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New deep optical and near-infrared imaging is combined with archivalultraviolet and infrared data for fifteen nearby galaxies mapped in the SpitzerExtended Disk Galaxy Exploration Science survey. These images are particularlydeep and thus excellent for studying the low surface brightness outskirts ofthese disk-dominated galaxies with stellar masses ranging between 10^8 and10^11 Msun. The spectral energy distributions derived from this dataset aremodeled to investigate the radial variations in the galaxy colors and starformation histories. Taken as a whole, the sample shows bluer and younger starsfor larger radii until reversing near the optical radius, whereafter the trendis for redder and older stars for larger galacto-centric distances. Theseresults are consistent with an inside-out disk formation scenario coupled withan old stellar outer disk population formed through radial migration and/or thecumulative history of minor mergers and accretions of satellite dwarf galaxies.However, these trends are quite modest and the variation from galaxy to galaxyis substantial. Additional data for a larger sample of galaxies are needed toconfirm or dismiss these modest sample-wide trends.

Radial Star Formation Histories in Fifteen Nearby Galaxies