JAMES BOLTON James.Bolton@nottingham.ac.uk
Professor of Astrophysics
The Sherwood simulation suite: overview and data comparisons with the Lyman-α forest at redshifts 2≤z≤5
Bolton, James S.; Puchwein, Ewald; Sijacki, Debora; Haehnelt, Martin G.; Kim, Tae-Sun; Meiksin, Avery; Regan, John A.; Viel, Matteo
Authors
Ewald Puchwein
Debora Sijacki
Martin G. Haehnelt
Tae-Sun Kim
Avery Meiksin
John A. Regan
Matteo Viel
Abstract
We introduce a new set of large-scale, high-resolution hydrodynamical simulations of the intergalactic medium: the Sherwood simulation suite. These are performed in volumes of 103–1603h−3 comoving Mpc3, span almost four orders of magnitude in mass resolution with up to 17.2 billion particles, and employ a variety of physics variations including warm dark matter and galactic outflows. We undertake a detailed comparison of the simulations to high-resolution, high signal-to-noise observations of the Ly α forest over the redshift range 2 ≤ z ≤ 5. The simulations are in very good agreement with the observational data, lending further support to the paradigm that the Ly α forest is a natural consequence of the web-like distribution of matter arising in Λcold dark matter cosmological models. Only a small number of minor discrepancies remain with respect to the observational data. Saturated Ly α absorption lines with column densities NHI>1014.5cm−2 at 2 < z < 2.5 are underpredicted in the models. An uncertain correction for continuum placement bias is required to match the distribution and power spectrum of the transmitted flux, particularly at z > 4. Finally, the temperature of intergalactic gas in the simulations may be slightly too low at z = 2.7 and a flatter temperature–density relation is required at z = 2.4, consistent with the expected effects of non-equilibrium ionization during He ii reionization.
Citation
Bolton, J. S., Puchwein, E., Sijacki, D., Haehnelt, M. G., Kim, T.-S., Meiksin, A., …Viel, M. (2017). The Sherwood simulation suite: overview and data comparisons with the Lyman-α forest at redshifts 2≤z≤5. Monthly Notices of the Royal Astronomical Society, 464(1), 897-914. https://doi.org/10.1093/mnras/stw2397
Journal Article Type | Article |
---|---|
Acceptance Date | Sep 19, 2016 |
Online Publication Date | Sep 21, 2016 |
Publication Date | Jan 1, 2017 |
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 | 464 |
Issue | 1 |
Pages | 897-914 |
DOI | https://doi.org/10.1093/mnras/stw2397 |
Keywords | methods: numerical, intergalactic medium, quasars: absorption lines |
Public URL | https://nottingham-repository.worktribe.com/output/830542 |
Publisher URL | http://mnras.oxfordjournals.org/content/464/1/897 |
Additional Information | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 Royal Astronomical Society Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Contract Date | Sep 22, 2016 |
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