The Spitzer Survey of Stellar Structure in Galaxies (S4G)

Details The Spitzer Survey of Stellar Structure in Galaxies (S4G) The Spitzer Survey of Stellar Structure in Galaxies (S4G)

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop60007s&link_type=abstract

Spitzer Proposal ID #60007

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We propose the ultimate survey of the distribution of stellar structure in the nearby universe using IRAC's 3.6 and 4.5 micron channels. Deep observations of the stellar mass distribution, down to 0.1 Msun per sq. pc for a sample of ~2,300 nearby (d<40Mpc) galaxies, will provide an unprecedented dataset for studies of structure formation during galaxy evolution. Such observations will provide answers to some of the most fundamental questions of our field: how are outer disks and halos formed? how do galaxy interactions affect the formation and evolution of galactic structures? which structural parameters govern internal galaxy evolution? Our large unbiased sample of all Hubble types ranging from dwarfs to spirals to e llipticals will allow for such structural studies, not only as a function of stellar mass, but also as a function of environment, and the output of such an immense survey will serve as a vital testbed for cosmological simulations predicting the mass properties of present-day galaxies.

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