y. Pan , H. Pandya , I. Plaisier , N. Punsuebsay , L. Pyras , D. Ryckbosch , O. Scholten , D. Seckel , M. F. H. Seikh , D. Smith , D. Southall , J. Torres , S. Toscano , D. Tosi , D. J. Van Den Broeck , N. van Eijndhoven , A. G. Vieregg , C. Welling , D. R. Williams , S. Wissel , R. Young , A. Zink

An in situ measurement of the radio-frequency attenuation in ice at Summit Station, Greenland

We report an in situ measurement of the electric field attenuation length at radio frequencies for the bulk ice at Summit Station, Greenland, made by broadcasting radio-frequency signals vertically through the ice and measuring the relative…

Instrumentation and Methods for Astrophysics · Physics 2015-12-03 J. Avva , J. M. Kovac , C. Miki , D. Saltzberg , A. G. Vieregg

A new era of sub-millimeter GRB afterglow follow-ups with the Greenland Telescope

A planned rapid submillimeter (submm) Gamma Ray Burst (GRBs) follow-up observations conducted using the Greenland Telescope (GLT) is presented. The GLT is a 12-m submm telescope to be located at the top of the Greenland ice sheet, where the…

High Energy Astrophysical Phenomena · Physics 2015-09-23 Yuji Urata , Kuiyun Huang , Keiichi Asada , Hiroyuki Hirashita , Makoto Inoue , Paul T. P. Ho

Precision measurement of the index of refraction of deep glacial ice at radio frequencies at Summit Station, Greenland

Glacial ice is used as a target material for the detection of ultra-high energy neutrinos, by measuring the radio signals that are emitted when those neutrinos interact in the ice. Thanks to the large attenuation length at radio…

Instrumentation and Methods for Astrophysics · Physics 2023-04-14 J. A. Aguilar , P. Allison , D. Besson , A. Bishop , O. Botner , S. Bouma , S. Buitink , W. Castiglioni , M. Cataldo , B. A. Clark , A. Coleman , K. Couberly , Z. Curtis-Ginsberg , P. Dasgupta , S. de Kockere , K. D. de Vries , C. Deaconu , M. A. DuVernois , A. Eimer , C. Glaser , A. Hallgren , S. Hallmann , J. C. Hanson , B. Hendricks , J. Henrichs , N. Heyer , C. Hornhuber , K. Hughes , T. Karg , A. Karle , J. L. Kelley , M. Korntheuer , M. Kowalski , I. Kravchenko , R. Krebs , R. Lahmann , P. Lehmann , U. Latif , P. Laub , C. H. Liu , J. Mammo , M. J. Marsee , Z. S. Meyers , K. Michaels , K. Mulrey , M. Muzio , A. Nelles , A. Novikov , A. Nozdrina , E. Oberla , B. Oeyen , I. Plaisier , N. Punsuebsay , L. Pyras , D. Ryckbosch , F. Schlüter , O. Scholten , D. Seckel , M. F. H. Seikh , D. Smith , J. Stoffels , D. Southall , K. Terveer , S. Toscano , D. Tosi , D. J. Van Den Broeck , N. van Eijndhoven , A. G. Vieregg , J. Z. Vischer , C. Welling , D. R. Williams , S. Wissel , R. Young , A. Zink

Absolute Flux Density Calibration of the Greenland Telescope Data for Event Horizon Telescope Observations

Starting from the observing campaign in April 2018, the Greenland Telescope (GLT) has been added as a new station of the Event Horizon Telescope (EHT) array. Visibilities on baselines to the GLT, particularly in the North-South direction,…

Instrumentation and Methods for Astrophysics · Physics 2023-12-06 J. Y. Koay , K. Asada , S. Matsushita , C. -Y. Kuo , C. -W. L. Huang , C. Romero-Cañizales , S. Koyama , J. Park , W. -P. Lo , G. Bower , M. -T. Chen , S. -H. Chang , C. -C. Chen , R. Chilson , C. C. Han , P. T. P. Ho , Y. -D. Huang , M. Inoue , B. Jeter , H. Jiang , P. M. Koch , D. Kubo , C. -T. Li , C. -T. Liu , K. -Y. Liu , P. Martin-Cocher , M. Nakamura , T. J. Norton , G. Nystrom , P. Oshiro , N. Patel , U. -L. Pen , H. -Y Pu , P. A. Raffin , R. Rao , T. K. Sridharan , R. Srinivasan , T. -S Wei

The Greenland Telescope: Construction, Commissioning, and Operations in Pituffik

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 telescope system. This paper presents a full review of the…

