  We build a physical model for high-redshift Lyman Alpha emitters (LAEs) by
coupling state of the art cosmological simulations (GADGET-2) with a dust model
and a radiative transfer code (pCRASH). We post-process the cosmological
simulation with pCRASH using five different values of the escape fraction of
hydrogen ionizing photons (f_esc=0.05,0.25,0.5,0.75,0.95) until reionization is
complete, i.e. the average neutral hydrogen fraction drops to <X_HI>~10^-4.
Then, the only free-parameter left to match model results to the observed Lya
and UV luminosity functions of LAEs at z~6.6 is the relative escape of Lyman
Alpha (Lya) and continuum photons from the galactic environment (f_alpha/f_c).
We find a three-dimensional degeneracy such that the theoretical model can be
reconciled with observations for an IGM Lya transmission <T_alpha>_LAE~38-50%
(which translates to <X_HI>~0.5-10^-4 for Gaussian emission lines),
f_esc~0.05-0.50 and f_alpha/f_c~0.6-1.8.
