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Hierarchical structures and size distribution of star formation regions inthe nearby spiral galaxy NGC 628 are studied over a range of scale from 50 to1000 pc using optical images obtained with 1.5 m telescope of the MaidanakObservatory. We found hierarchically structured concentrations of starformation regions in the galaxy, smaller regions with a higher surfacebrightness are located inside larger complexes having a lower surfacebrightness. We illustrate this hierarchy by dendrogram, or structure tree ofthe detected star formation regions, which demonstrates that most of theseregions are combined into larger structures over several levels. We found threecharacteristic sizes of young star groups: 65 pc (OB associations), 240 pc(stellar aggregates) and 600 pc (star complexes). The cumulative sizedistribution function of star formation regions is found to be a power law witha slope of approximately -1.5 on scales appropriate to diameters ofassociations, aggregates and complexes. This slope is close to the slope whichwas found earlier by B. Elmegreen et al. for star formation regions in thegalaxy on scales from 2 to 100 pc.

Hierarchy and size distribution function of star formation regions in the spiral galaxy NGC 628