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We investigate the cosmic reionization history by comparing semi-analyticalmodels of the Lya forest with observations of high-z quasars and gamma raybursts absorption spectra. In order to constrain the reionization epoch z_rei,we consider two physically motivated scenarios in which reionization endseither early (ERM, z_rei>= 7) or late (LRM, z_rei~6). We analyze thetransmitted flux in a sample of 17 quasars spectra at 5.7<z<6.4 and in thespectrum of the gamma ray burst 050904 at z=6.3, studying the wide darkportions (gaps) in the observed absorption spectra. By comparing the statisticsof these spectral features with our models, we conclude that currentobservational data do not require any sudden change in the ionization state ofthe IGM at z~6, favouring indeed a highly ionized Universe at these epochs, aspredicted by the ERM. Moreover, we test the predictions of this model throughLya emitters observations, finding that the ERM provide a good fit to theevolution of the luminosity function of Lya emitting galaxies in the redshiftrange z=5.7-6.5. The overall result points towards an extended reionizationprocess which starts at z>=11 and completes at z_rei>=7, in agreement with therecent WMAP5 data.

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