There's a Mysterious Barrier Keeping Cosmic Rays Out of The Galactic Center (sciencealert.com)
According to the team's calculations, the density of cosmic rays in the central molecular cloud is lower than the density of the cosmic ray sea. This suggests the presence of some kind of barrier that is preventing cosmic rays from penetrating the central molecular cloud.
Exactly what this barrier consists of will need to be the subject of future research, but there are several intriguing possibilities.
Molecular clouds are complicated places. The collapse of denser parts of the cloud can result in compression of magnetic fields; that could be a barrier. Another could be magnetohydrodynamic turbulence.
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