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Eric Andersson. Profile Picture

Eric Andersson

Doctoral student

Eric Andersson. Profile Picture

Tidal stripping as a mechanism for placing globular clusters on wide orbits : The case of MGC1 in M31

Author

  • Eric P. Andersson
  • Melvyn B. Davies

Summary, in English

The globular clusters of large spiral galaxies can be divided into two populations: one that formed in situ and one that comprises clusters tidally stripped away from other galaxies. In this paper, we investigate the contribution to the outer globular cluster population in the M31 galaxy through donation of clusters from dwarf galaxies. We test this numerically by comparing the contribution of globular clusters from simulated encounters to the observed M31 globular cluster population. To constrain our simulations, we specifically investigate the outermost globular cluster in the M31 system, MGC1. The remote location of MGC1 favours the idea of it being captured; however, the cluster is devoid of features associated with tidal interactions. Hence, we separate simulations where tidal features are present and where they are hidden. We find that our simulated encounters can place clusters on MGC1-like orbits. In addition, we find that tidal stripping of clusters from dwarf galaxies leaves them on orbits having a range of separations, broadly matching those observed in M31. We find that the specific energies of globular clusters captured by M31 closely match those of the incoming host dwarf galaxies. Furthermore, in our simulations we find an equal number of accreted clusters on co-rotating and counter-rotating orbits within M31 and use this to infer the fraction of clusters that has been accreted. We find that even close in roughly 50 per cent of the clusters are accreted, while this figure increases to over 80 per cent further out.

Department/s

  • Lund Observatory
  • eSSENCE: The e-Science Collaboration

Publishing year

2019-02-28

Language

English

Pages

4134-4149

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

485

Issue

3

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Galaxies: individual: M31
  • Galaxies: star clusters: general

Status

Published

ISBN/ISSN/Other

  • ISSN: 0035-8711