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キーワード:
acceleration of particles, cosmic rays galaxies: ISM galaxies: starburst
要旨:
We present an analytical model for the hydrodynamic outflow from the disk of a starburst galaxy. The model is used to calculate the cosmic-ray propagation and the radio intensity distribution in the nuclear starburst region of NGC 253. We find that the cosmic-ray energy production rate of the central 600 pc of NGC 253 is about 3 × 1041 ergs s-1, which is about 15% of the total mechanical supernova power. For this inner region, we estimate a terminal outflow velocity of 900 km s-1 and a mass-loss rate of M = 24 MΘ yr-1.
