Talk Title: Accreting super-massive black holes in high-redshift SCUBA galaxies
Abstract: Deep SCUBA surveys have uncovered a large population of ultra-luminous galaxies at z>1. These sources are often assumed to be starburst galaxies, but there is growing evidence that a substantial fraction host an AGN (i.e., an accreting super-massive black hole). I will present the strongest evidence for this viewpoint to date: the combination of ultra-deep X-ray observations and deep optical spectroscopic data. I will address the question "What powers bright SCUBA galaxies?" and show that a non-negligble fraction of SCUBA galaxies show evidence for binary AGN activity (presumably the early stages of black hole coalesence).
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