Speaker
Robert Koenig
Description
SNRs are believed to be a likely source of Galactic cosmic-ray protons with energies of PeV and above. High-energy protons, escaped from the shock front, diffuse in the ambient ISM and produce gamma rays as products of neutral pion decay from proton-proton interactions. Current models use a constant diffusion coefficient over the entire region to describe cosmic rays travelling through the ISM.
The diffusion coefficient depends on the magnetic field a proton traverses. I estimate the local magnetic field along the pathway of cosmic-ray protons using the gas densities of the ISM they pass through, obtaining a position-dependent diffusion coefficient with a non-symmetric proton distribution around the accelerator.
