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What evidence indicates the existence of recent star formation? 

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Consistency is found with substantial recent or ongoing star-formation activity.
This finding, combined with the overall wealth of dust and gas, could imply that star formation is still active.
We conclude that star formation seems to have occurred in likely several bursts rather than occurring coevally.
This seems to give further evidence for the hypothesis that the stars once formed in different subsystems, with different star-formation rates.
We suggest that the phenomena revealed here support a scenario of hierarchical star formation.
The star formation properties, calculated from typical merger star formation histories, demonstrate the impact of different assumptions about the star formation history.
Our model predictions qualitatively match some of the puzzling features in the observed star formation history.

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