Abstract
At least 50 supernova remnants (the small bubbles) have been identified in the M 82 starburst and radio synthesis studies with sub-parsec linear resolution have been used to measure the distribution, luminosity, sizes and, in some cases, expansion velocities of these remnants. The remnants are used to estimate the supernova rate and hence an independent measure of the star-formation rate in the starburst.
On a larger scale we have recently discovered neutral hydrogen shells (the large bubbles) in absorption against the diffuse radio continuum from the starburst. The shells have radii between 30 and 60 pc and energies as high as 2×10^52 erg and most likely arise as consequence of wind-driven shells from regions of high star formation.
