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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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