Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20713505b&link_type=abstract
American Astronomical Society Meeting 207, #135.05; Bulletin of the American Astronomical Society, Vol. 37, p.1387
Other
Scientific paper
Using the Advanced Camera for Surveys on the Hubble Space Telescope, Andromeda has now been imaged well below the main sequence turnoff in three structures: the spheroid, the outer disk, and the tidal stream. These data allow a complete reconstruction of the star formation histories in these structures. Although the disk is significantly different from the other two fields, the stream and spheroid look remarkably similar. Each of the fields has an extended star formation history that was largely finished approximately 5 Gyr ago. At the same time, other observing programs are providing important constraints on the spatial morphologies and kinematics of these structures. Taken together, the extant data suggest a violent history in Andromeda, with significant disruption of the disk population into the outskirts of the galaxy.
Brown Ted M.
Ferguson Henry C.
Guhathakurta Puraga
Kimble Randy A.
Renzini Alvio
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