CO emission from candidate photo-dissociation regions in M 81
Context: .At least a fraction of the atomic hydrogen in spiral galaxies is suspected to be the result of molecular hydrogen which has been dissociated by radiation from massive stars. Aims: .In this paper, we extend our earlier set of data from a small region of the Western spiral arm of M 81 with CO observations in order to study the interplay
Knapen, J. H. et al.
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9
2006