Spitzer Deep Wide-Field Survey 4.5 micron Epoch 1 Catalog

The Spitzer Deep, Wide-Field Survey (SDWFS) is a four-epoch infrared survey of 10 square degrees in the Boötes field of the NOAO Deep Wide-Field Survey using the IRAC instrument on the Spitzer Space Telescope. SDWFS, a Spitzer Cycle 4 Legacy project, occupies a unique position in the area-depth survey space defined by other Spitzer surveys. The four epochs that make up SDWFS permit - for the first time - the selection of infrared-variable and high proper motion objects over a wide field on timescales of years. Because of its large survey volume, SDWFS is sensitive to galaxies out to z ~ 3 with relatively little impact from cosmic variance for all but the richest systems. The SDWFS data sets will thus be especially useful for characterizing galaxy evolution beyond z ~ 1.5.\n\nThe delivery consists of four band-matched catalogs for each of the four epochs and for the total SDWFS coadd data, a total of 20 catalogs. Vega magnitudes are reported for each IRAC band: 3.6, 4.5, 5.8, and 8 microns. Each source was measured three ways: 4 arcsec diameter aperture, 6 arcsec diameter aperture, and Kron radius aperture (MAG_AUTO in SExtractor). Source coordinates correspond to 2MASS catalog positions to within 0.2 arcsec. The tabulated uncertainties are twice the SExtractor (statistical only) uncertainties as an attempt to account for systematic uncertainties.

Data and Resources

Additional Info

Field Value
Maintainer Tess Jaffe
Last Updated March 16, 2026, 16:41 (UTC)
Created April 1, 2025, 13:32 (UTC)
accessLevel public
bureauCode {026:00}
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
harvest_object_id 6961276e-42d7-4130-b060-4c29d4560c31
harvest_source_id b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title Science Discovery Engine
identifier ivo://irsa.ipac/spitzer/catalog/sdwfs/sdwfsi2ep1
landingPage ivo://irsa.ipac/spitzer/catalog/sdwfs/sdwfsi2ep1
license https://www.usa.gov/government-works
modified 2026-03-09T22:15:59Z
programCode {026:000}
publisher NASA/IPAC Infrared Science Archive
resource-type Dataset
source_datajson_identifier true
source_hash 48b3436ee66f3b3b143c6d71f0f81b30c9bac3a23f5b9ece84f352de0b437ed9
source_schema_version 1.1
theme {Astrophysics}