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The structure of star clusters in the outer halo of M31

In English

Författare

  • N. R. Tanvir
  • A. D. Mackey
  • A. M. N. Ferguson
  • A. Huxor
  • J. I. Read
  • G. F. Lewis
  • M. J. Irwin
  • S. Chapman
  • R. Ibata
  • M. I. Wilkinson
  • A. W. McConnachie
  • N. F. Martin
  • Melvyn B Davies
  • T. J. Bridges
Visa allt

Summary, in English

We present a structural analysis of halo star clusters in M31 based on deep Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) imaging. The clusters in our sample span a range in galactocentric projected distance from 13 to 100 kpc and thus reside in rather remote environments. Ten of the clusters are classical globulars, whilst four are from the Huxor et al. population of extended, old clusters. For most clusters, contamination by M31 halo stars is slight, and so the profiles can be mapped reliably to large radial distances from their centres. We find that the extended clusters are well fit by analytic King profiles with similar to 20 parsec core radii and similar to 100 parsec photometric tidal radii, or by Sersic profiles of index similar to 1 (i.e. approximately exponential). Most of the classical globulars also have large photometric tidal radii in the range 50-100 parsec; however, the King profile is a less good fit in some cases, particularly at small radii. We find 60 per cent of the classical globular clusters exhibit cuspy cores which are reasonably well described by Sersic profiles of index similar to 2-6. Our analysis also reinforces the finding that luminous classical globulars, with half-light radii <10 parsec, are present out to radii of at least 100 kpc in M31, which is in contrast to the situation in the Milky Way where such clusters (other than the unusual object NGC 2419) are absent beyond 40 kpc.

Publiceringsår

2012

Språk

Engelska

Sidor

162-184

Publikation/Tidskrift/Serie

Monthly Notices of the Royal Astronomical Society

Volym

422

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Oxford University Press

Ämne

  • Astronomy, Astrophysics and Cosmology

Nyckelord

  • galaxies: haloes
  • galaxies: star clusters: general
  • galaxies:
  • individual: M31

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1365-2966