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z ~ 6 metal-line absorbers as a probe of galactic feedback models

Published online by Cambridge University Press:  21 March 2017

Laura C. Keating ,
Ewald Puchwein ,
Martin G. Haehnelt ,
Simeon Bird  and
James S. Bolton
Laura C. Keating
Affiliation:
Institute of Astronomy and Kavli Institute for Cosmology, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK
Ewald Puchwein
Affiliation:
Institute of Astronomy and Kavli Institute for Cosmology, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK
Martin G. Haehnelt
Affiliation:
Institute of Astronomy and Kavli Institute for Cosmology, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK
Simeon Bird
Affiliation:
Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA
James S. Bolton
Affiliation:
School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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Abstract

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Observations of metal absorption lines in the spectra of QSOs out to z > 6 are providing an important probe into the enrichment and ionization state of the intergalactic medium (IGM) at the tail end of reionization. Using simulations with four different feedback models, including the Illustris and Sherwood simulations, we investigate how the overall incidence rate and equivalent width distribution of metal-line absorbers varies with the galactic wind scheme. The low-ionization absorbers are reasonably insensitive to the feedback implementation, with all models reasonably close to the observed incidence rate of O i absorbers. However, all of our models struggle to reproduce the observations of C iv, which is probing overdensities close to the mean at z ~ 6, suggesting that the metals are not being transported out into the IGM efficiently enough in these simulations.

Keywords

intergalactic mediumgalaxies: high-redshiftquasars: absorption linesmethods: numerical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 75 - 77
Copyright
Copyright © International Astronomical Union 2017 

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