Testing the effect of galactic feedback on the IGM at z ∼ 6 with metal-line absorbers
Keating, Laura C. and Puchwein, Ewald and Haehnelt, Martin G. and Bird, Simeon and Bolton, James S. (2016) Testing the effect of galactic feedback on the IGM at z ∼ 6 with metal-line absorbers. Monthly Notices of the Royal Astronomical Society, 461 (1). pp. 606-626. ISSN 1365-2966
Official URL: http://mnras.oxfordjournals.org/content/461/1/606
We present models of low- and high-ionization metal-line absorbers (O i, C ii, C iv and Mg ii) 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 of metal-line absorbers varies with the galactic wind prescription. We find that the O i and C ii absorbers are reasonably insensitive to the feedback scheme. All models, however, struggle to reproduce the observations of C iv and Mg ii, which are probing down to lower overdensities than O i 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.
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