Calibration of ALMA as a Phased Array. ALMA Observations During the 2017 VLBI Campaign

C. Goddi, I. Martí-Vidal, H. Messias, G. B. Crew, R. Herrero-Illana, V. Impellizzeri, H. Rottmann, J. Wagner, E. Fomalont, L. D. Matthews, D. Petry, N. Phillips, R. Tilanus, E. Villard, L. Blackburn, M. Janssen, M. Wielgus

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


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.

Original languageEnglish (US)
Article number075003
JournalPublications of the Astronomical Society of the Pacific
Issue number1001
StatePublished - Jul 2019
Externally publishedYes


  • (galaxies:) quasars: general
  • astronomical databases: miscellaneous
  • instrumentation: interferometers
  • methods: data analysis
  • methods: observational
  • submillimeter: galaxies
  • submillimeter: general
  • surveys
  • techniques: high angular resolution
  • techniques: interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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