%0 Generic %1 Torrey2011 %A Torrey, Paul %A Vogelsberger, Mark %A Sijacki, Debora %A Springel, Volker %A Hernquist, Lars %D 2011 %K arepo disk simulation size sph %T Moving Mesh Cosmology: Properties of Gas Disks %U http://arxiv.org/abs/1110.5635 %X 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.

@misc{Torrey2011, abstract = { 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. }, added-at = {2011-10-27T18:13:19.000+0200}, author = {Torrey, Paul and Vogelsberger, Mark and Sijacki, Debora and Springel, Volker and Hernquist, Lars}, biburl = {https://www.bibsonomy.org/bibtex/23147ca16be73dc5710933bdde1574915/miki}, description = {[1110.5635] Moving Mesh Cosmology: Properties of Gas Disks}, interhash = {d1f9bda26530e974d5b0e9cb5b50cfb5}, intrahash = {3147ca16be73dc5710933bdde1574915}, keywords = {arepo disk simulation size sph}, note = {cite arxiv:1110.5635 Comment: 5 pages, 4 figures, MNRAS submitted. Movies and high-resolution images can be found at http://www.cfa.harvard.edu/itc/research/movingmeshcosmology}, timestamp = {2011-10-27T18:13:19.000+0200}, title = {Moving Mesh Cosmology: Properties of Gas Disks}, url = {http://arxiv.org/abs/1110.5635}, year = 2011 }