Young Massive Clusters in Non-Interacting Galaxies
  Young star clusters with masses well in excess of 100.000 Msun have been observed not only in merger galaxies and large-scale starbursts, but also in fairly normal, undisturbed spiral and irregular galaxies. Here we present virial mass estimates for a sample of 7 such clusters and show that the derived mass-to-light ratios are consistent with "normal" Kroupa-type stellar mass distributions. 
S. S. Larsen (1), J. P. Brodie (2), D. A. Hunter (3) and T. Richtler   (4) ((1) ESO/ST-ECF, (2) UCO/Lick, (3) Lowell Observa...