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 × 10 41 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 = 2-4 M ☉ yr -1 .
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Zirakashvili et al. (2005) studied this question.
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