Speaker
Elena Orlando
(University of Trieste/Istituto Nazionale di Fisica Nucleare and Stanford University)
Description
The Galactic halo magnetic field strongly affects the propagation and deflection of high-energy cosmic rays, yet its strength is still uncertain. We constrain the ordered halo field through self-consistent modeling of cosmic-ray propagation and synchrotron polarization, comparing large-scale models with Planck 30 GHz data. Exploring different cosmic-ray halo sizes, we find a toroidal ordered field with a peak strength of 3.2–4.3 μG, with a 4 kpc propagation halo preferred. This is 4–6 times larger than estimates for the coherent halo field from rotation measures, indicating a significant ordered random component in the halo. These results provide an essential ingredient for realistic modeling of high-energy cosmic-ray deflections.
Author
Elena Orlando
(University of Trieste/Istituto Nazionale di Fisica Nucleare and Stanford University)