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The parametrization of gas flows in discs in the Auriga simulations

Okalidis, P, Grand, RJJ, Yates, RM and Kauffmann, G (2021) The parametrization of gas flows in discs in the Auriga simulations. Monthly Notices of the Royal Astronomical Society, 504 (3). pp. 4400-4415. ISSN 0035-8711

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We study the radial motions of cold, star-forming gas in the secular evolution phase of a set of 14 magnetohydrodynamical cosmological zoom-in simulations of Milky Way-mass galaxies. We study the radial transport of material within the disc plane in a series of concentric rings. For the gas in each ring at a given time we compute two quantities as a function of time and radius: (1) the radial bulk flow of the gas and (2) the radial spread of the gas relative to the bulk flow. Averaging the data from all the haloes, we find that the radial spread increases with radius in the form of a power law with strong secondary dependencies on the fraction of accreted material and the local radial velocity dispersion of the gas. We find that the bulk motion of gas is well described in the inner disc regions by a radially independent mean inwards flow speed of $-2.4\, \rm {km\ s} {-1}$. The spread around this value relates to the change in angular momentum of the gas and also the amount of accreted material. These scalings from fully cosmological, MHD simulations of galaxy formation can then be used in semi-Analytic models to better parametrize the radial flow of gas in discs.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 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: 20 Apr 2023 10:52
Last Modified: 20 Apr 2023 10:52
DOI or ID number: 10.1093/mnras/stab1142
URI: https://researchonline.ljmu.ac.uk/id/eprint/19287
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