AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 12. Extra Galactic Star Clusters: From Ancient Globulars to Young Star Clusters
Display, Monday, May 31, 1999, 9:20am-6:30pm, Southwest Exhibit Hall

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[12.02] Measuring Tidal Radii and Concentrations of Globular Clusters in M87

Q.C. Zhang, S. Zepf (Yale Univ.)

The measurements of structural and orbital parameters of globular clusters in elliptical galaxies provides important clues to the study of dynamical evolution of globular clusters and the mass distribution of host galaxies.The tidal radii and concentrations of 86 bright globular cluster candidates (V>22.64) in the central region of M87 are presented. The measurements were done by using the King model-fitting technique to the archived data obtained with WFC2 on HST. The best fitting concentrations range from 0.6 to 3.0, similar to that of Galactic GCs, while the measured tidal radii are significantly smaller, with Rt ~50 pc, than Rt ~100 pc of the GCs in the Milky Way.

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