%0 Generic %1 Hopkins2011 %A Hopkins, Philip F. %A Quataert, Eliot %A Murray, Norman %D 2011 %K feedback outflows simulation stellar %T Stellar Feedback in Galaxies and the Origin of Galaxy-scale Winds %U http://arxiv.org/abs/1110.4638 %X Feedback from massive stars is believed to play a critical role in driving galactic super-winds that enrich the IGM and shape the galaxy mass function and mass-metallicity relation. In previous papers, we introduced new numerical methods for implementing stellar feedback on sub-GMC through galactic scales in galaxy simulations. This includes radiation pressure (UV through IR), SNe (Type-I & II), stellar winds ('fast' O-star through 'slow' AGB winds), and HII photoionization. Here, we show that these feedback mechanisms drive galactic winds with outflow rates as high as ~10-20 times the galaxy SFR. The mass-loading efficiency (wind mass loss rate divided by SFR) scales inversely with circular velocity, consistent with momentum-conservation expectations. We study the contributions of each feedback mechanism to galactic winds in a range of galaxy models, from SMC-like dwarfs & MW-analogues to z~2 clumpy disks. In massive, gas-rich systems (local starbursts and high-z galaxies), radiation pressure dominates the wind generation. For MW-like spirals and dwarf galaxies the gas densities are much lower, and shock-heated gas from SNe and stellar winds dominates production of large-scale outflows. In all models, however, winds have a multi-phase structure that depends on interactions between multiple feedback mechanisms operating on different spatial & time scales: any single mechanism fails to reproduce the winds observed. We provide fitting functions for wind mass-loading and velocities as a function of galaxy properties, for use in cosmological simulations and semi-analytic models. These differ from typically-adopted formulae with explicit dependence on gas surface density that can be very important in both low-density dwarf galaxies and high-density gas-rich galaxies.

@misc{Hopkins2011, abstract = { Feedback from massive stars is believed to play a critical role in driving galactic super-winds that enrich the IGM and shape the galaxy mass function and mass-metallicity relation. In previous papers, we introduced new numerical methods for implementing stellar feedback on sub-GMC through galactic scales in galaxy simulations. This includes radiation pressure (UV through IR), SNe (Type-I & II), stellar winds ('fast' O-star through 'slow' AGB winds), and HII photoionization. Here, we show that these feedback mechanisms drive galactic winds with outflow rates as high as ~10-20 times the galaxy SFR. The mass-loading efficiency (wind mass loss rate divided by SFR) scales inversely with circular velocity, consistent with momentum-conservation expectations. We study the contributions of each feedback mechanism to galactic winds in a range of galaxy models, from SMC-like dwarfs & MW-analogues to z~2 clumpy disks. In massive, gas-rich systems (local starbursts and high-z galaxies), radiation pressure dominates the wind generation. For MW-like spirals and dwarf galaxies the gas densities are much lower, and shock-heated gas from SNe and stellar winds dominates production of large-scale outflows. In all models, however, winds have a multi-phase structure that depends on interactions between multiple feedback mechanisms operating on different spatial & time scales: any single mechanism fails to reproduce the winds observed. We provide fitting functions for wind mass-loading and velocities as a function of galaxy properties, for use in cosmological simulations and semi-analytic models. These differ from typically-adopted formulae with explicit dependence on gas surface density that can be very important in both low-density dwarf galaxies and high-density gas-rich galaxies. }, added-at = {2011-10-24T18:32:42.000+0200}, author = {Hopkins, Philip F. and Quataert, Eliot and Murray, Norman}, biburl = {https://www.bibsonomy.org/bibtex/2bbc7b5c5e125253de6132bc5a5685ad6/miki}, description = {[1110.4638] Stellar Feedback in Galaxies and the Origin of Galaxy-scale Winds}, interhash = {b9b3b7c1a50a8785ad1c4cc9fb437b25}, intrahash = {bbc7b5c5e125253de6132bc5a5685ad6}, keywords = {feedback outflows simulation stellar}, note = {cite arxiv:1110.4638 Comment: 16 pages, 11 figures, submitted to MNRAS}, timestamp = {2011-10-24T18:32:42.000+0200}, title = {Stellar Feedback in Galaxies and the Origin of Galaxy-scale Winds}, url = {http://arxiv.org/abs/1110.4638}, year = 2011 }