Newly discovered globular clusters in NGC 147 and NGC 185 from PAndAS

J. Veljanoski*, A. M.N. Ferguson, A. P. Huxor, A. D. Mackey, C. K. Fishlock, M. J. Irwin, N. Tanvir, S. C. Chapman, R. A. Ibata, G. F. Lewis, A. McConnachie

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

17 Citations (Scopus)

Abstract

Using data from the Pan-Andromeda Archaeological Survey (PAndAS), we have discovered four new globular clusters (GCs) associated with the M31 dwarf elliptical (dE) satellites NGC 147 and NGC 185. Three of these are associated with NGC 147 and one with NGC 185. All lie beyond the main optical boundaries of the galaxies and are the most remote clusters yet known in these systems. Radial velocities derived from low-resolution spectra are used to argue that the GCs are bound to the dwarfs and are not part of the M31 halo population. Combining PAndAS with United Kingdom Infrared Telescope (UKIRT)/WFCAM (Wide- Field Camera) data, we present the first homogeneous optical and near-IR photometry for the entireGCsystems of these dEs. Colour-colour plots and published colour-metallicity relations are employed to constrain GC ages and metallicities. It is demonstrated that the clusters are in general metal poor ([Fe/H] < -1.25 dex), while the ages are more difficult to constrain. The mean (V - I)0 colours of the two GC systems are very similar to those of the GC systems of dEs in the Virgo and Fornax clusters, as well as the extended halo GC population in M31. The new clusters bring the GC-specific frequency (SN) to ̃9 in NGC 147 and ̃5 in NGC 185, consistent with values found for dEs of similar luminosity residing in a range of environments.

Original languageEnglish
Pages (from-to)3654-3666
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume435
Issue number4
DOIs
Publication statusPublished - 1 Nov 2013

Keywords

  • Galaxies
  • General - galaxies
  • Globular clusters
  • Individual
  • NGC 147-galaxies
  • NGC 185

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