The relation between the mass of supermassive black holes located in the center of the host galaxies and the kinetic energy of random motions of the corresponding bulges can be reinterpreted as an age-temperature diagram for galaxies. This relation fits the experimental data better than the M •- M G, M •- L G, and M •- σ laws. The validity of this statement has been confirmed by using three samples extracted from different catalogues of galaxies. In the framework of the ΛCDM cosmology our relation has been compared with the predictions of two galaxy formation models based on the Millennium Simulation.
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