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We present an atlas of 88 z~5.7 and 30 z~6.5 Ly alpha emitters obtained froma wide-field narrowband survey. We combined deep narrowband imaging in 120Abandpass filters centered at 8150A and 9140A with deep BVRIz broadband imagingto select high-redshift galaxy candidates over an area of 4180 square arcmin.The goal was to obtain a uniform selection of comparable depth over the 7targeted fields in the two filters. For the GOODS-N region of the HDF-N field,we also selected candidates using a 120A filter centered at 9210A. We madespectroscopic observations with Keck DEIMOS of nearly all the candidates toobtain the final sample of Ly alpha emitters. At the 3.3A resolution of theDEIMOS observations the asymmetric profile for Ly alpha emission with its steepblue fall-off can be clearly seen in the spectra of nearly all the galaxies. Weshow that the spectral profiles are surprisingly similar for many of thegalaxies and that the composite spectral profiles are nearly identical at z=5.7and z=6.5. We analyze the distributions of line widths and Ly alpha equivalentwidths and find that the lines are marginally narrower at the higher redshift,with median values of 0.77A at z=6.5 and 0.92A at z=5.7. The line widths have adependence on the Ly alpha luminosity of the form L(L alpha)^(0.3). We comparethe surface densities and the luminosity functions at the two redshifts andfind that there is a multiplicative factor of 2 decrease in the number densityof bright Ly alpha emitters from z=5.7 to z=6.5, while the characteristicluminosity is unchanged.

An Atlas of z=5.7 and z=6.5 Ly alpha Emitters