Superassociations as part of a fractal hierarchy

We show that the correlation between the size of the largest superassociati ons and the luminosity of the parent galaxy found by Elmegreen et al. is mo st likely due to the size-of-sample effect acting on a universal size distr ibution. We calculate this distribution function to be dN proportional to r (-4.2+/-0.6) dr, independent of the luminosity of the parent galaxy, and sh ow that this law is consistent with the hypothesis that superassociations a re part of a fractal hierarchy of structures that might extend from stellar -sized clouds all the way to full galaxies.