An Alma Survey of Sub-Millimeter Galaxies in the Extendedchandradeep Field South: Physical Properties Derived From Ultraviolet-to-Radio Modeling

The ALESS survey has followed up on a sample of 122 sub-millimeter sources in the Extended Chandra Deep Field South at 870 m with the Atacama Large Millimeter Array (ALMA), allowing us to pinpoint the positions of submillimeter galaxies (SMGs) to 0.3 arcsec and to find their precise counterparts at different wavelengths. This enabled the first compilation of the multi-wavelength spectral energy distributions (SEDs) of a statistically reliable survey of SMGs. In this paper, we present a new calibration of the MAGPHYS SED modeling code that is optimized to fit these ultraviolet-to-radio SEDs of > z 1 star-forming galaxies using an energy balance technique to connect the emission from stellar populations, dust attenuation, and dust emission in a physically consistent way. We derive statistically and physically robust estimates of the photometric redshifts and physical parameters (such as stellar masses, dust attenuation, star formation rates (SFRs), and dust masses) for the ALESS SMGs. We find that the ALESS SMGs have median stellar mass = M M * 8.9 0.1 10 10