Calibration of ALMA as a phased array: ALMA observations during the 2017 VLBI campaign

Ciriaco Goddi , Ivan Marti-Vidal , Hugo Messias , Geoff Crew , Ruben Herrero-Illana , Violette Impellizzeri , Helge Rottmann , Jan Wagner

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Ed Fomalont Lynn D. Matthews Dirk Petry Neil Phillips Remo Tilanus Eric Villard Lindy Blackburn Michael Jan{\ss}en Maciek Wielgus

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classification 🌌 astro-ph.IM

keywords almaarrayvlbiobservationsphasedaprilbandcalibration

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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.

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Calibration of ALMA as a phased array: ALMA observations during the 2017 VLBI campaign

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