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Abstract Recent observations of GN-z11 with JWST have revealed a Ly α emission line with an equivalent width (EW) of 18 ± 2 Å. At z = 10.6, this galaxy is expected to lie in the heart of reionization. We use a series of inhomogeneous reionization simulations to derive the distribution of the Ly α EW after traveling through the neutral intergalactic medium with varying average neutral gas fraction, x H I . We use these distributions to place an upper limit of x H I 8. We find that models in which faint galaxies have a higher escape fraction compared to bright galaxies are favored by the new data.
Bruton et al. (Thu,) studied this question.