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Submillimeter-emitting galaxies (SMGs) are z~2 bolometrically luminoussystems hosting energetic starburst and AGN activity. SMGs may represent arapid growth phase that every massive galaxy undergoes before lying on thewell-established black-hole-spheroid mass relationship in the local Universe.Here we briefly discuss our recent results from Alexander et al. (2008) wherewe estimated the masses of the black holes in SMGs using the black-hole virialmass estimator, finding M_BH~6x10^7 M_solar for typical SMGs. We show that theblack-hole-spheroid mass ratio for SMGs at z~2 was suggestively below thatfound for massive galaxies in the local Universe and more than an order ofmagnitude below the black-hole-spheroid mass ratio estimated for z~2 quasarsand radio galaxies. We demonstrate that SMGs and their progeny cannot lie onthe elevated z~2 black-hole-spheroid mass relationship of quasars-radiogalaxies without overproducing the space density of the most massive blackholes (M_BH~10^9 M_solar), unless the galaxy spheroid of SMGs is an order ofmagnitude lower than that typically assumed (M_SPH~10^10 M_solar). We also showthat the relative black-hole-spheroid growth rates of typical SMGs appear to beinsufficient to significantly increase the black-hole-spheroid mass ratio,without requiring long duty cycles (~10^9 years), and argue that a moreAGN-dominated phase (e.g., an optically bright quasar) is required tosignificantly move SMGs (and their progeny) up the black-hole-spheroid massplane.

Where do z~2 Submillimeter-Emitting Galaxies Lie On the Black-Hole-Spheroid Mass Plane?