Emission Spectra of Galaxies with Supermassive Black Holes at z > 6

The masses of supermassive black holes and the (parent) galaxies containing them are related approximately by M_BH ~ 0.002 M_*. This indicates their close interaction during the process of their joint evolution. However, the large spread in the observed masses around this relation and, in particular, the considerably larger value, by an order of magnitude, of this mass ratio in the early universe (z > 6) observed in recent years indicates that the character of their interaction may vary significantly as they evolve. This circumstance requires a reliable observational determination of the ratios of the masses of the black holes, stellar populations, and interstellar gas in galaxies at large redshifts when these cannot be measured directly. In this paper a simple description illustrating this possibility is proposed. The features of the spectra of galaxies containing growing black holes and a forming stellar population are examined. A set of models with variations in the masses of the black hole, stellar population, and interstellar gas is used to illustrate the feasibility of finding the ratio of their masses using multiwavelength spectra: far infrared, submillimeter, and X-ray.