The outer halo globular cluster system of M31 - III. Relationship to the 
stellar halo

Mackey, A. D.; Ferguson, A. M. N.; Huxor, A. P.; Veljanoski, J.; Lewis, G. F.; McConnachie, A. W.; Martin, N. F.; Ibata, R. A.; Irwin, M. J.; Côté, P.; Collins, M. L. M.; Tanvir, N. R.; Bate, N. F.

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Journal Article

The outer halo globular cluster system of M31 - III. Relationship to the stellar halo

MPS-Authors

Mackey, A. D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ferguson, A. M. N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Huxor, A. P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Veljanoski, J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lewis, G. F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

McConnachie, A. W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martin, N. F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ibata, R. A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Irwin, M. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Côté, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Collins, M. L. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tanvir, N. R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bate, N. F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019MNRAS.484.1756M
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Citation

Mackey, A. D., Ferguson, A. M. N., Huxor, A. P., Veljanoski, J., Lewis, G. F., McConnachie, A. W., et al. (2019). The outer halo globular cluster system of M31 - III. Relationship to the stellar halo. Monthly Notices of the Royal Astronomical Society, 484, 1756-1789.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D082-C

Abstract

We utilize the final catalogue from the Pan-Andromeda Archaeological Survey to investigate the links between the globular cluster system and field halo in M31 at projected radii R_proj = 25-150 kpc. In this region the cluster radial density profile exhibits a power-law decline with index Γ = -2.37 ± 0.17, matching that for the stellar halo component with [Fe/H] < -1.1. Spatial density maps reveal a striking correspondence between the most luminous substructures in the metal-poor field halo and the positions of many globular clusters. By comparing the density of metal-poor halo stars local to each cluster with the azimuthal distribution at commensurate radius, we reject the possibility of no correlation between clusters and field overdensities at 99.95{{ per cent}} significance. We use our stellar density measurements and previous kinematic data to demonstrate that ≈ 35-60 per cent of clusters exhibit properties consistent with having been accreted into the outskirts of M31 at late times with their parent dwarfs. Conversely, at least {̃ }40{{ per cent}} of remote clusters show no evidence for a link with halo substructure. The radial density profile for this subgroup is featureless and closely mirrors that observed for the apparently smooth component of the metal-poor stellar halo. We speculate that these clusters are associated with the smooth halo; if so, their properties appear consistent with a scenario where the smooth halo was built up at early times via the destruction of primitive satellites. In this picture the entire M31 globular cluster system outside R_proj = 25 kpc comprises objects accumulated from external galaxies over a Hubble time of growth.