A Search for Kinematic Evidence of Tidal Tails in Globular Clusters

Physics

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Scientific paper

Recent star count surveys of areas around globular star clusters have shown strong evidence of tidal tails stretching out many degrees from the cluster itself. These tails are believed to be cluster stars which have escaped due to tidal shocking after passages through the disk of the Galaxy. The spatial and kinematic distribution of the tails can be used to set constraints on the potential of the Galaxy. To date, there is virtually no kinematic verification of any statistically identified tails. We are using the Sloan Digital Sky Survey (SDSS), Data Release-1 (DR1), to search for kinematic evidence of tidal tails in thirteen globular clusters near the DR1 strips. Using stars with spectroscopy from DR1, we have determined radial velocities, distances and metal abundance for the SDSS stars. We then search for stars which most closely match the parameters of the given globular cluster. We will present preliminary findings for this project, and discuss refinements and future follow-up observations.

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