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Supermassive black holes that are rapidly accreting matter (and sometimes outshining their host galaxies) were the first sources discovered at cosmological redshifts. Despite progress in the intervening half-century, key questions remain about how black holes affect the evolution of their host galaxies, as well as how they self-regulate their own growth. I will discuss so-called "AGN feedback," which is a topic of intense theoretical and observational interest. I will focus in particular on what we are learning from multiwavelength observational studies of the nearest and brightest active galactic nuclei. |
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