Cake Talk by Zuyi Chen
With the growing database of NIRSpec observations at z>7, we are beginning to investigate not only how reionization happened in time, but also how it progressed spatially in the early universe. Using a large sample of galaxies with publicly available NIRSpec observations, we investigate the redshift evolution of Ly-alpha visibility. We assess the impact of the environment on Ly-alpha visibility at z>7, finding evidence for enhanced Ly-alpha transmission in galaxy overdensities. We discuss the extreme case of the EGS field, highlighting the abundant z>7 Ly-alpha detections and new evidence for extended overdense structures. These results suggest that the formation of large ionized bubbles is already underway at these redshifts, with EGS likely to be one of the most ionized sightlines.