High-energy neutrinos from Galactic superbubbles

K. J. Andersen, M. Kachelriess, D. V. Semikoz

Published 2017-12-08Version 1

We study the propagation of cosmic rays generated by sources residing inside superbubbles. We show that the enhanced magnetic field in the bubble wall leads to an increase of the interior cosmic ray density. Because of the large matter density in the wall, the probability for cosmic ray interactions on gas peaks there. As a result, the walls of superbubbles located near young cosmic ray sources emit efficiently neutrinos. We apply this scenario to the Loop I and Local Superbubble and suggest that cosmic rays from a young source, such as Vela, interacting in the bubble wall generate a substantial fraction of the observed astrophysical high-energy neutrino flux below $\sim 100$ TeV.