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“Dynamics of Galaxies and Globular Clusters Unraveled with Two-Dimensional Stellar Kinematics” Dr. Glenn van de Ven Institute for Advanced Study |
| Two-dimensional stellar kinematics obtained with the integral-field spectrograph SAURON allow the classification of early-type galaxies into 'slow' and 'fast' rotators, different from their morphological classification into ellipticals and lenticulars. Most fast rotators, including lenticular as well as many elliptical galaxies, are consistent with oblate axisymmetric disk-like systems. On the other hand, the slow-rotator ellipticals show clear deviations from axisymmetry, which can be modeled with our recent extension of Schwarzschild's orbit superposition method to triaxial geometry. Besides galaxies, I show that Schwarzschild's method is also well suited to model in detail globular clusters such as omega Cen and M15. The recovered internal orbital structure of omega Cen reveals besides a clear signature of strong tidal interaction, also a central stellar disk, supporting its origin as the nucleus of a stripped dwarf galaxy. The formally best-fit Schwarzschild model for M15 includes an intermediate-mass black hole (IMBH), but we cannot exclude a model in which dark remnants make up the dark mass in the collapsed core. |