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

McCarthy, IG and Schaye, J and Font, AS and Theuns, T and Frenk, CS and Crain, RA 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. ISSN 0035-8711

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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 . log10[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 star formation 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 imple-
mentation of the “subgrid” astrophysical processes thought to be relevant to galaxy formation.

Key words: galaxies: evolution—galaxies: formation—galaxies: general—galaxies: haloes — galaxies: stellar content — galaxies: structure

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record MNRAS (2002) 427(1), 379-392 is available online at: http://dx.doi.org/10.1111/j.1365-2966.2012.21951.x
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 11 Feb 2015 13:51
Last Modified: 08 Sep 2017 19:09
DOI or Identification number: 10.1111/j.1365-2966.2012.21951.x
URI: http://researchonline.ljmu.ac.uk/id/eprint/443

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