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Theoretical models of galaxy formation based on the cold dark mattercosmogony typically require strong feedback from supernova (SN) explosions inorder to reproduce the Milky Way satellite galaxy luminosity function and thefaint end of the field galaxy luminosity function. However, too strong a SNfeedback also leads to the universe reionizing too late, and the metallicitiesof Milky Way satellites being too low. The combination of these fourobservations therefore places tight constraints on SN feedback. We investigatethese constraints using the semi-analytical galaxy formation model galform. Wefind that these observations favour a SN feedback model in which the feedbackstrength evolves with redshift. We find that, for our best fit model, half ofthe ionizing photons are emitted by galaxies with rest-frame far-UV absolutemagnitudes $M_{\rm AB}(1500{\rm \AA})<-17.5$, which implies that alreadyobserved galaxy populations contribute about half of the photons responsiblefor reionization. The $z=0$ descendants of these galaxies are mainly galaxieswith stellar mass $M_*>10^{10}\,{\rm M}_{\odot}$ and preferentially inhabithalos with mass $M_{\rm halo}>10^{13}\,{\rm M}_{\odot}$.

Constraining SN feedback: a tug of war between reionization and the Milky Way satellites