Computer Science
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop60094v&link_type=abstract
Spitzer Proposal ID #60094
Computer Science
Scientific paper
In Lambda-CDM models, galactic disks are built through the accretion of small satellites and through in situ star formation activity. We propose to obtain deep observations with IRAC bands 1 and 2 to trace the faint extended stellar component of nearby gas-rich galaxies in order to investigate models of galactic disk formation and growth. While little is currently known about the full spatial extent of the stellar component within a dark matter halo, we have identified a sample of 5 gas-rich galaxies with extremely large HI disks (D_HI/D_opt > 5) as being the most likely candidates to harbor extended faint stellar populations. The proposed deep IR observations will allow us to trace their stellar distributions to unprecedented levels at wavelengths that are insensitive to both dust extinction and the galaxy's star formation history. Because our observations are exploratory in nature, we also propose observations of a control sample of 4 gas-rich galaxies with normal HI distributions (D_HI/D_opt ~ 2) in order to investigate the extent and nature of faint stellar populations in the outer disks of galaxies. Comparison of the observed IR surface brightness profiles with multiwavelength data (from UV to radio) will reveal the characteristics of the extended disk and provide insight into disk growth and evolution of gas-rich galaxies.
Barnes Kate L.
Bullock James S.
Calzetti Daniela
Chandar Rupali
Dalcanton Julianne J.
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