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We present results from infrared spectroscopic projects that aim to test therelation between the mass of a black hole, M_BH, and the velocity dispersion ofthe stars in its host-galaxy bulge. We demonstrate that near-infrared,high-resolution spectroscopy assisted by adaptive optics is key in populatingthe high-luminosity end of the relation. We show that the velocity dispersionsof mid-infrared, high-ionization lines originating from gas in the narrow-lineregion of the active galactic nucleus follow the same relation. This resultprovides a way of inferring M_BH estimates for the cosmologically significantpopulation of obscured, type-2 AGN that can be applicable to data fromspectrographs on the next generation infrared telescopes.

On the black hole mass - velocity dispersion relation for type-1 and type-2 AGN