Mathematics – Logic
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21811901v&link_type=abstract
American Astronomical Society, AAS Meeting #218, #119.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
We present cosmological hydrodynamics simulations to study galaxy formation using the moving mesh code AREPO. We introduce the simulations, numerical techniques and discuss results of the global baryon statistics. Our simulations include primordial cooling taking into account photo-ionization due to a spatially uniform UV background, a two-phase model to describe gas of the interstellar medium, and a star formation method. To contrast our results to previous calculations with a similar physics implementation, we repeat all simulations with the well-tested SPH-code GADGET. Both codes use an identical gravity solver and include the same sub-resolution physics, but use a completely different method to solve the inviscid Euler equations. This allows us to estimate the impact of hydro solver uncertainties on the results of cosmological hydrodynamics calculations. The global baryon statistics differ between the two simulation methods significantly. AREPO shows systematically higher star formation rates, lower mean temperatures over the simulation volume and different mass fractions in gas phases. Although both codes use the same cooling implementation, the cooling rates in AREPO are larger than those in GADGET. These systematic differences demonstrate that inaccuracies in hydro solvers can lead to comparatively large uncertainties in the baryon characteristics.
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