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We discovered a sample of 250 Ly-Alpha emitting (LAE) galaxies at z=2.1 in anultra-deep 3727 A narrow-band MUSYC image of the Extended Chandra DeepField-South. LAEs were selected to have rest-frame equivalent widths (EW) > 20A and emission line fluxes > 2.0 x 10^(-17)erg /cm^2/s, after carefullysubtracting the continuum contributions from narrow band photometry. The medianflux of our sample is 4.2 x 10^(-17)erg/cm^2/s, corresponding to a median Lyaluminosity = 1.3 x 10^(42) erg/s at z=2.1. At this flux our sample is > 90%complete. Approximately 4% of the original NB-selected candidates were detectedin X-rays by Chandra, and 7% were detected in the rest-frame far-UV by GALEX.At luminosity>1.3 x 10^42 erg/s, the equivalent width distribution is unbiasedand is represented by an exponential with scale-length of 83+/-10 A. Above thissame luminosity threshold, we find a number density of 1.5+/-0.5 x 10^-3Mpc^-3. Neither the number density of LAEs nor the scale-length of their EWdistribution show significant evolution from z=3 to z=2. We used the rest frameUV luminosity to estimate a median star formation rate of 4 M_(sun) /yr. Themedian rest frame UV slope, parametrized by B-R, is that typical of dust-free,0.5-1 Gyr old or moderately dusty, 300-500 Myr old populations. Approximately40% of the sample occupies the z~2 star-forming galaxy locus in the UVR twocolor diagram. Clustering analysis reveals that LAEs at z=2.1 haver_0=4.8+/-0.9 Mpc and a bias factor b=1.8+/-0.3. This implies that z=2.1 LAEsreside in dark matter halos with median massesLog(M/M_(sun))=11.5^(+0.4)_(-0.5), which are among of the lowest-mass halos yetprobed at this redshift. We used the Sheth-Tormen conditional mass function tostudy the descendants of these LAEs and found that their typical present-daydescendants are local galaxies with L* properties, like the Milky Way.

Lyman-Alpha-Emitting Galaxies at z = 2.1 in ECDF-S: Building Blocks of Typical Present-day Galaxies?