Synthetic Maps of Synchrotron Emission in Massive Binary Systems from MHD Numerical Simulations

Massive binary systems are known to be sources of thermal and non-thermal radio emissions, as well as gamma-rays. Several objects, such as WR 146 and WR 147, have been observed for years with spatial resolution revealing that most of this emission has its origin in the wind-wind shock region. In the past decade, theoretical works attempted to clarify the basic processes of the origin of non-thermal emission in these objects, though very simplified, usually hydrodynamic models that apply ad hoc assumptions of the evolution of the magnetic field within the shocks. In this work we present the first full MHD numerical simulations of the wind-wind shock region of a massive binary system. We compute self-consistently the free-free and synchrotron emissivities, as well as the radiative transfer along any line of sight. We show that the synchrotron emission may be the dominant source of radio emission in the range of 1-10 GHz for most of the systems known.