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| Atacama Submillimeter Telescope Experiment | |
|---|---|
| Name | Atacama Submillimeter Telescope Experiment |
| Location | Chajnantor Plateau, Antofagasta Region, Chile |
| Altitude | 4,800 m |
| Established | 2003 |
| Type | Radio telescope (submillimeter) |
| Diameter | 10 m |
| Operator | Nobeyama Radio Observatory / National Astronomical Observatory of Japan |
Atacama Submillimeter Telescope Experiment
The Atacama Submillimeter Telescope Experiment is a 10‑metre submillimeter telescope located on the Chajnantor Plateau in northern Chile. It was developed by the Nobeyama Radio Observatory and the National Astronomical Observatory of Japan to perform continuum and spectral-line observations in the submillimeter regime, contributing to studies of star formation, molecular clouds, and high‑redshift galaxies. The facility has interfaced with international programs and observatories to enhance surveys of the interstellar medium and cosmological background sources.
The project provides a platform for submillimeter astronomy comparable in purpose to instruments at Mauna Kea Observatory, Atacama Large Millimeter/submillimeter Array, James Clerk Maxwell Telescope, Submillimeter Array, and IRAM facilities. Its capabilities complement survey work from space missions such as Herschel Space Observatory and Planck (spacecraft), and ground‑based projects like ALMA, APEX, and South Pole Telescope. The telescope supports instrumentation development in cooperation with institutions including Nobeyama Radio Observatory, National Astronomical Observatory of Japan, University of Tokyo, Osaka University, and international partners such as U.S. National Radio Astronomy Observatory and European Southern Observatory.
Conceived in the late 1990s, the initiative followed advances at Nobeyama Radio Observatory and lessons from projects like James Clerk Maxwell Telescope and Submillimeter Array. Funding and technical leadership involved the Ministry of Education, Culture, Sports, Science and Technology (Japan), university consortia including University of Tokyo and Nagoya University, and collaboration with Chilean authorities such as the Compañía de Teléfonos de Chile (infrastructure partners). The telescope was constructed on the Chajnantor Plateau with logistics influenced by precedents from ALMA site selection and operations. Commissioning overlapped with campaigns by Herschel Space Observatory and survey planning by Wide-field Infrared Survey Explorer teams.
The telescope employs a precision 10‑metre parabolic reflector designed for wavelengths near 350 GHz to 850 GHz, incorporating technologies developed at Nobeyama Radio Observatory, National Astronomical Observatory of Japan, University of Tokyo, and industry partners such as Mitsubishi Electric and NEC Corporation. Receivers include bolometer arrays and heterodyne mixers derived from developments at Max Planck Institute for Radio Astronomy, National Radio Astronomy Observatory, and CEA Saclay. Backends and spectrometers were influenced by designs used at IRAM 30m Telescope and APEX; cryogenic systems employ techniques from Institute of Space and Astronautical Science and Jet Propulsion Laboratory heritage. Control software integrates standards from Common Astronomy Software Applications and telemetry protocols comparable to ALMA.
The instrument targets continuum mapping and spectral-line surveys of molecular transitions such as CO, [CI], and HCN across Galactic and extragalactic sources. Science goals align with research programmes at Max Planck Institute for Astronomy, Harvard–Smithsonian Center for Astrophysics, Princeton University, University of Cambridge, and California Institute of Technology focusing on star formation, protostellar disks, and high‑redshift dusty starburst galaxies. The telescope complements work by Spitzer Space Telescope, Chandra X‑ray Observatory, Keck Observatory, and Very Large Telescope by providing submillimeter constraints on dust continuum, molecular gas mass, and kinematics. Surveys have been structured to support follow‑up with ALMA, James Webb Space Telescope, and ground observatories such as Subaru Telescope and Gemini Observatory.
Situated near the Chajnantor Plateau at about 4,800 metres elevation in the Antofagasta Region of Chile, the site shares the high‑altitude, low‑water‑vapour advantages identified for ALMA and APEX. Access and logistics are coordinated with regional infrastructure used by ALMA Project and supported by facilities at San Pedro de Atacama and the Chilean Air Force. Environmental and cultural considerations involved consultation with local authorities and stakeholders including Chilean Ministry of National Assets and regional municipalities. Site meteorology and atmospheric transmission studies referenced methodology from National Oceanic and Atmospheric Administration and instrument calibration approaches similar to those at IRAM.
Operational management is undertaken by teams from Nobeyama Radio Observatory and the National Astronomical Observatory of Japan with time allocation and observer support following procedures used at ALMA, IRAM, and James Clerk Maxwell Telescope. Collaborative projects have included researchers from University of Chile, University of Bonn, Observatoire de Paris, Max Planck Institute for Radio Astronomy, and North American institutions such as Harvard University and University of California, Berkeley. Data reduction and archiving use pipelines inspired by Common Astronomy Software Applications and archival practice like that at European Southern Observatory and NASA/IPAC.
The telescope contributed to high‑resolution continuum maps of nearby star‑forming regions, complementing studies from Herschel Space Observatory and enabling follow‑up spectroscopy with ALMA and Submillimeter Array. Results included surveys of molecular cloud structure that informed models at institutions such as Harvard–Smithsonian Center for Astrophysics and Max Planck Institute for Astronomy, and detections of dusty starburst galaxies at redshifts studied in parallel by Keck Observatory and Very Large Telescope teams. Findings have been cited alongside work from Planck (spacecraft), Spitzer Space Telescope, and James Webb Space Telescope planning documents for multiwavelength campaigns.
Category:Radio telescopes Category:Observatories in Chile Category:Submillimeter astronomy