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Context: Ly-alpha-emitters have proven to be excellent probes of faint,star-forming galaxies in the high redshift universe. However, although thesample of known emitters is increasingly growing, their nature (e.g. stellarmasses, ages, metallicities, star-formation rates) is still poorly constrained.  Aims: We aim to study the nature of Ly-alpha-emitters, to find the propertiesof a typical Ly-alpha-emitting galaxy and to compare these properties with theproperties of other galaxies at similar redshift, in particular Lyman-breakgalaxies.  Methods: We have performed narrow-band imaging at the VLT, focused onLy-alpha at redshift z ~ 3.15, in the GOODS-S field. We have identified asample of Ly-alpha-emitting candidates, and we have studied their SpectralEnergy Distributions (SEDs).  Results: We find that the emitters are best fit by an SED with lowmetallicity (Z/Z_sun = 0.005), low dust extinction (A_V ~ 0.32) and mediumstellar masses of approximately 10^9 M_sun. The age is not very wellconstrained. One object out of 24 appears to be a high redshiftLy-alpha-emitting dusty starburst galaxy. We find filamentary structure astraced by the Ly-alpha-emitters at the 4 sigma level. The rest-frame UV SED ofthese galaxies is very similar to that of Lyman Break Galaxies (LBGs) andcomply with the selection criteria for U-band drop-outs, except they areintrinsically fainter than the current limit for LBGs.  Conclusion: Ly-alpha-emitters are excellent probes of galaxies in the distantuniverse, and represent a class of star-forming, dust and AGN free, medium massobjects.

A multi-wavelength study of z = 3.15 Lyman-alpha emitters in the GOODS South Field