Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
Volume 130, Issue 983, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1538-3873/aa9c3d
Keywords
instrumentation: high angular resolution; instrumentation: interferometers; methods: observational
Categories
Funding
- Major Research Instrumentation award from National Science Foundation [1126433]
- ALMA North American Development Augmentation award
- ALMA North American Cycle 3 award
- ALMA North American Cycle 4 award
- Toray Science and Technology Grant through Toray Science Foundation of Japan
- Japan Society for the Promotion of Science [25120007]
- Ministry of Education, Culture, Sports, Science and Technology (JSPS/MeXT)
- NRAO projects [BM434, BM452]
- Grants-in-Aid for Scientific Research [15K21718] Funding Source: KAKEN
- Division Of Astronomical Sciences [1126433] Funding Source: National Science Foundation
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The Atacama Millimeter/submillimeter Array (ALMA) Phasing Project (APP) has developed and deployed the hardware and software necessary to coherently sum the signals of individual ALMA antennas and record the aggregate sum in Very Long Baseline Interferometry (VLBI) Data Exchange Format. These beamforming capabilities allow the ALMA array to collectively function as the equivalent of a single large aperture and participate in global VLBI arrays. The inclusion of phased ALMA in current VLBI networks operating at (sub) millimeter wavelengths provides an order of magnitude improvement in sensitivity, as well as enhancements in u-v coverage and north-south angular resolution. The availability of a phased ALMA enables a wide range of new ultra-high angular resolution science applications, including the resolution of supermassive black holes on event horizon scales and studies of the launch and collimation of astrophysical jets. It also provides a high-sensitivity aperture that may be used for investigations such as pulsar searches at high frequencies. This paper provides an overview of the ALMA Phasing System design, implementation, and performance characteristics.
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