The processes of reionization simulated with the LICORICE and 21cmFAST codes

Abstract

One of the possible sources of an anisotropy in the power spectrum of 21cm brightness fluctuations from the epoch of reionization (EoR) is the delay in light traveltime along the line-of-sight (LOS). We examine the anisotropy between the parallel and transverse directions with respect to the LOS. The inhomogeneous distribution of ionized clouds at the redshift of z > 6 should provide an enhanced level of inhomogeneity in the Thomson optical depth. Evolution of the optical depth, the correlation function of ionization field and the differential brightness temperature of the 21 cm signal at the EoR are evaluated with the LICORICE and 21cmFAST codes.