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Unleashing Feedback in Galaxy Formation

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I will review our understanding of feedback in galaxies. I will briefly discuss disk galaxies, and then focus on massive spheroids, where one invariably finds evidence for the presence of supermassive black holes. These are often visible, especially at early epochs, as active galactic nuclei. Negative feedback, from the central black hole during its accretion phase, is believed to quench the gas supply to the spheroid and thereby suppresses star formation. We also observe enhanced star formation at early epochs. This may provide evidence for positive AGN feedback. I will review the various theoretical and observational implications of the AGN -star formation connection.

This talk is part of the Cosmology Lunch series.

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