Mapping the Sagittarius Dwarf Tidal Streams with Maximum Likelihood

Details Mapping the Sagittarius Dwarf Tidal Streams with Maximum Likelihood Mapping the Sagittarius Dwarf Tidal Streams with Maximum Likelihood

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342510c&link_type=abstract

American Astronomical Society, AAS Meeting #213, #425.10; Bulletin of the American Astronomical Society, Vol. 41, p.253

Astronomy and Astrophysics

Astronomy

Scientific paper

We present spatial properties of the Sagittarius dwarf tidal stream at a number of points across the sky. Using a proven maximum likelihood method for characterizing the properties of tidal debris, we calculate the spatial best-fit parameters of tidal debris, as well as the Galactic stellar spheroid, within a number of small (2.5 degree wide stripes) volumes. Using stars from SDSS DR6 having the colors of blue F turnoff stars with reddening corrected color values 0.1 < (g-r) < 0.3, we are able to determine the position, orientation, size, and number of stars within the tidal debris for each volume, and compare to the number of similar stars in the Sgr core. Utilizing a probabilistic separation technique, we are able to extract the Sgr tidal debris from the stellar spheroid. This extraction allows for the separate study of both the debris and remaining spheroid stars. The separation also facilitates the study of the Galactic potential, and ultimately the dark matter halo, as the Sgr stream provides a good means of constraining models used in N-body simulations of tidal disruption. This research is supported by the National Science Foundation under grant SEI(AST) 06-12213, with additional support from NASA New York Space Grant and John A. Huberty.

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