Effects of Lyman-alpha scattering in the IGM on clustering statistics of Lyman-alpha emitters

Abstract

We investigate the correlations between the observed fraction of Lyman-alpha (Lyα) emission from star-forming galaxies and the large-scale structure by post-processing snapshots of a large, high-resolution hydrodynamical simulation with a Lyα radiative transfer code at redshifts z = 4,3,2. We find correlations of the observed fraction with density, density gradient along the line of sight, velocity, and velocity gradient along the line of sight, all within the same order of magnitude (tens of percent). Additionally, a correlation with the angular momentum of the dark matter halo is detected. In contrast to a previous study, we find no significant deformation of the two-point correlation function due to selection effects from radiative transfer in the intergalactic medium within the limited statistics of the simulation volume. © ESO, 2013.