Diffusive shock acceleration and the resulting non-thermal emission from colliding-wind binary systems

J. M. Pittard, G. S. Vila, G. E. Romero

Published 2019-12-11Version 1

We present a new model for the non-thermal emission from a colliding-wind binary. Relativistic protons and electrons are assumed to be accelerated through diffusive shock acceleration at the global shocks bounding the wind-wind collision region. The non-thermal particles that flow downstream from the shocks are subject to various cooling processes. We carefully resolve this cooling and calculate the anisotropic inverse Compton and relativistic bremsstrahlung emission from electrons, and the $\pi^{0}$-decay emission from the collision of non-thermal and thermal protons. We explore how the non-thermal emission changes with the stellar separation and the viewing angle of the system, and with the momentum ratio of the winds. In future work we will apply our model to real systems.