First results of an observational test of a double reionization scenario by searching for galaxies at high redshift

The study of high redshift galaxies is crucial for understanding the reionization process, the formation and evolution of galaxies, and the large-scale structure in the Universe. The main goal of this project was to obtain an ultra-deep image taken with a narrow-band filter (FWHM = 11nm and central wavelength c = 1.254 m), designed by the ALBA team, and installed in the CIRCE nIR camera for GTC, with the aim of detecting LAEs (Luminous Lyman- Emitters) at z = 9.3 by the flux excess due to their Ly emission. In this sense, this project would allow to support or reject the double reionization scenario predicted by the AMIGA model (Salvador-Sole 2015). The ultra-deep image has been obtained within the Extended Groth Strip (EGS) eld, reaching a limiting AB magnitude 22 in the ALBA narrow-band filter. With this depth we could not detect any candidate for LAE at high redshift. In addition, we have performed a scientific analysis of some properties of the identified galaxies, gathering the available ancillary information of these objects from the 3D-HST and CANDELS surveys.