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We present the faintest spectroscopically confirmed sample of redshift fourand five Lyman break galaxies to date. The sample is based on slitless grismspectra of the Hubble Ultra Deep Field region from the GRAPES (Grism ACSProgram for Extragalactic Science) and PEARS (Probing Evolution andReionization Spectroscopically) projects, using the G800L grism on the HSTAdvanced Camera for Surveys. We report here confirmations of 39 galaxies,pre-selected as candidate Lyman break galaxies using photometric selectioncriteria. We compare a "traditional" V-dropout selection to a more liberal one(with V-i > 0.9), and find that the traditional criteria are about 64% completeand 81% reliable. We also study the Lyman alpha emission properties of oursample. We find that Lyman alpha emission is detected in about 1/4 of thesample, and that our broad-band color selected sample includes 55% ofpreviously published line-selected Lyman alpha sources. Finally, we examine ourstacked 2D spectra. We demonstrate that strong, spatially extended (arcsecondscale) Lyman alpha emission is not a generic property of these Lyman breakgalaxies, but that a modest extension of the Lyman alpha photosphere (comparedto the starlight) may be present in those galaxies with prominent Lyman alphaemission.

Spectroscopic Confirmation of Faint Lyman Break Galaxies at Redshifts Four and Five in the Hubble Ultra Deep Field