Simulating galactic outflows with thermal supernova feedback

作者: Joop Schaye , Joop Schaye , Claudio Dalla Vecchia

DOI: 10.1111/J.1365-2966.2012.21704.X

关键词:

摘要: Cosmological simulations make use of sub-grid recipes for the implementation galactic winds driven by massive stars because direct injection supernova energy in thermal form leads to strong radiative losses, rendering feedback inefficient. We argue that main cause catastrophic cooling is a mismatch between mass gas which injected and parent stellar population. Because too much heated, temperatures are low times short. analytic arguments estimate, as function density numerical resolution, minimum heating temperature required be efficiently converted into kinetic energy. then propose test stochastic uses this increase an input parameter can employed both particle-based grid-based codes. smoothed particle hydrodynamic method on models isolated disc galaxies dark matter haloes with total 1010 1012 h−1 M⊙. The strongly suppresses star formation rate drive massive, large-scale outflows without need turn off temporarily. In accordance expectations derived from arguments, sufficiently high resolution results become insensitive imposed jump also agree high-resolution employing feedback.

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