The visibility of Lyman Alpha Emitters: constraining reionization, ionizing photons and dust

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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 (fₑsc=0.05,0.25,0.5,0.75,0.95) until reionization is complete, i.e. the average neutral hydrogen fraction drops to <XₕI> 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 (fₐlpha/fc). We find a three-dimensional degeneracy such that the theoretical model can be reconciled with observations for an IGM Lya transmission <Tₐlpha>ₗAE 38-50% (which translates to <XₕI> 0.5-10-4 for Gaussian emission lines), fₑsc 0.05-0.50 and fₐlpha/fc 0.6-1.8.