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Recent detections of Lyman alpha (Ly$\alpha$) emission from $z>7.5$ galaxieswere somewhat unexpected given a dearth of previous non-detections in this erawhen the intergalactic medium (IGM) is still highly neutral. But thesedetections were from UV bright galaxies, which preferentially live inoverdensities which reionize early, and have significantly Doppler-shiftedLy$\alpha$ line profiles emerging from their interstellar media (ISM), makingthem less affected by the global IGM state. Using a combination of reionizationsimulations and empirical ISM models we show, as a result of these two effects,UV bright galaxies in overdensities have $>2\times$ higher transmission throughthe $z\sim7$ IGM than typical field galaxies, and this boosted transmission isenhanced as the neutral fraction increases. The boosted transmission is notsufficient to explain the observed high Ly$\alpha$ fraction of $M_\mathrm{UV}\lesssim -22$ galaxies (Stark et al. 2017), suggesting Ly$\alpha$ emitted bythese galaxies must be stronger than expected due to enhanced production and/orselection effects. Despite the bias of UV bright galaxies to reside inoverdensities we show Ly$\alpha$ observations of such galaxies can accuratelymeasure the global neutral hydrogen fraction, particularly when Ly$\alpha$ fromUV faint galaxies is extinguished, making them ideal candidates forspectroscopic follow-up into the cosmic Dark Ages.

Beacons into the Cosmic Dark Ages: Boosted transmission of Ly$\alpha$ from UV bright galaxies at $z \gtrsim 7$