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

Abstract

The statistics of black holes and their masses strongly suggests that their\nmass distribution has a cutoff towards lower masses near $3 \\times 10^{6}$\nM$_{\\odot}$. This is consistent with a classical formation mechanism from the\nagglomeration of the first massive stars in the universe. However, when the\nmasses of the stars approach $10^{6}$ M$_{\\odot}$, the stars become unstable\nand collapse, possibly forming the first generation of cosmological black\nholes. Here we speculate that the claimed detection of an isotropic radio\nbackground may constitute evidence of the formation of these first supermassive\nblack holes, since their data are compatible in spectrum and intensity with\nsynchrotron emission from the remnants. The model proposed fulfills all\nobservational conditions for the background, in terms of single-source\nstrength, number of sources, far-infrared and gamma-ray emission. The observed\nhigh energy neutrino flux is consistent with our calculations in flux and\nspectrum. The proposal described in this paper may also explain the early\nformation and growth of massive bulge-less disk galaxies as derived from the\nmassive, gaseous shell formed during the explosion prior to the formation of a\nsupermassive black hole.\n