Galactic Cosmic Rays from Supernova Remnants: II Shock Acceleration of Gas and Dust

摘要

This is the second paper (the first was astro-ph/9704267) of a seriesanalysing the Galactic Cosmic Ray (GCR) composition and origin. In this wepresent a quantitative model of GCR origin and acceleration based on theacceleration of a mixture of interstellar and/or circumstellar gas and dust bysupernova remnant blast waves. We present results from a nonlinear shock modelwhich includes (i) the direct acceleration of interstellar gas-phase ions, (ii)a simplified model for the direct acceleration of weakly charged dust grains toenergies of order 100keV/amu simultaneously with the gas ions, (iii) frictionalenergy losses of the grains colliding with the gas, (iv) sputtering of ions ofrefractory elements from the accelerated grains and (v) the further shockacceleration of the sputtered ions to cosmic ray energies. The calculated GCRcomposition and spectra are in good agreement with observations.