Welcome to ALMA and the European ALMA Regional Centre!

ALMA (Atacama Large Millimeter/submillimeter Array) is the world's largest ground-based facility for observations in the millimeter/submillimeter regime located on the Chajnantor plateau, 5000 meters altitude in northern Chile. It enables transformational research into the physics of the cold Universe, probes the first stars and galaxies, and directly images the formation of planets. ALMA comprises a giant array of fifty 12-m antennas, which can be configured to achieve baselines up to 16 km. It is equipped with state-of-the-art receivers that cover all the atmospheric windows up to 1 THz. In addition, a compact array of 7-m and 12-m antennas greatly enhance ALMA's ability to image extended sources.

The European ALMA Regional Centre (ARC) provides the interface between the ALMA project and the European science community. It supports its users mainly in the areas of proposal preparation, observation preparation, data reduction, and data analysis.

Below you can read the latest Announcements from the European ARC Network.. More details and up-to-date information can be found in the News section and the ALMA Science Portal.

Morphological Image Similarity Search on the ALMA Science Archive

Published: 02 Dec 2025

The ALMA Science Archive (ASA) now allows you to visually search for images that are morphologically similar to a given ASA image (currently 259,126 continuum images and 196,322 peak-flux images of data-cubes) with the aim to help you find such images extremely rapidly within the vast ASA holdings. A description of the state-of-the-art deep learning method used to determine similar images - self-supervised contrastive affine-transformation-independent representation learning with a deep neural network - and the interface we have developed can be found in this ESO Messenger article.

assess_ms 3.0.1 released

Published: 28 Nov 2025

An updated version of the uv coverage assessment tool "assess_ms" is now available here. The software will now run with NumPy 2 under the recently released CASA 6.6.6, the official CASA version for ALMA Cycle 12. Additional information can also be found here.

Targets for Band 2 Science Verification announced

Published: 19 Nov 2025

New Science Verification targets that will demonstrate the Band 2 receivers are now listed on the Science Verification webpage. The possible targets are G31.41+0.31Arp 220SPT 0027-50 and HR 5907. The data are planned to be taken with about 25 antennas and will be released for public use; the release of any Science Verification data will also be preceded by a similar announcement. Please visit the above web page for more information.

Record number of observing hours in Cycle 11

Published: 29 Oct 2025

The ALMA Observatory is delighted to announce that Cycle 11 has set a new all-time record in the number of science-quality observing hours (QA0 PASS observations) delivered across all three arrays. During Cycle 11, ALMA successfully acquired a total of 4496 hours of science-quality data with the 12-m Array, surpassing for the first time the ambitious goal of 4300 hours offered. In addition, 4201 hours were delivered with the 7-m Array, and 3240 hours with the Total Power Array.

Unveiling ALMA Band 2 Workshop abstract submission deadline

Published: 28 Oct 2025

In anticipation of Band 2 being offered in the near future, this European ARC workshop brings together astronomers and ALMA/ARC staff to discuss the new potential for various scientific fields. We plan to have a dedicated session focused on looking at the Band 2 Science Verification data. The meeting is hosted by the Italian ALMA Regional Centre node. It will be held in person at the CNR Area in Bologna from Tuesday February 24 to Thursday February 26, 2026

The workshop will have a number of invited talks to provide information about the Band 2 receiver, and cover the main scientific areas for which Band 2 is expected to be important. In addition, there will be space for several contributed talks and posters. Participants that are interested in presenting their science and ideas, including synergies with other wavelength regimes, are encouraged to submit an abstract by October 31st.

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