The Spitzer Survey of Stellar Structure in Galaxies (S4G)
is a Spitzer Space
Telescope Warm Mission project that was approved in Spring 2009. The
project is led by Dr. Kartik Sheth, formerly of the Spitzer
Science Center. I am a member of the science team. The project involves
obtaining near-infrared images of 2,331 galaxies within a distance
of 40 Megaparsecs as a means of studying the stellar structure in
galaxies to the lowest surface brightnesses possible. (For a comparison
between a typical ground-based near-IR image and a typical Spitzer image,
click here). The images are being obtained in 3.6 and 4.5 micron
filters that sample mainly the stellar mass components of disk-shaped
galaxies. The images are mostly transparent to interstellar dust, but are
sensitive to the warm dust associated with star-forming regions (see
images below).
At right is the link to the main S4G project homepage,
as well as links to the first published S4G
papers and a large mid-IR galaxy atlas based on this paper.
The Spitzer Space Telescope
Comparison between S4G images and groundbased
blue light (B-band) images of four galaxies. Top to
bottom: NGC 584, NGC 1097, NGC 628, and NGC 428.
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S4G Homepage
The Spitzer Survey of Stellar Structure in Galaxies (S4G) (Sheth et
al. 2010)
Mid-IR galaxy morphology paper (Buta et al. 2010)
Mid-IR Galaxy Morphology Atlas
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