Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.2604g&link_type=abstract
American Astronomical Society, AAS Meeting #211, #26.04; Bulletin of the American Astronomical Society, Vol. 39, p.777
Mathematics
Logic
Scientific paper
As a consequence of hierarchical galaxy formation, stellar halos should be at least partially composed of tidal debris from past accretion events. Detailed comparisons between observations of stellar halos and cosmological simulations of stellar halo formation can be used to help constrain models of galaxy formation. In order to increase the number of stellar halos which have been studied in detail, we have undertaken a large spectroscopic survey of red giant branch stars in the Andromeda galaxy with the DEIMOS spectrograph on the Keck II telescope, out to projected distances as large as 165 kpc from the center of the galaxy. I will discuss the main results of this survey, including the global characteristics of Andromeda's stellar halo and the discovery of several tidal debris features. The general properties of this debris will be compared to predictions from numerical simulations of stellar halo formation.
Beaton Rachael
Geha Marla
Gilbert Karoline
Guhathakurta Puraga
Johnston Karen
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