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Barred galaxies in the EAGLE cosmological hydrodynamical simulation

Algorry, DG and Navarro, JF and Abadi, MG and Sales, LV and Bower, RG and Crain, RA and Dalla Vecchia, C and Frenk, CS and Schaller, M and Schaye, J and Theuns, T (2017) Barred galaxies in the EAGLE cosmological hydrodynamical simulation. Monthly Notices of the Royal Astronomical Society. ISSN 0035-8711

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Abstract

We examine the properties of barred disc galaxies in a ΛCDM cosmological hydrodynamical simulation from the EAGLE project. Our study follows the formation of 269 discs identified at z = 0 in the stellar mass range 10.6 < log M★/M⊙ < 11. These discs show a wide range of bar strengths, from unbarred discs (≈60%) to weak bars (≈20%) to strongly barred systems (≈20%). Bars in these systems develop after redshift ≈1.3, on timescales that depend sensitively on the strength of the pattern. Strong bars develop relatively quickly (in a few Gyr, or roughly ∼10 disc rotation periods) in systems that are disc dominated, gas poor, and have declining rotation curves. Weak bars develop more slowly in systems where the disc is less gravitationally important, and are still growing at z = 0. Unbarred galaxies are comparatively gas-rich discs whose rotation speeds do not exceed the maximum circular velocity of the halos they inhabit. Bar lengths compare favourably with observations, ranging from 0.2 to 0.8 times the radius containing 90% of the stars. Bars slow down remarkably quickly as they grow, causing the inner regions of the surrounding dark halo to expand. At z = 0 strong bars in simulated galaxies have corotation radii roughly ten times the bar length. Such slow bars are inconsistent with the few cases where pattern speeds have been measured or inferred observationally, a discrepancy that, if confirmed, might prove a challenge for disc galaxy formation in ΛCDM.

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.
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 11 May 2017 10:11
Last Modified: 11 May 2017 10:11
DOI or Identification number: 10.1093/mnras/stx1008
URI: http://researchonline.ljmu.ac.uk/id/eprint/6405

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