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We carry out a multi-wavelength study of individual galaxies detected by theBalloon-borne Large Aperture Submillimeter Telescope (BLAST) and identified atother wavelengths, using data spanning the radio to the ultraviolet (UV). Wedevelop a Monte Carlo method to account for flux boosting, source blending, andcorrelations among bands, which we use to derive deboosted far-infrared (FIR)luminosities for our sample. We estimate total star-formation rates for BLASTcounterparts with z < 0.9 by combining their FIR and UV luminosities. Starformation is heavily obscured at L_FIR > 10^11 L_sun, z > 0.5, but thecontribution from unobscured starlight cannot be neglected at L_FIR < 10^11L_sun, z < 0.25. We assess that about 20% of the galaxies in our sample showindication of a type-1 active galactic nucleus (AGN), but their submillimeteremission is mainly due to star formation in the host galaxy. We compute stellarmasses for a subset of 92 BLAST counterparts; these are relatively massiveobjects, with a median mass of ~10^11 M_sun, which seem to link the 24um andSCUBA populations, in terms of both stellar mass and star-formation activity.The bulk of the BLAST counterparts at z<1 appear to be run-of-the-millstar-forming galaxies, typically spiral in shape, with intermediate stellarmasses and practically constant specific star-formation rates. On the otherhand, the high-z tail of the BLAST counterparts significantly overlaps with theSCUBA population, in terms of both star-formation rates and stellar masses,with observed trends of specific star-formation rate that support strongevolution and downsizing.

A panchromatic study of BLAST counterparts: total star-formation rate, morphology, AGN fraction and stellar mass