The Stellar Populations of Halo Substructure Along the Major Axis of Andromeda

Details The Stellar Populations of Halo Substructure Along the Major Axis of Andromeda The Stellar Populations of Halo Substructure Along the Major Axis of Andromeda

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..374..295r&link_type=abstract

From Stars to Galaxies: Building the Pieces to Build Up the Universe. ASP Conference Series, Vol. 374, proceedings of the confer

Computer Science

Scientific paper

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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