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We examine the level of substructure and mass segregation in the massive,young cluster Westerlund 1. We find that it is relatively smooth, with littleor no mass segregation, but with the massive stars in regions of significantlyhigher than average surface density. While an expanding or bouncing-backscenario for the evolution of Westerlund 1 cannot be ruled out, we argue thatthe most natural model to explain these observations is one in which Westerlund1 formed with no primordial mass segregation and at a similar or larger sizethan we now observe.

Hierarchical formation of Westerlund 1: a collapsing cluster with no primordial mass segregation?