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Ultraluminous Lyman alpha (Lya) emitting galaxies (ULLAEs) with log L(Lya)>43.5 erg/s near the epoch of reionization (z>5) make up the bright end ofthe LAE luminosity function (LF) and may provide insight into the process ofreionization, including the formation of ionized bubbles around these extremesystems. We present a spectroscopic LF for ULLAEs at z=5.7. We used data fromthe HEROES ~45 sq. deg Subaru Hyper Suprime-Cam survey, which is centered onthe North Ecliptic Pole and has both broadband (grizY) and narrowband (NB816and NB921) imaging, to select candidate ULLAEs based on a NB816 excess and astrong broadband Lyman break. We spectroscopically observed 17 ULLAE candidateswith DEIMOS on Keck II. We confirmed 12 as LAEs at z=5.7, 9 of which areULLAEs. The remaining sources are an AGN at z=5.7, an [OIII]5007 emitter atz=0.63, a red star, and two spectroscopic non-detections. Using the 9 confirmedULLAEs, we construct a ULLAE LF at z=5.7. After applying a comprehensiveincompleteness correction, we compare our new z=5.7 LF with our recent z=6.6 LFand with other LFs from the literature to look for evolution at theultraluminous end. We find the overall ratio of the z=5.7 to z=6.6 ULLAEcomoving number densities to be 1.92 (+1.12, -0.71), which corresponds to a LFoffset of 0.28 (+0.20, -0.20) dex.

The Evolution of the Ultraluminous Ly-alpha Luminosity Function over z=5.7-6.6