Instrumentation and Methods for Astrophysics · Physics 2023-07-21 Ming-Tang Chen , Keiichi Asada , Satoki Matsushita , Philippe Raffin , Makoto Inoue , Paul T. P. Ho , Chih-Chiang Han , Derek Kubo , Timothy Norton , Nimesh A. Patel , George Nystrom , Chih-Wei L. Huang , Pierre Martin-Cocher , Jun Yi Koay , Cristina Romero-Cañizales , Ching-Tang Liu , Teddy Huang , Kuan-Yu Liu , Tashun Wei , Shu-Hao Chang , Ryan Chilson , Peter Oshiro , Homin Jiang , Chao-Te Li , Geoffrey Bower , Paul Shaw , Hiroaki Nishioka , Patrick M. Koch , Chung-Cheng Chen , Ranjani Srinivasan , Ramprasad Rao , William Snow , Hao Jinchi , Kuo-Chang Han , Song-Chu Chang , Li-Ming Lu , Hideo Ogawa , Kimihiro Kimura , Yutaka Hasegawa , Hung-Yi Pu , Shoko Koyama , Masanori Nakamura , Daniel Bintley , Craig Walther , Per Friberg , Jessica Dempsey , T. K. Sriharan , Sivasankaran Srikanth , Sheperd S. Doeleman , Roger Brissenden , Juan-Carlos Algaba Marcos , Britt Jeter , Cheng-Yu Kuo , Jongho Park

225 GHz Atmospheric Opacity Measurements from Two Arctic Sites

We report the latest results of 225 GHz atmospheric opacity measurements from two arctic sites; one on high coastal terrain near the Eureka weather station, on Ellesmere Island, Canada, and the other at the Summit Station near the peak of…

Instrumentation and Methods for Astrophysics · Physics 2015-06-11 S. Matsushita , M. -T. Chen , P. Martin-Cocher , K. Asada , C. -P. Chen , M. Inoue , S. Paine , D. Turner , E. Steinbring

The Greenland Telescope: Antenna Retrofit Status and Future Plans

Since the ALMA North America Prototype Antenna was awarded to the Smithsonian Astrophysical Observatory (SAO), SAO and the Academia Sinica Institute of Astronomy & Astrophysics (ASIAA) are working jointly to relocate the antenna to…

Instrumentation and Methods for Astrophysics · Physics 2016-12-14 Philippe Raffin , Paul T. P. Ho , Keiichi Asada , Raymond Blundell , Geoffrey C. Bower , Roberto Burgos , Chih-Cheng Chang , Ming-Tang Chen , You-Hua Chu , Paul K. Grimes , C. C. Han , Chih-Wei L. Huang , Yau-De Huang , Fang-Chia Hsieh , Makoto Inoue , Patrick M. Koch , Derek Kubo , Steve Leiker , Lupin Lin , Ching-Tang Liu , Shih-Hsiang Lo , Pierre Martin-Cocher , Satoki Matsushita , Masanori Nakamura , Zheng Meyer-Zhao , Hiroaki Nishioka , Tim Norton , George Nystrom , Scott N. Paine , Nimesh A. Patel , Hung-Yi Pu , William Snow , T. K. Sridharan , Ranjani Srinivasan , Jackie Wang

First M87 Event Horizon Telescope Results. III. Data Processing and Calibration

We present the calibration and reduction of Event Horizon Telescope (EHT) 1.3mm radio wavelength observations of the supermassive black hole candidate at the center of the radio galaxy M87 and the quasar 3C 279, taken during the 2017 April…

Astrophysics of Galaxies · Physics 2019-07-08 The Event Horizon Telescope Collaboration

Radiofrequency Ice Dielectric Measurements at Summit Station, Greenland

We recently reported on the radio-frequency attenuation length of cold polar ice at Summit Station, Greenland, based on bistatic radar measurements of radio-frequency bedrock echo strengths taken during the summer of 2021. Those data also…

