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Paper: A Study of the Sagittarius Tidal Stream Using Maximum Likelihood
Volume: 411, Astronomical Data Analysis Software and Systems XVIII
Page: 221
Authors: Cole, N.; Newberg, H.J.; Magdon-Ismail, M.; Desell, T.; Varela, C.; Szymanski, B.
Abstract: Modern surveys are producing enormous amounts of data that can only be navigated via the use of the ever increasing computational resources available. For example, the SDSS has taken a large amount of photometric data that can be used to discover and study substructure in the Galactic spheroid. A maximum likelihood method was developed and applied to color-selected F turnoff stars from two stripes of SDSS data, to determine the spatial characteristics of the Sagittarius dwarf tidal debris that exists within these stripes. The Sagittarius tidal debris in stripes 79 and 86 were detected at the positions (l, b,R) = (163.°311, -48.°400, 30.23 kpc) and (l, b,R) = (34.°775, -72.°342, 26.08 kpc) and were found to have a FWHM of 6.53±0.54 kpc and 5.71±0.26 kpc and also to contain ≈ 9,500 and ≈ 16,700 F turnoff stars, respectively. The debris pieces are axially aligned with the directions (X,Y,Z) = (0.758 kpc, 0.254 kpc, -0.600 kpc) and (X,Y,Z) = (0.982 kpc, 0.084 kpc, 0.167 kpc), respectively. The results of probabilistically separating the tidal debris from the stellar spheroid are also presented.
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