TY - JOUR
T1 - Calibration of ALMA as a Phased Array. ALMA Observations During the 2017 VLBI Campaign
AU - Goddi, C.
AU - Martí-Vidal, I.
AU - Messias, H.
AU - Crew, G. B.
AU - Herrero-Illana, R.
AU - Impellizzeri, V.
AU - Rottmann, H.
AU - Wagner, J.
AU - Fomalont, E.
AU - Matthews, L. D.
AU - Petry, D.
AU - Phillips, N.
AU - Tilanus, R.
AU - Villard, E.
AU - Blackburn, L.
AU - Janssen, M.
AU - Wielgus, M.
N1 - Funding Information:
We are grateful to the MIT-Haystack and MPIfR correlation centers and both the EHTC Correlation and Calibration and Error Analysis working groups for their feedback. This work was partially supported by the ERC Synergy Grant “BlackHoleCam: Imaging the Event Horizon of Black Holes” (Grant 610058) and the black hole Initiative at Harvard University, which is supported by a grant from the John Templeton Foundation. The APP was supported by a Major Research Instrumentation award from the National Science Foundation (award 1126433), an ALMA North American Development Augmentation award, ALMA North America (NA) Cycle 3 and Cycle 4 Study awards, an ALMA NA Cycle-5 Development award, a Toray Science and Technology Grant through the Toray Science Foundation of Japan, and a Grant-in-Aid for Scientific Research on Innovative Areas (25120007), provided by the Japan Society for the Promotion of Science and the Ministry of Education, Culture, Sports, Science and Technology (JSPS/MeXT). Work at MIT Haystack was supported by NSF award AST-1440254. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS
Publisher Copyright:
© 2019. The Astronomical Society of the Pacific. All rights reserved.
PY - 2019/7
Y1 - 2019/7
N2 - We present a detailed description of the special procedures for calibration and quality assurance of Atacama Large Millimeter/submillimeter Array (ALMA) observations in Very Long Baseline Interferometry (VLBI) mode. These procedures are required to turn the phased ALMA array into a fully calibrated VLBI station. As an illustration of these methodologies, we present full-polarization observations carried out with ALMA as a phased array at 3mm (Band 3) and 1.3mm (Band 6) as part of Cycle-4. These are the first VLBI science observations conducted with ALMA and were obtained during a 2017 VLBI campaign in concert with other telescopes worldwide as part of the Global mm-VLBI Array (GMVA, April 1–3) and the Event Horizon Telescope (EHT, April 5–11) in ALMA Bands 3 and 6, respectively.
AB - We present a detailed description of the special procedures for calibration and quality assurance of Atacama Large Millimeter/submillimeter Array (ALMA) observations in Very Long Baseline Interferometry (VLBI) mode. These procedures are required to turn the phased ALMA array into a fully calibrated VLBI station. As an illustration of these methodologies, we present full-polarization observations carried out with ALMA as a phased array at 3mm (Band 3) and 1.3mm (Band 6) as part of Cycle-4. These are the first VLBI science observations conducted with ALMA and were obtained during a 2017 VLBI campaign in concert with other telescopes worldwide as part of the Global mm-VLBI Array (GMVA, April 1–3) and the Event Horizon Telescope (EHT, April 5–11) in ALMA Bands 3 and 6, respectively.
KW - (galaxies:) quasars: general
KW - astronomical databases: miscellaneous
KW - instrumentation: interferometers
KW - methods: data analysis
KW - methods: observational
KW - submillimeter: galaxies
KW - submillimeter: general
KW - surveys
KW - techniques: high angular resolution
KW - techniques: interferometric
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U2 - 10.1088/1538-3873/ab136a
DO - 10.1088/1538-3873/ab136a
M3 - Article
AN - SCOPUS:85064450814
VL - 131
JO - Publications of the Astronomical Society of the Pacific
JF - Publications of the Astronomical Society of the Pacific
SN - 0004-6280
IS - 1001
M1 - 075003
ER -