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| ALMA Early Science | |
|---|---|
| Name | Atacama Large Millimeter/submillimeter Array Early Science |
| Location | Atacama Desert, Antofagasta Region |
| Established | 2011 |
| Operator | ALMA Consortium; National Astronomical Observatory of Japan; National Radio Astronomy Observatory; European Southern Observatory |
| Wavelength | Millimeter and submillimeter |
| Antennas | 16–50 (early science configurations) |
ALMA Early Science is the initial scientific observing phase of the Atacama Large Millimeter/submillimeter Array located on the Chajnantor Plateau in the Atacama Desert. It followed construction and commissioning efforts involving institutions such as the National Science Foundation, National Institutes of Natural Sciences, Max Planck Society, National Astronomical Observatory of Japan, and European Southern Observatory, enabling transformative observations across star formation, galaxy evolution, and planetary science. Early Science integrated contributions from projects linked to the Submillimeter Array, Very Large Array, Herschel Space Observatory, Spitzer Space Telescope, and Planck (spacecraft) to establish ALMA's role in multiwavelength astrophysics.
ALMA Early Science began formal operations in 2011 with a subset of the final 66-antenna array, featuring contributions from partners including the National Radio Astronomy Observatory, Joint ALMA Observatory, ESO Public Surveys, Canadian Space Agency, Korea Astronomy and Space Science Institute, and the Chilean Ministry of Economy. The program emphasized open-access observing through competitive proposals from teams such as those led by Riccardo Giovanelli, Andrea Hales, Paola Andreani, Alberto Bolatto, and Roberto Neri. Early Science established pipelines tested against legacy datasets from the James Clerk Maxwell Telescope, IRAM 30m Telescope, Institut de Radioastronomie Millimétrique, and the Nobeyama Radio Observatory.
Commissioning relied on engineering and science verification campaigns organized by the ALMA Project Scientist, Francois Schuller, Stuartt Corder, Mike Dunham, and teams from the Centre National de la Recherche Scientifique, Max Planck Institute for Radio Astronomy, and Associated Universities, Inc.. Array configurations during Early Science ranged from compact to extended baselines comparable to those used by the Very Large Array and Plateau de Bure Interferometer, enabling angular resolution competitive with facilities like the Submillimeter Array. Antenna performance assessments referenced standards from the International Astronomical Union and calibration strategies developed with input from the International VLBI Service and the Astrophysical Journal editorial community.
The program targeted star and planet formation studies linked to teams such as those of Paola Caselli, Alessandro Morbidelli, Caroline Walsh, and Sean Matt. Galaxy evolution projects coordinated with researchers funded by the European Research Council, National Science Foundation grants, and the Royal Society aimed to probe high-redshift systems studied by Hubble Space Telescope, Spitzer Space Telescope, and Chandra X-ray Observatory teams including Christopher Conselice and Ranga-Ram Chary. Solar System investigations engaged scientists from the Jet Propulsion Laboratory, European Space Agency, and the NASA Astrobiology Institute to study bodies observed previously by Cassini–Huygens, Mars Reconnaissance Orbiter, and New Horizons teams. Key Programs included surveys designed by consortia with members from the University of Cambridge, California Institute of Technology, Harvard–Smithsonian Center for Astrophysics, and the Max Planck Society.
Early Science exploited ALMA receivers covering Bands 3, 6, and 7, with correlator modes and spectral setups benchmarked against instruments like those at the Institut de Radioastronomie Millimétrique and the Nobeyama Radio Observatory. Front-end and back-end systems incorporated technology developed by contractors including Thales Alenia Space, Mitsubishi Electric, and Ball Aerospace. Calibration used quasars cataloged by teams at the International Celestial Reference Frame and employed software derived from packages used at the National Radio Astronomy Observatory and the European Southern Observatory. The correlator enabled high spectral resolution studies comparable to those used by Herschel Space Observatory spectrometers and delivered sensitivity improvements over the James Clerk Maxwell Telescope.
Early results included high-resolution images of protoplanetary disks by groups led by André Müller, Ewine van Dishoeck, and Andrea Isella showing disk substructure relevant to theories by Philip Armitage and Paul J. Armitage. Observations of high-redshift galaxies involved teams such as Roberto Maiolino and Fabian Walter, revealing molecular gas reservoirs previously studied by IRAM surveys. Detections of complex organic molecules were reported by researchers connected to the Max Planck Institute for Astronomy and Leiden Observatory, echoing astrochemical work from the ALMA Protostellar Interferometric Line Survey. Solar System imaging of Comet Hale–Bopp analogs and outer planet atmospheres engaged collaborators from NASA centers and the European Southern Observatory. Many findings were published in journals including Nature (journal), Science (journal), and the Astrophysical Journal.
Data reduction used the Common Astronomy Software Applications package, developed by the National Radio Astronomy Observatory in collaboration with the European Southern Observatory and the National Astronomical Observatory of Japan. The ALMA Science Archive was populated with calibrated visibilities and imaging products contributed by teams affiliated with the ALMA Regional Centers in North America, Europe, and East Asia. Archive policies aligned with practices from the Hubble Space Telescope and the European Southern Observatory public archives, supporting Virtual Observatory standards advocated by the International Virtual Observatory Alliance. Data management involved workflows influenced by projects at the European Organization for Nuclear Research and the Max Planck Society computational facilities.
ALMA Early Science catalyzed collaborations across institutions including the National Science Foundation, European Research Council, Japanese Society for the Promotion of Science, Royal Society, and numerous universities such as the University of Tokyo, University of Chile, Princeton University, and University of Oxford. The program influenced instrumentation roadmaps at the Submillimeter Array, Very Large Telescope, and future projects like the Square Kilometre Array and Origins Space Telescope concepts. Its legacy includes training scientists through programs at the European Southern Observatory, National Radio Astronomy Observatory, and Joint ALMA Office, seeding follow-up programs funded by agencies including the National Aeronautics and Space Administration and the European Space Agency.