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

Academic Article


  • 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.
  • Authors

    Digital Object Identifier (doi)

    Author List

  • Goddi C; Martí-Vidal I; Messias H; Crew GB; Herrero-Illana R; Impellizzeri V; Rottmann H; Wagner J; Fomalont E; Matthews LD
  • Volume

  • 131
  • Issue

  • 1001