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We present an analysis of the far-infrared (FIR) spectral energydistributions (SEDs) of two massive K-selected galaxies at z = 2.122 and z =2.024 detected at 24um, 70um, 160um by Spitzer, 250um, 350um, 500um by BLAST,and 870um by APEX. The large wavelength range of these observations and theavailability of spectroscopic redshifts allow us to unambiguously identify thepeak of the redshifted thermal emission from dust at ~ 300um. The SEDs of bothgalaxies are reasonably well fit by synthetic templates of local galaxies withL_IR ~ 10^{11} L_{sun} -- 10^{12} L_{sun} yet both galaxies have L_{IR} ~10^{13} L_{sun}. This suggests that these galaxies are not high redshiftanalogues of the Hyper-LIRGs/ULIRGs used in local templates, but are instead"scaled up" versions of local ULIRGs/LIRGs. For both galaxies the starformation rate determined from the best-fit FIR SEDs (SFR(L_{IR})) agrees withthe SFR determined from the dust corrected H-alpha luminosity (SFR(H-alpha)) towithin a factor of ~ 2; however, when the SFR of these galaxies is estimatedusing only the observed 24um flux and the standard luminosity-dependenttemplate method (SFR(24um)), it systematically overestimates the SFR by as muchas a factor of 6. A larger sample of 24 K-selected galaxies at z ~ 2.3 drawnfrom the Kriek et al. (2008) GNIRS sample shows the same trend betweenSFR(24um) and SFR(H-alpha). Using that sample we show that SFR(24um) andSFR(H-alpha) are in better agreement when SFR(24um) is estimated using the logaverage of local templates rather than selecting a single luminosity-dependenttemplate, because this incorporates lower luminosity templates. The betteragreement between SFRs from lower luminosity templates suggests that the FIRSEDs of the BLAST-detected galaxies may be typical for massive galaxies at z ~2, and that the majority are scaled up versions of lower luminosity localgalaxies.

Well-Sampled Far-Infrared Spectral Energy Distributions of z ~ 2 Galaxies: Evidence for Scaled up Cool Galaxies