SAGE IRAC Offset Position Archive

The Spitzer Space Telescope Survey of the Large Magellanic Cloud Legacy Project Surveying the Agents of a Galaxy's Evolution (SAGE) traces the life cycle of observable matter that drives the evolution of a galaxy's appearance. SAGE has revealed over 6 million sources including ~150,000 evolved stars, ~50,000 young stellar objects and the diffuse interstellar medium with column densities > 1.2×1021 cm -2. The data will provide fundamental insights into the physical processes of the interstellar medium, the formation of new stars and the injection of mass by evolved stars and their relationships on the galaxy-wide scale of the Large Magellanic Cloud.\n\nIn comparison to the catalog, the archive has more source fluxes (fewer nulled wavelengths) and some more sources but these additions have more uncertainty associated with them. For the catalog, the S/N must be greater than [6, 6, 6, 10] for IRAC bands [3.6um], [4.5um], [5.8um] and [8.0um] for the flux to appear in the corresponding wavelength column. Whereas for the archive, the S/N must be greater than [5, 5, 5, 5] for IRAC bands [3.6um], [4.5um], [5.8um] and [8.0um]. For the catalog, sources with neighbors within a 2" radius are excluded (culled). For the archive, sources within a 0.5" radius are excluded. The difference in criteria for the catalog and archive creation is more complex and described in Section 5.2 of the SAGE Data Delivery Document.\n\nThe offset position is a calibration field at RA=82.25d Dec=-45.95d.

Data and Resources

Additional Info

Field Value
Maintainer IRSA Support
Last Updated September 7, 2026, 22:49 (UTC)
Created April 1, 2025, 12:57 (UTC)
accessLevel public
bureauCode {026:00}
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
harvest_object_id 250a8043-d7bc-4006-81d9-a9ac8a2bd63d
harvest_source_id b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title Science Discovery Engine
identifier ivo://irsa.ipac/spitzer/catalog/sage/sagei-offar
landingPage ivo://irsa.ipac/spitzer/catalog/sage/sagei-offar
license https://www.usa.gov/government-works
modified 2026-08-31T22:15:59Z
programCode {026:000}
publisher NASA/IPAC Infrared Science Archive
resource-type Dataset
source_datajson_identifier true
source_hash cfa4311a0c360f76db16f6d5822ad34f27b3b756e5ba2d382240822073687123
source_schema_version 1.1
theme {Astrophysics}