Paul Torrey, Mark Vogelsberger, Debora Sijacki, Volker Springel, Lars Hernquist
We compare the structural properties of galaxies formed in cosmological
simulations using the smoothed particle hydrodynamics (SPH) code GADGET with
those using the moving-mesh code AREPO. Both codes employ identical gravity
solvers and the same sub-resolution physics but use very different methods to
track the hydrodynamic evolution of gas. This permits us to isolate the effects
of the hydro solver on the formation and evolution of galactic disks. In a
matching sample of GADGET and AREPO haloes we fit simulated gas disks with
exponential profiles. We find that the cold gas disks formed using AREPO have
systematically larger disk scale lengths and higher specific angular momenta
than their GADGET counterparts. The reason for these differences is rooted in
the inaccuracies of the SPH solver and calls for a reassessment of commonly
adopted feedback prescriptions in cosmological simulations.
View original:
http://arxiv.org/abs/1110.5635
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