Spitzer Survey of Stellar Structure in Galaxies (S4G) Overview
S4G Overview S4G Primary Data Access S4G Catalogs


The Spitzer Survey of Stellar Structure in Galaxies (S4G) consists of a sample of 2,352 galaxies, which have been mapped with IRAC channels 1 and 2 (3.6 and 4.5 microns). A follow-up survey added 465 early-type galaxies, bringing the total to 2,817 galaxies. IRSA hosts the complete S4G project data set, including results from galaxy modeling using ellipse fitting and Galfit, as well as Independent Component Analysis to separate stellar and nonstellar emission. A catalog of photometry, model parameters, measurements from the literature, and a link to the S4G data for each galaxy is also available.

If you use S4G data, please cite the journal articles Sheth et al. (2010), Munoz-Mateos et al. (2013), Querejeta et al. (2015), and Watkins et al. (2022), as well as the dataset Digital Object Identifier (DOI): 10.26131/IRSA425.

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Data Set Characteristics

Data ProductDescriptionData Access
Images Spitzer/IRAC 3.6, 4.5
Models Ellipse fitting
Browseable Directories
Stellar Independent Component Analysis Stellar & nonstellar emission maps Browseable Directories
Catalog S4G Original and Early-Type Galaxy Catalogs

S4G Documentation

Pipeline Documentation
Galfit Model Documentation
Stellar ICA Documentation
Early-Type Galaxies Documentation
S4G Catalog Descriptions
S4G Early-Type Galaxies Catalog Descriptions
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