Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.2107t&link_type=abstract
American Astronomical Society Meeting 208, #21.07; Bulletin of the American Astronomical Society, Vol. 38, p.102
Astronomy and Astrophysics
Astronomy
Scientific paper
Star formation and feedback mechanisms in galaxy discs are complicated processes, largely due to the complex nature of the gas in the interstellar medium. When modelling, it is therefore common to either simplify the gas structure to study global properties of the disc, or to cut out star formation completely and model the gas on small scales. In this research, we have attempted to breach this gap by looking at a 3-dimensional global model of a Milky-Way sized galaxy at high resolution. We have used the hydrodynamics grid-based code, Enzo, for this work which follows the formation of gravitational instabilities in an isolated disc, the resulting global star formation properties and the effects of feedback from type II supernovae. Our models agree well with the observed cut-off radius for star formation as quantified by the Toomre Q parameter and reproduce the observed slope of the Schmidt law. The addition of feedback drives gas out of the disc plane to produce a galactic fountain. Our galaxy forms a multi-phase interstellar medium in rough pressure equilibrium within the disc, but with a wide range of pressures, especially in the feedback case.
Bryan Greg L.
Tasker Elizabeth J.
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