Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-09
Astronomy and Astrophysics
Astrophysics
To appear in the proceedings of IAU Symposium 245, "Formation and Evolution of Galaxy Bulges. This version contains larger fig
Scientific paper
10.1017/S1743921308017213
Although supernova explosions and stellar winds happens at scales bellow 100 pc, they affect the interstellar medium(ISM) and galaxy formation. We use cosmological N-body+Hydrodynamics simulations of galaxy formation, as well as simulations of the ISM to study the effect of stellar feedback on galactic scales. Stellar feedback maintains gas with temperatures above a million degrees. This gas fills bubbles, super-bubbles and chimneys. Our model of feedback, in which 10%-30% of the feedback energy is coming from runaway stars, reproduces this hot gas only if the resolution is better than 50 pc. This is 10 times better than the typical resolution in cosmological simulations of galaxy formation. Only with this resolution, the effect of stellar feedback in galaxy formation is resolved without any assumption about sub-resolution physics. Stellar feedback can regulate the formation of bulges and can shape the inner parts of the rotation curve.
Ceverino Daniel
Klypin Anatoly
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