A subresolution multiphase interstellar medium model of star formation and supernova energy feedback

摘要: We present a new multiphase subresolution model for star formation and feedback in smoothed particle hydrodynamics (SPH) numerical simulations of galaxy formation. Our model, called MUPPI (MUlti-Phase Particle Integrator), describes each gas as system, with cold hot phases, coexisting pressure equilibrium stellar component. Cooling the tenuous phase feeds phase. compute molecular fraction using phenomenological relation Blitz & Rosolowsky between this external disc pressure, which we identify SPH pressure. Stars are formed out given efficiency, scales dynamical time prescription is not based on imposing Schmidt–Kennicutt relation, instead naturally produced by MUPPI. Energy from supernova explosions deposited partly into particles, to that neighbouring particles. Mass energy flows among different phases described set ordinary differential equations explicitly integrate particle, relying solutions. This system also includes response structure changes associated thermodynamics gas. has an intrinsically runaway behaviour: supernovae increases turn rate through fraction. stabilized hydrodynamic gas: when it receives enough energy, expands thereby decreasing its pressure. We apply our two isolated spherical cooling flows. able reproduce galaxies. It reproduces basic properties interstellar medium galaxies, surface densities gas, stars rate, vertical velocity dispersion clouds connected galactic fountains. Quite remarkably, provides efficient without need include scheme kinetic feedback.