Universal Peaks Ratio In The Spectral Energy Density Of Double Hump Blazars, Gamma Ray Bursts, And Microquasars

The peak frequencies of the two broad humps evident in the spectral energy density of blazars are time dependent and vary a lot between different blazars. However, their ratio in most blazars, appears to be almost universal and equal to m_e c^2/2(1+z)epsilon_p to a good approximation, where m_e is the electron mass, epsilon_p is the peak energy of the cosmic microwave background radiation, and z is the redshift of the blazar. We discuss a possible origin of such a universal ratio in blazars, gamma ray bursts, and perhaps also in microquasars.