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We discuss the properties of Lyman Break galaxies (LBGs) at z>5 as determinedfrom disparate fields covering approximately 500 sq. arcmin. While the broadcharacteristics of the LBG population has been discussed extensively in theliterature, such as luminosity functions and clustering amplitude, we focus onthe detailed physical properties of the sources in this large survey (>100 withspectroscopic redshifts). Specifically, we discuss ensemble mass estimates,stellar mass surface densities, core phase space densities, star-formationintensities, characteristics of their stellar populations, etc as obtained frommulti-wavelength data (rest-frame UV through optical) for a subsample of thesegalaxies. In particular, we focus on evidence that these galaxies drivevigorous outflows and speculate that this population may solve the so-called``pre-enrichment problem''. The general picture that emerges from these studiesis that these galaxies, observed about 1 Gyr after the Big Bang, haveproperties consistent with being the progenitors of the densest stellar systemsin the local Universe -- the centers of old bulges and early type galaxies.

The Physical Properties of LBGs at z>5: Outflows and the "pre-enrichment problem"