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The statistics of black holes and their masses strongly suggests that theirmass distribution has a cutoff towards lower masses near $3 \times 10^{6}$M$_{\odot}$. This is consistent with a classical formation mechanism from theagglomeration of the first massive stars in the universe. However, when themasses of the stars approach $10^{6}$ M$_{\odot}$, the stars become unstableand collapse, possibly forming the first generation of cosmological blackholes. Here we speculate that the claimed detection of an isotropic radiobackground may constitute evidence of the formation of these first supermassiveblack holes, since their data are compatible in spectrum and intensity withsynchrotron emission from the remnants. The model proposed fulfills allobservational conditions for the background, in terms of single-sourcestrength, number of sources, far-infrared and gamma-ray emission. The observedhigh energy neutrino flux is consistent with our calculations in flux andspectrum. The proposal described in this paper may also explain the earlyformation and growth of massive bulge-less disk galaxies as derived from themassive, gaseous shell formed during the explosion prior to the formation of asupermassive black hole.

Cosmic backgrounds due to the formation of the first generation of supermassive black holes