The Universe's re-ionisation is at the forefront of research. How the re-ionisation occurred is however still not known. This project intents to understand the mechanisms that produce the reionsation. Besides it deals with the most active sources that  take part in the re-ionisation. In this project we will emphasised the study of LAEs with double peak Lyα. These double peaks are a sign that the sources are immersed in an ionised bubble. Besides the emit to the IGM the excess continuum ionised photons, thus contributing to ionise the medium. Thus, this way we attempt to study their ionised bubbles and the sources that produce the re-ionisation. We expect to produce three papers.