Mathematics – Logic
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21811902k&link_type=abstract
American Astronomical Society, AAS Meeting #218, #119.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
We present new type of cosmological hydrodynamic simulations to study formation of galaxies. Simulations were performed using newly developed moving mesh code AREPO in a cosmological box evolved to z=0. We compare the results from this new technique to the results from well-tested SPH code GADGET-3 which uses identical gravity solver, which enables to cleanly test the differences in hydrodynamics. We found several important, systematic differences in properties of galaxies and gaseous components of halos. These include significantly more extended disks and faster cooling of the hot halo gas in massive halos in AREPO. Owing to hierarchical nature of halo and galaxy buildup these differences than propagate to many other properties of simulated halos and galaxies. Given the advantages of hydrodynamic scheme in AREPO in idealized test problems, as well as tests we did in cosmological environment, our new findings are questioning reliability of some the previous results based on SPH technique.
Hernquist Lars
Keres Dusan
Springel Volker
Vogelsberger Mark
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