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Wiley InterScience | |||
  Monthly Notices of the Royal Astronomical Society: LettersSee Also: Volume 395 Issue 1, Pages L34 - L38 Published Online: 3 Mar 2009 Journal compilation © 2010 RAS A Journal of the Royal Astronomical Society
Abstract | References | Full Text: HTML, PDF (Size: 539K) | Related Articles | Citation Tracking  The outer halo globular clusters of M31
Copyright Journal compilation © 2009 RAS KEYWORDS globular clusters: general • galaxies: individual: M31 • galaxies: star clusters ABSTRACTWe present Keck/HIRES spectra of three globular clusters in the outer halo of M31, at projected distances beyond ≈80 kpc from M31. The measured recession velocities for all three globular clusters confirm their association with the globular cluster system of M31. We find evidence for a declining velocity dispersion with radius for the globular cluster system. Their measured internal velocity dispersions, derived virial masses and mass-to-light ratios are consistent with those for the bulk of the M31 globular cluster system. We derive old ages and metallicities which indicate that all three belong to the metal-poor halo globular cluster subpopulation. We find indications that the radial gradient of the mean metallicity of the globular cluster system interior to 50 kpc flattens in the outer regions, however it is still more metal-poor than the corresponding field stars at the same (projected) radius. Accepted 2009 February 3. Received 2009 February 2; in original form 2008 December 25 | 
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