Optical and UV Diagnostics of Supernova Remnant Shocks

摘要: The relatively faint optical and UV emission from non-radiative shock waves provides diagnostics for processes related to cosmic ray acceleration in collisionless shocks. Emission line profiles intensities can be used determine the efficiencies of electron-ion ion-ion thermal equilibration, which influence population fast particles injected into process. It is found that T e/T P declines with speed i roughly proportional mass Important information about precursors may available, but interpretation still somewhat ambiguous. compression ratios shocks efficiently accelerate rays are predicted substantially larger than factor 4 expected a strong γ = 5/3 perfect gas, some limits available observations.