%0 Generic %1 simpson2014kinetic %A Simpson, Christine M. %A Bryan, Greg L. %A Hummels, Cameron %A Ostriker, Jeremiah P. %D 2014 %K feedback high kinetic resolution supernovae %T Kinetic energy from supernova feedback in high-resolution galaxy simulations %U http://arxiv.org/abs/1410.3822 %X We describe a new method for adding a prescribed amount of kinetic energy to simulated gas modeled on a cartesian grid by directly altering grid cells' mass and velocity in a distributed fashion. The method is explored in the context of supernova feedback in high-resolution hydrodynamic simulations of galaxy formation. In idealized tests at varying background densities and resolutions, we show convergence in behavior between models with different initial kinetic energy fractions at low densities and/or at high resolutions. We find that in high density media ($\gtrsim$ 50 cm$^-3$) with coarse resolution ($4$ pc per cell), results are sensitive to the initial fraction of kinetic energy due to the early rapid cooling of thermal energy. We describe and test a resolution dependent scheme for adjusting this fraction that approximately replicates our high-resolution tests. We apply the method to a prompt supernova feedback model, meant to mimic Type II supernovae, in a cosmological simulation of a $10^9$ Msun halo. We find that depositing small amounts of supernova energy in kinetic form (as little as 1%) has a dramatic impact on the evolution of the system, resulting in an order of magnitude suppression of stellar mass. We discuss the distribution of stellar metallicities in the resulting system and find that while the mean metallicity is much more consistent with observations than in previous models, significant discrepancies remain that are likely due to our simplistic assumptions for the source of stellar feedback that neglect contributions from Type Ia supernovae and stellar winds.

@misc{simpson2014kinetic, abstract = {We describe a new method for adding a prescribed amount of kinetic energy to simulated gas modeled on a cartesian grid by directly altering grid cells' mass and velocity in a distributed fashion. The method is explored in the context of supernova feedback in high-resolution hydrodynamic simulations of galaxy formation. In idealized tests at varying background densities and resolutions, we show convergence in behavior between models with different initial kinetic energy fractions at low densities and/or at high resolutions. We find that in high density media ($\gtrsim$ 50 cm$^{-3}$) with coarse resolution ($\gtrsim 4$ pc per cell), results are sensitive to the initial fraction of kinetic energy due to the early rapid cooling of thermal energy. We describe and test a resolution dependent scheme for adjusting this fraction that approximately replicates our high-resolution tests. We apply the method to a prompt supernova feedback model, meant to mimic Type II supernovae, in a cosmological simulation of a $10^9$ Msun halo. We find that depositing small amounts of supernova energy in kinetic form (as little as 1%) has a dramatic impact on the evolution of the system, resulting in an order of magnitude suppression of stellar mass. We discuss the distribution of stellar metallicities in the resulting system and find that while the mean metallicity is much more consistent with observations than in previous models, significant discrepancies remain that are likely due to our simplistic assumptions for the source of stellar feedback that neglect contributions from Type Ia supernovae and stellar winds.}, added-at = {2014-10-16T10:07:49.000+0200}, author = {Simpson, Christine M. and Bryan, Greg L. and Hummels, Cameron and Ostriker, Jeremiah P.}, biburl = {https://www.bibsonomy.org/bibtex/2c734bc2c8871edefc18ec0713259668c/miki}, description = {[1410.3822] Kinetic energy from supernova feedback in high-resolution galaxy simulations}, interhash = {814ce6d813e32bf8ce7fb520f9b482d8}, intrahash = {c734bc2c8871edefc18ec0713259668c}, keywords = {feedback high kinetic resolution supernovae}, note = {cite arxiv:1410.3822Comment: 22 pages, 15 figures, submitted to ApJ}, timestamp = {2014-10-16T10:07:49.000+0200}, title = {Kinetic energy from supernova feedback in high-resolution galaxy simulations}, url = {http://arxiv.org/abs/1410.3822}, year = 2014 }