Abstract
In this thesis we have implemented a basic radiative transfer code to model the radial Lyα scattering rate around the epoch when the first stars and galaxies start forming, and ionizing their surroundings. The model, builds on a previous model determining the resonance scattering location using wing scattering from a central source with a UV powerlaw spectrum, and in addition includes absorption lines from atomic and molecular hydrogen, and ionizing bubbles. We have shown that these will suppress scattering on small scales, and thus enhance the relative scattering rate on scales of 10 – 10 2 h −1 Mpc comoving.