ALMA Observatory
Atacama
The ALMA Observatory, situated on the 5,000-meter-high Chajnantor plateau in Chile’s Atacama Desert, is a revolutionary astronomical interferometer consisting of 66 radio telescopes. It operates at millimeter and submillimeter wavelengths, providing unprecedented sensitivity and resolution for observing star birth and planet formation. ALMA's antennas can be repositioned across distances up to 16 kilometers, allowing variable zoom and detailed imaging capabilities. This international collaboration involves partners from Europe, North America, East Asia, and Chile, making it the most expensive ground-based telescope in operation. Since beginning scientific observations in 2011 and becoming fully operational in 2013, ALMA has transformed our understanding of the early universe and local stellar phenomena. Its unique high-altitude, dry location minimizes atmospheric interference, enabling clearer signals than previous submillimeter telescopes. The array includes a main set of 50 twelve-meter antennas and a compact array of smaller antennas that enhance wide-field imaging. ALMA continues to push the boundaries of astronomy, offering insights into the universe’s formative years and the complex chemistry of interstellar objects.
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Astuce: Visitors should plan their visit during the dry season for better accessibility and clearer skies. While ALMA is primarily a scientific facility, public tours and visitor center experiences are available by appointment and often require advance booking. Check the official website for announcements and special events. Discounts or special access may be offered for educational groups or during astronomy outreach events. Note that the high altitude requires visitors to acclimate and take precautions against altitude sickness.
Faits intéressants
- •ALMA is the most expensive ground-based telescope ever constructed, costing about $1.4 billion USD.
- •The observatory operates at an elevation of 5,000 meters (16,000 feet), one of the highest astronomical sites worldwide.
- •Its 66 antennas can be moved across distances from 150 meters to 16 kilometers to adjust the array's resolution.
- •ALMA’s name means 'soul' in Spanish and 'learned' or 'knowledgeable' in Arabic.
- •ALMA has produced the largest-ever image of the Milky Way’s core, revealing hidden chemistry.
Histoire
ALMA evolved from the merger of three major projects: the US Millimeter Array, the European Large Southern Array, and the Japanese Large Millimeter Array.
The collaboration began in 1997 between the NRAO and ESO, with Canada and Spain joining later.
The ALMA name was chosen in 1999, and the formal agreement was signed in 2003.
Japan joined in 2004, contributing the Atacama Compact Array and additional receiver bands, enhancing ALMA’s capabilities.
Construction began with a groundbreaking ceremony in 2003, and the array became fully operational in 2013, marking a milestone in international astronomical collaboration.
Guide du lieu
Main Array Antennas2011-2013
Comprising fifty 12-meter diameter antennas, the main array forms the core of ALMA's observational power, enabling high-resolution imaging of astronomical objects at millimeter wavelengths.
Atacama Compact Array (ACA)2004-2013
A set of sixteen antennas (four 12-meter and twelve 7-meter dishes) contributed by East Asian partners, designed to image larger fields of view and enhance the main array's wide-field imaging capability.
Chajnantor Plateau Site
Located at 5,000 meters elevation in the Atacama Desert, this site provides exceptional atmospheric conditions with low humidity and minimal radio interference, crucial for millimeter and submillimeter astronomy.