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Recent evidence suggests that high-redshift Ly-alpha emitting galaxies (LAEs)with logL(Ly-alpha) > 43.5 erg/s, referred to as ultraluminous LAEs (ULLAEs),may show less evolution than lower-luminosity LAEs in the redshift rangez=5.7-6.6. Here we explore the redshift evolution of the velocity widths of theLy-alpha emission lines in LAEs over this redshift interval. We use newwide-field, narrowband observations from Subaru/Hyper Suprime-Cam to provide asample of 24 z=6.6 and 12 z=5.7 LAEs with log L(Ly-alpha) > 43 erg/s, all ofwhich have follow-up spectroscopy from Keck/DEIMOS. Combining with archivallower-luminosity data, we find a significant narrowing of the Ly-alpha lines inLAEs at logL(Ly-alpha) < 43.25 erg/s -- somewhat lower than the usual ULLAEdefinition -- at z = 6.6 relative to those at z = 5.7, but we do not see thisin higher-luminosity LAEs. As we move to higher redshifts, the increasingneutrality of the intergalactic medium should increase the scattering of theLy-alpha lines, making them narrower. The absence of this effect in thehigher-luminosity LAEs suggests they may lie in more highly ionized regions,self-shielding from the scattering effects of the intergalactic medium.

The Evolution of Lyman Alpha Emitter Line Widths from z=5.7 to z=6.6