The GLARE Survey – II. Faint z≈ 6 Lyα line emitters in the HUDF

Accepted. Received; in original form The galaxy population at z ≈ 6 has been the subject of intense study in recent years, culminating in the Hubble Ultra Deep Field (HUDF) – the deepest imaging survey yet. A large number of high redshift galaxy candidates have been identified within the HUDF, but until now analysis of their properties has been hampered by the difficulty of obtaining spectroscopic redshifts for these faint galaxies. Our “Gemini Lyman-Alpha at Reionisation Era ” (GLARE) project has been designed to undertake spectroscopic follow up of faint (z ′ < 28.5) i ′-drop galaxies at z ≈ 6 in the HUDF. In a previous paper we presented preliminary results from the first 7.5 hours of data from GLARE. In this paper we detail the complete survey. We have now obtained 36 hours of spectroscopy on a single GMOS slitmask from Gemini-South, with a spectral resolution of λ/∆λFWHM ≈ 1000. We identify five strong Lyman-α emitters at z> 5.5, and a further nine possible line emitters with detections at lower significance. We also place tight constraints on the equivalent width of Lyman-α emission for a further ten i ′-