Paper:	Starburst at the Molecular Superbubble in M 82
Volume:	320, The Neutral ISM in Starburst Galaxies
Page:	138
Authors:	Matsushita, S.; Kawabe, R.; Kohno, K.; Matsumoto, H.; Tsuru, T.; Vila-Vilaro, B.
Abstract:	We present high spatial resolution 100 GHz continuum emission observations with the Nobeyama Millimeter Array (NMA) toward an expanding molecular superbubble in the central region of M 82. The 100 GHz continuum image, which is dominated by free-free emission, revealed that the strongest peaks are concentrated at the inner edge of the superbubble. Star formation at these peaks is an order of magnitude more active in terms of ionizing flux than from the most massive star forming regions in our Galaxy. At this region, high velocity ionized gas, masers, and diffuse hard X-ray emission are also concentrated. These observations suggest that a strong starburst produced plasma and the superbubble expansion, and induced the present starburst regions. These results provide the first clear evidence of a self-propagating starburst in external galaxies.

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