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We present DEIMOS spectroscopic observations of the most UV-luminousstar-forming galaxies at 3.2<z<4.6. Our sample contains galaxies withluminosities of L*<L<7L* and is one of the largest samples to date of the mostUV-luminous galaxies at these redshifts. Our data confirm 41 star-forminggalaxies at 3.2<z<4.6 and validate the clean selection of the photometriccandidates. We find that the fraction of Lya emitting galaxies increases withdecreasing UV luminosity. We find strong evidence of large-scale outflows,transporting the neutral/ionized gas in the interstellar medium away from thegalaxy. Galaxies exhibiting both interstellar absorption and Lya emission linesshow a significant velocity offset between the two features (200-1140 km/s). Wefind tentative evidence that this measure of the outflow velocity increaseswith UV luminosity and/or stellar mass. The luminosity- and mass-dependentoutflow strengths suggest that the efficiency of feedback and enrichment of thesurrounding medium depend on these parameters. We present composite spectra ofthe absorption-line-only and Lya-emitting subsets of the UV luminous galaxiesat z~3.7. The composite spectra are similar to those of lower-z andlower-luminosity LBGs samples, but with some subtle differences. Analyses ofthe composite spectra suggest that the UV luminous LBGs at z~3.7 may have ahigher covering fraction of absorbing gas, and may be older than their lower-zand lower-luminosity counterparts. In addition, we have discovered 5 galaxiesthat belong to a massive overdensity at z=3.78. Finally, two galaxies each showtwo distinct sets of interstellar absorption features. The latter may be a signof a final stage of major merger, or clumpy disk formation. Their presenceimplies that frequency of such sources among our luminous z~3.7 LBGs may be anorder of magnitude higher than in lower redshift and lower luminosity samples.

Probing High-Redshift Galaxy Formation at the Highest Luminosities: New Insights from DEIMOS Spectroscopy