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

Keating, Laura C.; Puchwein, Ewald; Haehnelt, Martin G.; Bird, Simeon; Bolton, James S.


Laura C. Keating

Ewald Puchwein

Martin G. Haehnelt

Simeon Bird


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.


Keating, L. C., Puchwein, E., Haehnelt, M. G., Bird, S., & Bolton, J. 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), 606-626.

Journal Article Type Article
Acceptance Date May 27, 2016
Online Publication Date Jun 15, 2016
Publication Date Sep 1, 2016
Deposit Date Sep 22, 2016
Publicly Available Date Sep 22, 2016
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 461
Issue 1
Pages 606-626
Keywords Galaxies High-redshift, Intergalactic medium, Quasars, Absorption lines, Reionization, First stars
Public URL
Publisher URL
Additional Information This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 the Royal Astronomical Society Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.


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