Self-consistent Radiative Effects on Particle Acceleration via Relativistic Electromagnetic Outflows

Plasma outflows from gamma-ray bursts (GRB), pulsar winds, and relativistic jets radiate high energy emission. However, the radiation damping effect is ignored in conventional simulations. In this letter, we study the radiation damping effect on particle acceleration via Poynting fluxes in two-andhalf-dimensional particle-in-cell (PIC) plasma simulation with magnetized electron-positron plasmas. Radiation damping force is self-consistently calculated for each particle, and the accumlated effect from radiation reduces the acceleration force and converts particle energy to radiation. The emitted radiation is peaked within a few degrees from the direction of the Poynting flux and strongly linearly polarized, which may be detectable in GRB observations. Subject headings: gamma rays:bursts—MHD—methods:numerical—relativity