2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/4878In the gaseous disk model, the density profile is derived from the mass and energy conservation in the gravitational field of a central energy source. Using the condition for emission, following from the induced character of radiation process, we obtain the wavelength dependence of radio source size which is consistent with observational data.4 pagesAstrophysicstext