Abstract

The last tidal encounter between M82 and M81 about 500 Myr ago had a major impact on what was probably an otherwise normal, quiescent, disk galaxy. It caused a concentrated burst of star formation activity, as evidenced by the peak in the age distribution of the cluster sample in M82’s fossil starburst region ‘B’ (de Grijs et al. 2001; cf. Figure 1), which decreased rapidly within a few hundred Myr.

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