Thousands of star clusters in M51 with HST/ACS

@inproceedings{Scheepmaker2008ThousandsOS,
  title={Thousands of star clusters in M51 with HST/ACS},
  author={Remco Scheepmaker and Mark Gieles and Marcel Richard Haas and Nate Bastian and S. Larsen and Hjglm Lamers},
  year={2008}
}
We study the entire star cluster population in the disk of M51 by using radius measurements, and we see evidence for a universal preferred radius for both young and old cluster populations and for an increased cluster formation rate at a galactocentric distance of ∼6 kpc, which is similar to the corotation radius. 
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ApJ
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