Tracing the Sagittarius Tidal Stream with Maximum Likelihood

Details Tracing the Sagittarius Tidal Stream with Maximum Likelihood Tracing the Sagittarius Tidal Stream with Maximum Likelihood

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1082..216c&link_type=abstract

CLASSIFICATION AND DISCOVERY IN LARGE ASTRONOMICAL SURVEYS: Proceedings of the International Conference: ``Classification and Di

Astronomy and Astrophysics

Astronomy

Quasars, Active Or Peculiar Galaxies, Objects, And Systems, Stellar Clusters And Associations, Dwarf Galaxies

Scientific paper

Large scale surveys are providing vast amounts of data that can help us understand and study tidal debris more easily and accurately. A maximum likelihood method for determining the spatial properties of this tidal debris and the stellar Galactic spheroid has been developed to take advantage of these huge datasets. We present the results of studying the Sagittarius dwarf tidal stream in two SDSS stripes taken in the southern Galactic Cap using this method. This study was done using stars with the colors of blue F turnoff stars in SDSS. We detected Sagittarius debris at the positions (l,b,R) = (163.311°,-48.400°,30.23 kpc) and (l,b,R) = (34.775°,-72.342°,26.08 kpc). These debris pieces 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 were also found to have (spatial) directions of (X̂,Ŷ,Ẑ) = (0.758,0.254,-0.600) and (X̂,Ŷ,Ẑ) = (0.982,0.945,0.167), respectively. Using the results of the algorithm, we have also probabilistically separated the tidal debris from the stellar spheroid and present those results as well.

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