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We present deep narrow-band (lambda = 5390 Angstroms, delta lambda = 77Angstroms) and multi-color observations of the Hubble Deep Field and the HawaiiDeep Field SSA22 obtained with the LRIS instrument at the Keck II 10-mtelescope. It is shown that there is a substantial population of galaxies atz~3.4 which can be selected by Ly alpha emission. Comparison withcolor-selected samples shows that the samples selected with these differentcriteria have substantial, but not complete overlap, and that there is acomparable surface density in the two selected populations. The emission-lineselected samples include objects with strong Ly alpha, and which aresignificant contributers to the integrated star formation at these epochs. Fora Salpeter IMF we estimate a minimum star formation rate of 0.01 solar massesper cubic Mpc per yr at z=3.4 for H_0 = 65 km/s/Mpc and q_0 = 0.5 in the Lyalpha-selected objects, though the value could be substantially higher if thereis significant extinction.

the astronomical journal

High-[CLC][ITAL]z[/ITAL][/CLC] L[CLC]y[/CLC]α Emitters. I. A Blank-Field Search for Objects near Redshift [CLC][ITAL]z[/ITAL][/CLC] = 3.4 in and around the Hubble Deep Field and the Hawaii Deep Field SSA 22