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Rotation rates, sizes and star formation efficiencies of a representative population of simulated disc galaxies.

McCarthy, I. G. and Schaye, J. and Font, A. S. and Theuns, T. and Frenk, C. S. and Crain, R. A. and Dalla Vecchia, C. (2012) 'Rotation rates, sizes and star formation efficiencies of a representative population of simulated disc galaxies.', Monthly notices of the Royal Astronomical Society., 427 (1). pp. 379-392.

Abstract

We examine the rotation rates, sizes and star formation (SF) efficiencies of a representative population of simulated disc galaxies extracted from the Galaxies–Intergalactic Medium Interaction Calculation (GIMIC) suite of cosmological hydrodynamic simulations. These simulations include efficient, but energetically feasible supernova feedback, but have not been tuned in any way to produce ‘realistic’ disc galaxies. Yet, they generate a large number of discs, without requiring extremely high resolution. Over the wide galaxy stellar mass range, 9.0 ≲ log 10 [M*(M⊙)] < 10.5, the simulations reproduce the observed Tully–Fisher relation, the rotation curves of disc galaxies in bins of stellar mass, the mass–size relation of disc galaxies, the optical rotation to virial circular velocity ratio (‘Vopt/Vvir’) and the SF efficiencies of disc galaxies as inferred from stacked weak lensing and stacked satellite kinematics observations. They also reproduce the specific star formation rates of ∼L* galaxies but predict too low levels of SF for low-mass galaxies, which is plausibly due to the finite resolution of the simulations. At higher stellar masses, log10[M*(M⊙)] > 10.6, the simulated galaxies are too concentrated and have too high SF efficiencies. We conjecture that this shortcoming reflects the neglect of feedback from accreting supermassive black holes in these simulations. We conclude that it is possible to generate a representative population of disc galaxies that reproduces many of the observed trends of local disc galaxies using standard numerical hydrodynamic techniques and a plausible implementation of the ‘subgrid’ astrophysical processes thought to be relevant to galaxy formation.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1111/j.1365-2966.2012.21951.x
Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:16 August 2012
Date deposited:26 April 2016
Date of first online publication:28 January 2013
Date first made open access:No date available

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