Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Barred galaxies in the EAGLE cosmological hydrodynamical simulation   We examine the properties of barred disc galaxies in a LCDM 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
Mstr /M < 11. These discs show a wide range of bar strengths, from unbarred
discs to weak bars to strongly barred systems (= 20%). Bars in these systems
develop after redshift = 1.3, on timescales that depend sen- sitively on the
strength of the pattern. Strong bars develop relatively quickly (in a few Gyr,
= 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 gravitation- ally 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 have corota- tion 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 LCDM.

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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: solv-int