Observational evidence suggests that quasar activity plays an important role in regulating how
galaxies and their nuclear supermassive black holes grow and co-evolve, despite their
orders-of-magnitude difference in scale. In this talk, I will present a population of highly
luminous dust-reddened quasars that may be the key to understanding this co-evolution. Red
quasars are among the most intrinsically-luminous quasars in the Universe representing a
short-lived phase in the lifetime of a quasar, during which their energy output (feedback)
irrevocably impacts their host galaxy. Recent evidence has also shown that red quasars have
enhanced radio emission, possibly linking the formation of jets to the merger phenomenon or
exposing a different form of feedback in these systems, such as dusty radiation-driven winds.
Red quasars are thus ideal laboratories for addressing fundamental questions on the co-evolution
of black holes and their host galaxies as well as the physics of feedback. I will present
findings from several surveys that are uncovering this elusive population of quasars using
various selection methods across the electromagnetic spectrum to probe a broad range of redshift
and luminosity regimes.
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