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Most bulge-dominated galaxies host black holes (BH) with masses that tightly correlate with the masses of their bulges. The quest to understand how, when, and where those BH formed motivates much of extragalactic astronomy. One population of galaxies with active BH in their nuclei (active galactic nuclei or AGN) that are fully or partially hidden by dust and gas, may hold the key with which to unlock this puzzle. Recent studies show that the luminosity functions of obscured and non-obscured AGNdoi:10.5281/zenodo.4433232 fatcat:ellwgtzmbvcezk4vgf57vvpome