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Although supernova explosions and stellar winds happens at scales bellow 100pc, they affect the interstellar medium(ISM) and galaxy formation. We usecosmological N-body+Hydrodynamics simulations of galaxy formation, as well assimulations of the ISM to study the effect of stellar feedback on galacticscales. Stellar feedback maintains gas with temperatures above a milliondegrees. This gas fills bubbles, super-bubbles and chimneys. Our model offeedback, 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 10times better than the typical resolution in cosmological simulations of galaxyformation. Only with this resolution, the effect of stellar feedback in galaxyformation is resolved without any assumption about sub-resolution physics.Stellar feedback can regulate the formation of bulges and can shape the innerparts of the rotation curve.

The role of Stellar Feedback in the formation of galactic disks and bulges in a LCDM Universe