F. Marinacci
Properties of HI discs in the Auriga cosmological simulations
Marinacci, F.; Grand, R.J.J.; Pakmor, R.; Springel, V.; Gómez, F.A.; Frenk, C.S.; White, S.D.M.
Authors
R.J.J. Grand
R. Pakmor
V. Springel
F.A. Gómez
Professor Carlos Frenk c.s.frenk@durham.ac.uk
Professor
S.D.M. White
Abstract
We analyse the properties of the H i gas distribution in the Auriga project, a set of magnetohydrodynamic cosmological simulations performed with the moving-mesh code arepo and a physics model for galaxy formation that succeeds in forming realistic late-type galaxies in the 30 Milky Way-sized haloes simulated in this project. We use a simple approach to estimate the neutral hydrogen fraction in our simulation set, which treats low-density and star-forming gas separately, and we explore two different prescriptions to subtract the contribution of molecular hydrogen from the total H i content. The H i gas in the vast majority of the systems forms extended discs although more disturbed morphologies are present. Notwithstanding the general good agreement with observed H i properties – such as radial profiles and the mass–diameter relation – the Auriga galaxies are systematically larger and more gas-rich than typical nearby galaxies. Interestingly, the amount of H i gas outside the disc plane correlates with the star formation rate, consistent with a picture where most of this extra-planar H i gas originates from a fountain-like flow. Our findings are robust with respect to the different assumptions adopted for computing the molecular hydrogen fraction and do not vary significantly over a wide range of numerical resolution. The H i modelling introduced in this paper can be used in future work to build artificial interferometric H i data cubes, allowing an even closer comparison of the gas dynamics in simulated galaxies with observations.
Citation
Marinacci, F., Grand, R., Pakmor, R., Springel, V., Gómez, F., Frenk, C., & White, S. (2017). Properties of HI discs in the Auriga cosmological simulations. Monthly Notices of the Royal Astronomical Society, 466(4), 3859-3875. https://doi.org/10.1093/mnras/stw3366
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 22, 2016 |
Online Publication Date | Jan 18, 2017 |
Publication Date | May 1, 2017 |
Deposit Date | Feb 27, 2017 |
Publicly Available Date | Mar 2, 2017 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 466 |
Issue | 4 |
Pages | 3859-3875 |
DOI | https://doi.org/10.1093/mnras/stw3366 |
Public URL | https://durham-repository.worktribe.com/output/1362502 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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