Are Young Globular Clusters Forming in Quiescent Spiral Galaxies?

Details Are Young Globular Clusters Forming in Quiescent Spiral Galaxies? Are Young Globular Clusters Forming in Quiescent Spiral Galaxies?

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9192c&link_type=abstract

HST Proposal ID #9192

Physics

Hst Proposal Id #9192 Stellar Populations

Scientific paper

Systems of globular clusters {GC} in nearby ellipticals and spirals, and systems of young GCs in starburst and merging galaxies have been the subject of intensive study in recent years, because they provide important clues to galaxy formation and evolution. However, because young massive clusters {YMC} are rare in the Milky Way, these have not been studied in quiescent spirals until very recently. The ground based work of Larsen & Richtler {1999} suggests that we need to revise our understanding of the conditions necessary for the formation of massive, compact young clusters. We propose to use archival HST WFPC2 observations of 11 nearby, non- interacting late type galaxies, covering a range of Hubble types to: { i.} determine whether YMC have physical and structural properties similar to ancient globulars; { ii.} differentiate between cluster systems which formed in a burst, and those which formed continuously, { iii.} determine whether YMC systems are preferentially formed in later-type spirals; { iv.} look for differences in structural parameters of clusters in rich vs. poor systems, which constrain cluster formation mechanisms. Further, these data will allow us to find more intermediate mass {so-called ``populous''} clusters, which have not been studied in galaxies beyond the Local Group. If these are found in large numbers, this may represent a relatively common {albeit quiescent} mode of cluster formation.

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