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Properties of H I discs in the Auriga cosmological simulations

Marinacci, F, Grand, RJJ, Pakmor, R, Springel, V, Gómez, FA, Frenk, CS and White, SDM (2017) Properties of H I discs in the Auriga cosmological simulations. Monthly Notices of the Royal Astronomical Society, 466 (4). pp. 3859-3875. ISSN 0035-8711

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We analyse the properties of the H I gas distribution in the Auriga project, a set of magneto-hydrodynamic 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.

Item Type: Article
Additional Information: 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.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press (OUP)
SWORD Depositor: A Symplectic
Date Deposited: 19 Apr 2023 11:10
Last Modified: 19 Apr 2023 11:10
DOI or ID number: 10.1093/mnras/stw3366
URI: https://researchonline.ljmu.ac.uk/id/eprint/19344
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