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Paper: The Stellar Populations of Halo Substructure Along the Major Axis of Andromeda
Volume: 374, From Stars to Galaxies: Building the Pieces to Build Up the Universe
Page: 295
Authors: Richardson, J.C.; Ferguson, A.M.N.; Johnson, R.A.; Faria, D.C.
Abstract: We present HST/ACS observations of five regions in the outskirts of M31. Four are centered on prominent stellar overdensities roughly aligned with the major axis. Well-populated colour magnitude diagrams (CMDs) show that these fields differ in morphology from the fifth (Minor Axis) field. Comparisons with isochrones present tantalising evidence that they contain a small contingent of very young (less than one gigayear old) stars, at odds with what may be expected of typical halo populations, which suggests that this low-latitude substructure could feasibly have formed in the disk.
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