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D.C. Ellison (North Carolina State University), A. Decourchelle (Service d'Astrophysique, C.E. Saclay, France)
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 3-10 times denser than test-particle predictions). We describe the nonlinear effects using a simple, self-consistent model of shock acceleration and calculate broad-band continuum emission from selected young SNRs. In a companion paper, we describe the corresponding effects on X-ray line emission.