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A WFC3 study of globular clusters in NGC 4150 - an early-type minor merger
Monthly Notices of the Royal Astronomical Society: Letters (2011)
  • Sugata Kaviraj
  • R. Mark Crockett
  • Bradley C. Whitmore
  • Joseph Silk
  • Robert W. O'Connell
  • Rogier A. Windhorst
  • Max Mutchler
  • Marina Rejkuba
  • Sukyoung Yi
  • Jay A. Frogel
  • Daniela Calzetti, University of Massachusetts - Amherst
We combine near-ultraviolet (NUV; 2250 {\AA}) and optical (U, B, V, I) imaging from the Wide Field Camera 3 (WFC3), on board the Hubble Space Telescope (HST), to study the globular cluster (GC) population in NGC 4150, a sub-L* (M_B ~ -18.48 mag) early-type minor-merger remnant in the Coma I cloud. We use broadband NUV-optical photometry from the WFC3 to estimate individual ages, metallicities, masses and line-of-sight extinctions [E_(B-V)] for 63 bright (M_V < -5 mag) GCs in this galaxy. In addition to a small GC population with ages greater than 10 Gyr, we find a dominant population of clusters with ages centred around 6 Gyr, consistent with the expected peak of stellar mass assembly in faint early-types residing in low-density environments. The old and intermediate-age GCs in NGC 4150 are metal-poor, with metallicities less than 0.1 ZSun, and reside in regions of low extinction (E_(B-V) < 0.05 mag). We also find a population of young, metal-rich (Z > 0.3 ZSun) clusters that have formed within the last Gyr and reside in relatively dusty (E_(B-V) > 0.3 mag) regions that are coincident with the part of the galaxy core that hosts significant recent star formation. Cluster disruption models (in which ~80-90% of objects younger than a few 10^8 yr dissolve every dex in time) suggest that the bulk of these young clusters are a transient population.
  • galaxies: star clusters,
  • galaxies: individual: NGC 4150,
  • galaxies: ellipti- cal and lenticular,
  • cD,
  • galaxies: evolution galaxies: interactions,
  • ultraviolet: galaxies
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Publisher Statement
This paper was harvested from and ArXiv identifier is arXiv:1107.5042
Citation Information
Sugata Kaviraj, R. Mark Crockett, Bradley C. Whitmore, Joseph Silk, et al.. "A WFC3 study of globular clusters in NGC 4150 - an early-type minor merger" Monthly Notices of the Royal Astronomical Society: Letters (2011)
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