Science Highlight





The Additional Representative Images for Legacy (ARI-L) in the ALMA Science Archive (ASA) is an Development project for ALMA upgrade approved by the ALMA Director in December 2018. It is based on the results of a feasibility study approved by ESO, as reported in Massardi et al. (2019). The project aims to increase the legacy value of the ALMA Science Archive by bringing the reduction level of ALMA data from Cycles 2-4 close to that of what is processed with the ALMA Imaging Pipeline in more recent Cycles.

The complete set of ARI-L imaging products will be very relevant for all science fields and enhance the possibilities of exploitation of archival data. Indeed, making these images available for all the datasets will:

  • facilitate archive access and data usage for science purposes, also to non-expert data miners,
  • provide a homogeneous view of all data, in order to compare datasets and enable a more conscious download selection,
  • permit to more profitably link the archive to several visualisation and analysis tools (e.g. VO, CARTA, ADMIT, KAFE, ...),
  • allow users to generate previews similar to those planned for future cycles.

The project plans to produce and ingest into the ASA a uniform set of full data cubes and continuum images covering at least 70% of the data from Cycles 2-4. These cubes will complement the more limited QA2-generated image products which cover only a small fraction (< 10%) of the observed data for those cycles.

With the computing facilities already available at the Italian node of the European ALMA Regional Centre (ARC) and the collaboration of staff from other European ARC nodes, the ARI-L products will be generated, certified for quality and ingested into the archive as additional products. 

The whole project began in June 2019 and is expected to be completed within three years. A complete set of ARI-L imaging products will be highly relevant for all science cases and enhance the possibilities of exploitation of archival data.


Examples of the ARI-L products are here


For more information:


Publication Acknowledgement

The use of the data must be acknowledged using the standard ALMA Publication Acknowledgement statement.

For more information see Massardi et al. in preparation for a detailed description of ARI-L.