Testing the effect of galactic feedback on the IGM at z ~ 6 with metal-line absorbers

Abstract

We present models of low- and high-ionization metal-line absorbers (OI, CII, CIV and MgII) during the end of the reionization epoch, at z ~ 6. Using four cosmological hydrodynamical simulations with different feedback schemes (including the Illustris and Sherwood simulations) and two different choices of hydro-solver, we investigate how the overall incidence rate and equivalent width distribution ofmetal-line absorbers varies with the galactic wind prescription. We find that the OI and C II absorbers are reasonably insensitive to the feedback scheme. All models, however, struggle to reproduce the observations of C IV and MgII, which are probing down to lower overdensities than OI and C II at z ~ 6, suggesting that the metals in the simulations are not being transported out into the intergalactic medium efficiently enough. The situation is improved but not resolved if we choose a harder (but still reasonable) and/or (locally) increased UV background at z ~ 6.