HST / STIS RESULTS ON NUCLEAR STAR CLUSTERS IN SPIRAL GALAXIES

  • Joern Rossa
  • P. Roeland van der Mare
  • Torsten Böker
  • Joris Gerssen
  • C. Luis Ho
  • Hans-Walter Rix
  • C. Joseph Shields
  • Carl-Jakob Walcher
Part of the Astrophysics and Space Science Proceedings book series (ASSSP)

Abstract

Recent HST imaging surveys have revealed the presence of central star clusters in a majority of spiral galaxies. These nuclear clusters (NCs) may provide important clues to the central structure and secular evolution of disk galaxies. However, their origin and nature are not entirely understood. We therefore performed a spectroscopic survey with HST/STIS of NCs in 40 early- and late-type spiral galaxies. To study the ages and physical properties of the clusters we performed stellar population synthesis modeling using Bruzual-Charlot template spectra. The luminosity-weighted NC ages are almost always less than a Hubble time, indicating that star formation is an ongoing process in spiral galaxy centers. We find that NCs in late-type spirals are younger and less massive than those in early-type spirals.

Keywords

Dust 

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References

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Copyright information

© Springer 2007

Authors and Affiliations

  • Joern Rossa
    • 1
  • P. Roeland van der Mare
    • 1
  • Torsten Böker
    • 2
  • Joris Gerssen
    • 3
  • C. Luis Ho
    • 4
  • Hans-Walter Rix
    • 5
  • C. Joseph Shields
    • 6
  • Carl-Jakob Walcher
    • 5
  1. 1.Space Telescope Science InstituteBaltimoreUSA
  2. 2.Astrophysics DivisionESTECNoordwijkThe Netherlands
  3. 3.Department of PhysicsUniversity of DurhamUnited Kingdom
  4. 4.Observatories of the Carnegie Institution of WashingtonPasadenaUSA
  5. 5.Max-Planck-Institut fuer AstronomieHeidelbergGermany
  6. 6.Department of Physics and AstronomyClippinger Research Laboratories, Ohio UniversityAthensUSA

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