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Constraining cosmic reionization with quasar, gamma ray burst, and Lya emitter observations

We investigate the cosmic reionization history by comparing semi-analytical models of the Lya forest with observations of high-z quasars and gamma ray bursts absorption spectra. In order to constrain the reionization epoch z_rei, we consider two physically motivated scenarios in which reionization ends either early (ERM, z_rei>= 7) or late (LRM, z_rei~6). We analyze the transmitted flux in a sample of 17 quasars spectra at 5.7 =11 and completes at z_rei>=7, in agreement with the recent WMAP5 data.