The Radio Synchrotron Background -- A Cosmic Conundrum
It has recently become apparent that the background level of diffuse radio emission on the sky is significantly higher than the level that can result from known extragalactic radio source classes or our Galaxy given our current understanding of its large-scale structure.~ In contrast to the more well-known and well-constrained cosmological and astrophysical backgrounds at microwave, infrared, optical/UV, X-ray, and gamma-ray wavelengths, this ``radio synchrotron background'' at radio wavelengths provides clear motivation for considering the possibilities of new astrophysical sources and new particle-based emission mechanisms.
Copyright © 2020 The Author.
(to appear in “Particle Physics at the Year of the 150th Anniversary of Mendeleev’s Periodic Table of Chemical Elements,” A. Studenikin, Ed.) Proceedings of the 19th Lomonosov Conference on Elementary Particle Physics.
Singal, Jack. “The Radio Synchrotron Background: A Cosmic Conundrum.” Edited by Alexander Studenikin. Proceedings of the 19th Lomonosov Conference on Elementary Particle Physics Online First (2020). http://arxiv.org/abs/1911.12881