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The epoch of reionization (6 < z < 10) marks the period in our universe whenthe first large galaxies grew to fruition, and began to affect the universearound them. Massive stars, and potentially accreting supermassive black holes,filled the universe with ionizing radiation, burning off the haze of neutralgas that had filled the intergalactic medium (IGM) since recombination(z~1000). The evolution of this process constrains key properties of theseearliest luminous sources, thus observationally constraining reionization is akey science goal for the next decade. The measurement of Lyman-alpha emissionfrom photometrically-identified galaxies is a highly constraining probe ofreionization, as a neutral IGM will resonantly scatter these photons, reducingdetectability. While significant work has been done with 8-10m telescopes,these observations require extremely large telescopes (ELTs); the flux limitsavailable from today's 10m class telescopes are sufficient for only thebrightest known galaxies (m < 26). Ultra-deep surveys with the Giant MagellanTelescope (GMT) and Thirty Meter Telescope (TMT) will be capable of detectingLyman-alpha emission from galaxies 2-3 magnitudes fainter than today's deepestsurveys. Wide-field fiber spectroscopy on the GMT combined with narrow-fieldAO-assisted slit spectroscopy on the TMT will be able to probe the expectedsize of ionized bubbles throughout the epoch of reionization, following updegree scale deep imaging surveys with the Wide Field Infrared Space Telescope.These data will provide the first resolved Lyman-alpha-based maps of theionized intergalactic medium throughout the epoch of reionization, constrainingmodels of both the temporal and spatial evolution of this phase change.

Unveiling the Phase Transition of the Universe During the Reionization Epoch with Lyman-alpha