Theoretical Model for the Structure of the Gamma-ray Bubbles in Our Galaxy

A flux of nuclei emerging from the center of the Galaxy is assumed to reach a magnetic field “arch” with dimensions of the same order of magnitude as that of the Galaxy [1]. Then a lower hybrid mode is envisioned to be excited by the non-thermal features of the nuclei distribution [2]. This mode can then transfer energy, parallel to the magnetic field to high velocity electrons which can be held responsible for the observed high energy radiation emission at large distances from the center of the galaxy defining the edge of each bubble.

1. H.-Y. K. Yang, M. Ruszkowski, E.G. Zweibel, Galaxies 6 29 (2018).

2. T. Chang and B. Coppi, Geophys. Res. Lett. 8, 1253 (1981).