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Rotation rates, sizes, and star formation efficiencies of a representative population of simulated disc galaxies | | Ian G. McCarthy
; Joop Schaye
; Andreea S. Font
; Tom Theuns
; Carlos S. Frenk
; Robert A. Crain
; Claudio Dalla Vecchia
; | | Date: |
23 Apr 2012 | | 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[Mstar (Msun)] < 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, and the SF
efficiencies of disc galaxies as inferred from stacked weak lensing and stacked
satellite kinematics observations. At higher stellar masses, log10[Mstar
(Msun)] > 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 realistic and representative
population of disc galaxies using standard numerical hydrodynamic techniques
and a plausible implementation of the "subgrid" astrophysical processes thought
to be relevant to galaxy formation. | | Source: | arXiv, 1204.5195 | | Services: | Forum | Review | PDF | Favorites | |
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