The Effect of Orientation in Cross Sectional Studies

Details The Effect of Orientation in Cross Sectional Studies The Effect of Orientation in Cross Sectional Studies

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541321v&link_type=abstract

American Astronomical Society, AAS Meeting #215, #413.21; Bulletin of the American Astronomical Society, Vol. 42, p.253

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Recent studies of the Milky Way halo have shown that there are many tidal debris streams and other substructures that can be detected from the spatial distributions of halo stars. We are attempting to describe the spatial structure through maximum likelihood fitting of a smoothly varying component plus a set of additional components that describe the tidal debris. The Sagittarius tidal debris stream in particular is modeled by a set of piecewise linear cylinders with a density that falls of as a Gaussian from the central axis of the cylinder. We show the highest likelihood fit to the density of SDSS F turnoff stars along the Sagittarius stream, and the results of a test of the sensitivity of the likelihood fits to the angle between the stream direction and the angle at which the data is sliced into pieces.
This research was funded by NSF REU supplements to AST 06-07618, SEI(AST) 06-12213, and the NASA/NY Space Grant.

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