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Nature ${rb.getVolume()}, 641-643 (2 October 2008) | doi:10.1038/nature07266;
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Clustered star formation as a natural explanation for the H|[agr]| cut-off in disk galaxies
The rate of star formation in a galaxy is often determined by the observation of emission in the H|[agr]| line, which is related to the presence of short-lived massive stars. Disk galaxies show a strong cut-off in H|[agr]| radiation at a certain galactocentric distance, which has led to the conclusion that star formation is suppressed in the outer regions of disk galaxies.
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