Richardson, J C; Ferguson, A. M. N.; Mackey, Alasdair; Irwin, M. J.; Chapman, S. C.; Huxor, A; Ibata, Rodrigo A; Lewis, Geraint Francis; Tanvir, Nial R
We present a high precision photometric view of the stellar populations in the outer halo of M31, using data taken with the Hubble Space Telescope/Advanced Camera for Surveys. We analyse the field populations adjacent to 11 luminous globular clusters which sample the galactocentric radial range 18 ≲ R ≲ 100 kpc and reach a photometric depth of ∼2.5 mag below the horizontal branch (m F814W ∼ 27 mag). The colour-magnitude diagrams are well populated out to ∼60 kpc and exhibit relatively...[Show more]
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