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We study the physical properties of 216 z ~ 2.1 LAEs discovered in anultra-deep narrow-band MUSYC image of the ECDF-S. We fit their stacked SpectralEnergy Distribution (SED) using Charlot & Bruzual templates. We consider starformation histories parametrized by the e-folding time parameter tau, allowingfor exponentially decreasing (tau>0), exponentially increasing (tau<0), andconstant star formation rates. These LAEs are characterized by best fitparameters and 68% confidence intervals of log(M_*/M_sun)=8.6[8.4-9.1],E(B-V)=0.22[0.00-0.31], tau=-0.02[(-4)-18] Gyr, and age_ SF=0.018[0.009-3] Gyr.Thus, we obtain robust measurements of low stellar mass and dust content, butwe cannot place meaningful constraints on the age or star formation history ofthe LAEs. We also calculate the instantaneous SFR to be 35[0.003-170] M_sun/yr,with its average over the last 100 Myr before observation giving<SFR>_100=4[2-30] M_sun/yr. When we compare the results for the same starformation history, LAEs at z~2.1 are dustier and show higher instantaneous SFRsthan z~3.1 LAEs, while the observed stellar masses of the two samples seemconsistent. LAEs appear to occupy the low-mass end of the distribution of starforming galaxies at z~2. We perform SED fitting on several sub-samples selectedbased on photometric properties and find that LAE sub-samples at z~2.1 exhibitheterogeneous properties. The IRAC-bright, UV-bright and red LAEs have thelargest stellar mass and dust reddening. The UV-faint, IRAC-faint, and highequivalent width LAE sub-samples appear less massive (<10^9 M_sun) and lessdusty, with E(B-V) consistent with zero.

Ly-alpha Emitting Galaxies at z = 2.1: Stellar Masses, Dust and Star Formation Histories from Spectral Energy Distribution Fitting