Spitzer Survey of Stellar Structure in Galaxies (S4G)
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).
IRSA hosts the complete S4G project data set, including results from galaxy modeling using ellipse fitting and Galfit, and 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.
You can get a close-up map of a region by clicking on any of the red overlays on the above image, or by typing a coordinate below.
The 2,352 S4G galaxies are represented as overlays in red on the all-sky ISSA image above. Use the form below to enter a coordinate or object name to search for data, or click on any red region to get a close-up of the area.
The canonical papers for S4G are Sheth et al. (2010), Regan et al. (in prep), Munoz-Mateos et al. (2013), and Querejeta et al. (2014).
Access all the Spitzer Legacy datasets at IRSA.
Click here for more information and instructions on using Atlas Instructions
Also available is a Program Interface to Atlas.
Target Selection Single Object
(Name or Coords)
Table Upload
(Multi Object) Instructions
Size (deg):
[maximum 12.5]
Images must cover coordinate
Coordinate Examples:
  • 36.905968 -1.155945 eq
  • 131.69273685 38.07919587 ga
  • NGC4050
Default: Equatorial J2000