Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21113001b&link_type=abstract
American Astronomical Society, AAS Meeting #211, #130.01; Bulletin of the American Astronomical Society, Vol. 39, p.958
Other
Scientific paper
As the other giant galaxy in the Local Group, Andromeda offers an invaluable laboratory for understanding the formation and evolution of spiral galaxies. Using the Advanced Camera for Surveys on the Hubble Space Telescope, we have obtained extremely deep images of Andromeda, reaching well below the turnoff of the stellar main sequence. To date, these data allow a complete reconstruction of the star formation histories in the inner spheroid, outer disk, and tidal stream. Unlike the halo of the Milky Way, the spheroid of Andromeda shows an extended star formation history, with a significant population of metal-rich stars at ages of 6 to 11 Gyr in addition to an older metal-poor population. Despite its distinct kinematics and spatial morphology, the distribution of age and metallicity in the stream population is strikingly similar to that in the spheroid, implying that the inner spheroid of Andromeda is largely polluted by material stripped from the stream's progenitor or objects like it. The outer disk population is considerably younger and more metal-rich than the populations in the stream and spheroid, but the bulk of the stars are at ages of 4-8 Gyr, resembling the thick disk population of the solar neighborhood. I will review these results and their implications for spiral galaxy formation, and then conclude with a first look at new data we have have obtained in fields further out in the Andromeda spheroid.
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