Over the last decade, observations of the Lyman-α (Lyα) line in galaxies at z>6.5 have provided important insight into the nature and onset of reionization. However, our understanding remains limited by the modest success of follow-up campaigns aimed at measuring systemic redshifts, as well as the reliance on slit spectroscopy. Here, we propose to use the VPH900 Grism on the Subaru/FOCAS IFU to map the distribution and kinematics of Lyα in two bright z=7 galaxies. Both targets were first detected in [CII] 158 µm and dust continuum emission using ALMA, and were subsequently identified as the brightest Lyα emitters among a sample of z>6.5 galaxies observed with MMT/Binospec. With the requested observations, we will (1) directly compare the spatial and velocity structure of the Lyα emission to the kinematic and/or spatial distributions from [CII] and dust; (2) map the Lyα escape fraction as a function of position within the galaxy and; (3) assess the incidence and structure of Lyα halos in the epoch of reionization.
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