A New Model For Including Galactic Winds in Simulations of Galaxy Formation II: Implementation of PhEW in Cosmological Simulations

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dc.contributor.authorHuang, Shuiyao
dc.contributor.authorKatz, Neal
dc.contributor.authorDave, Romeel
dc.date.accessioned2021-08-31T17:08:57Z
dc.date.available2021-08-31T17:08:57Z
dc.date.issued2021
dc.description.abstractAlthough galactic winds play a critical role in regulating galaxy formation, hydrodynamic cosmological simulations do not resolve the scales that govern the interaction between winds and the ambient circumgalactic medium (CGM). We implement the Physically Evolved Wind (PhEW) model of Huang et al. (2020) in the GIZMO hydrodynamics code and perform test cosmological simulations with different choices of model parameters and numerical resolution. PhEW adopts an explicit subgrid model that treats each wind particle as a collection of clouds that exchange mass, metals, and momentum with their surroundings and evaporate by conduction and hydrodynamic instabilities as calibrated on much higher resolution cloud scale simulations. In contrast to a conventional wind algorithm, we find that PhEW results are robust to numerical resolution and implementation details because the small scale interactions are defined by the model itself. Compared to conventional wind simulations with the same resolution, our PhEW simulations produce similar galaxy stellar mass functions at z ≥ 1 but are in better agreement with low-redshift observations at M∗ < 1011M⊙ because PhEW particles shed mass to the CGM before escaping low mass halos. PhEW radically alters the CGM metal distribution because PhEW particles disperse metals to the ambient medium as their clouds dissipate, producing a CGM metallicity distribution that is skewed but unimodal and is similar between cold and hot gas. While the temperature distributions and radial profiles of gaseous halos are similar in simulations with PhEW and conventional winds, these changes in metal distribution will affect their predicted UV/X-ray properties in absorption and emission.en_US
dc.identifier.citationHuang et al., 2020. A new model for including galactic winds in simulations of galaxy formation – I. Introducing the Physically Evolved Winds (PhEW) model. Monthly Notices of the Royal Astronomical Society, 497(3), pp.2586-2604.en_US
dc.identifier.urihttp://hdl.handle.net/10566/6569
dc.language.isoenen_US
dc.publisherMonthly Notices of the Royal Astronomical Societyen_US
dc.subjecthydrodynamicsen_US
dc.subjectmethods: analyticalen_US
dc.subjectgalaxies: outflowen_US
dc.titleA New Model For Including Galactic Winds in Simulations of Galaxy Formation II: Implementation of PhEW in Cosmological Simulationsen_US
dc.typeArticleen_US

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