Shock Heating and Nonlinear Cosmic Ray Production in Young Supernova Remnants
Don Ellison
North Carolina State University, Raleigh, NC, USA

Cosmic ray production in young supernova remnant (SNR) shocks is expected to be efficient and strongly nonlinear. In nonlinear, first-order Fermi acceleration, compression ratios will be higher and the shocked temperature lower than test-particle, Rankine-Hugoniot relations predict (in extreme cases, the shocked gas can be simultaneously 10 times cooler and 10 times denser than test-particle predictions). Thus, efficient particle acceleration connects cosmic ray production with the properties of the shock heated interstellar medium and influences the dynamics of the remnants and modifies the X-ray line and continuum emission. We describe the nonlinear effects using a simple, self-consistent model of shock acceleration and calculate broad-band continuum emission from selected young SNRs.