S22B0112
S22B0112
Over the last decade, observations of the Lyα line in galaxies at z>6.5 have provided important insight into the nature and onset of reionization. However, the crucial mechanism behind reionization, namely the escape of Lyα photons, remains poorly understood. Here, we propose to directly investigate this long-standing problem using 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] 158µm 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 slit spectroscopy. The sources show Lyα profiles characterized by multiple peaks, a broad line profile, and large offsets from the systematic redshift. In turn, these luminous galaxies hold crucial insight into the physics governing reionization and are potentially responsible for carving out large ionized bubbles at z≈7. With the requested observations, we will (1) directly compare the spatial and velocity structure of the Lyα line to the kinematic and 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 at z≈7.
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