Program: GN-2017A-Q-7

The coevolution of black holes (BH) and host galaxies provides an effective framework for understanding of formation and evolution of galaxies. Especially, dust-obscured galaxies (DOGs), harboring heavily obscured BHs, represent an important phase in galaxy evolution sequence with transitioning from obscured to unobscured AGN/quasars. A major problem for investigating DOGs, however, is that BH mass is hard to measure due to severe dust extinction, which renders broad emission lines non-detectable in UV/optical wavelength ranges. The rest-frame near-IR Paschen lines, which are much less affected by dust extinction, provide a practical means to overcome the limitation. Thus, we propose to obtain near-IR spectra containing Paschen emission lines with Gemini/GNIRS to directly measure their BH masses based on broad-line gas kinematics for a sample of 5 local DOGs, for which stellar masses can be derived with archival multi-band SED data. We will investigate local DOGs on the plane of the BH mass-galaxy stellar mass scaling relation by mapping out their evolution path, thereby improving our understanding of physical nature and evolutionary phase of these galaxies in the context of BH-galaxy coevolution.