The Kinematic Signature of the Northern Tidal Arm of the Sagittarius Dwarf Galaxy

Details The Kinematic Signature of the Northern Tidal Arm of the Sagittarius Dwarf Galaxy The Kinematic Signature of the Northern Tidal Arm of the Sagittarius Dwarf Galaxy

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..tsf.b3002w&link_type=abstract

American Physical Society, Texas Section Fall, October 23-25, 2003, Texas Tech Campus, Lubbock Texas, MEETING ID: TSF03, abstrac

Physics

Scientific paper

Recent results from the Sloan Digitized Sky Survey (SDSS) and the 2MASS All-Sky Survey have revealed clearly the extent of the spatial distribution of stars affiliated with the tidal debris tail of the Sagittarius Dwarf Galaxy (Sgr). Although these surveys help to shed light on the shape of the Sgr orbit, kinematics of the tidal tail stars are crucial in order to fully characterize the structure and dynamics of this component of our Galactic halo. Ultimately a full characterization of the orbit will allow a much better determination of the shape and extent of the Milky Way dark matter halo. I will be presenting kinematic results determined using SDSS Data-Release One spectroscopic data. This sample is in the direction of the Northern Arm which includes the point of apogalacticon at 45 kiloparsecs. Horizontal branch stars discovered at this distance show a population with a velocity dispersion (σ = 67 km/s) which is much smaller than the general halo population and indicative of streaming motion. The main-sequence, A-star population, also exhibits kinematics that are consistent with the predicted velocity dispersion at a distance of D ˜ 20 kpc. I will also present chemical abundance results for this population and compare to the various populations within Sgr.

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