Instrumentation and Detectors · Physics 2022-12-21 J. A. Aguilar , P. Allison , D. Besson , A. Bishop , O. Botner , S. Bouma , S. Buitink , M. Cataldo , B. A. Clark , K. Couberly , Z. Curtis-Ginsberg , P. Dasgupta , S. de Kockere , K. D. de Vries , C. Deaconu , M. A. DuVernois , A. Eimer , C. Glaser , A. Hallgren , S. Hallmann , J. C. Hanson , B. Hendricks , J. Henrichs , N. Heyer , C. Hornhuber , K. Hughes , T. Karg , A. Karle , J. L. Kelley , M. Korntheuer , M. Kowalski11 , I. Kravchenko , R. Krebs , R. Lahmann , U. Latif , J. Mammo , M. J. Marsee , Z. S. Meyers , K. Michaels , K. Mulrey , M. Muzio , A. Nelles , A. Novikov , A. Nozdrina , E. Oberla , B. Oeyen , I. Plaisier , N. Punsuebsay , L. Pyras , D. Ryckbosch , O. Scholten , D. Seckel , M. F. H. Seikh , D. Smith , J. Stoffels , D. Southall , K. Terveer , S. Toscano , D. Tosi , D. J. Van Den Broeck , N. van Eijndhoven , A. G. Vieregg , J. Z. Vischer , C. Welling , D. R. Williams , S. Wissel , R. Young , A. Zink

A LEKID-based CMB instrument design for large-scale observations in Greenland

We present the results of a feasibility study, which examined deployment of a ground-based millimeter-wave polarimeter, tailored for observing the cosmic microwave background (CMB), to Isi Station in Greenland. The instrument for this study…

Instrumentation and Methods for Astrophysics · Physics 2014-10-13 D. C. Araujo , P. A. R. Ade , J. R. Bond , K. J. Bradford , D. Chapman , G. Che , P. K. Day , J. Didier , S. Doyle , H. K. Eriksen , D. Flanigan , C. E. Groppi , S. N. Hillbrand , B. R. Johnson , G. Jones , M. Limon , A. D. Miller , P. Mauskopf , H. McCarrick , T. Mroczkowski , B. Reichborn-Kjennerud , B. Smiley , J. Sobrin , I. K. Wehus , J. Zmuidzinas

The GBT Beam Shape at 109 GHz

With the installation of the Argus 16-pixel receiver covering 75-115 GHz on the Green Bank Telescope (GBT), it is now possible to characterize the antenna beam at very high frequencies, where the use of the active surface and out-of-focus…

Instrumentation and Methods for Astrophysics · Physics 2017-04-04 David T. Frayer

The Event Horizon Telescope: exploring strong gravity and accretion physics

The Event Horizon Telescope (EHT), a global sub-millimeter wavelength very long baseline interferometry array, is now resolving the innermost regions around the supermassive black holes Sgr A* and M87. Using black hole images from both…

High Energy Astrophysical Phenomena · Physics 2015-06-23 Angelo Ricarte , Jason Dexter

Drilling deep in South Pole Ice

To detect the tiny flux of ultra-high energy neutrinos from active galactic nuclei or from interactions of highest energy cosmic rays with the microwave background photons needs target masses of the order of several hundred cubic…

Instrumentation and Detectors · Physics 2014-10-22 Timo Karg , Rolf Nahnhauer

Wideband 67-116 GHz receiver development for ALMA Band 2

ALMA has been operating since 2011, but has not yet been populated with the full suite of intended frequency bands. In particular, ALMA Band 2 (67-90 GHz) is the final band in the original ALMA band definition to be approved for production.…

Instrumentation and Methods for Astrophysics · Physics 2020-02-21 P. Yagoubov , T. Mroczkowski , V. Belitsky , D. Cuadrado-Calle , F. Cuttaia , G. A. Fuller , J. -D. Gallego , A. Gonzalez , K. Kaneko , P. Mena , R. Molina , R. Nesti , V. Tapia , F. Villa , M. Beltran , F. Cavaliere , J. Ceru , G. E. Chesmore , K. Coughlin , C. De Breuck , M. Fredrixon , D. George , H. Gibson , J. Golec , A. Josaitis , F. Kemper , M. Kotiranta , I. Lapkin , I. Lopez-Fernandez , G. Marconi , S. Mariotti , W. McGenn , J. McMahon , A. Murk , F. Pezzotta , N. Phillips , N. Reyes , S. Ricciardi , M. Sandri , M. Strandberg , L. Terenzi , L. Testi , B. Thomas , Y. Uzawa , D. Vigano , N. Wadefalk

LonGSp: the Gornergrat Longslit Infrared Spectrometer

We present a near-infrared cooled grating spectrometer that has been developed at the Arcetri Astrophysical Observatory for the 1.5 m Infrared Telescope at Gornergrat (TIRGO). The spectrometer is equipped with cooled reflective optics and a…

Astrophysics · Physics 2016-08-30 L. Vanzi , M. Sozzi , G. Marcucci , A. Marconi , F. Mannucci , F. Lisi , L. Hunt , E. Giani , S. Gennari , V. Biliotti , C. Baffa