IAU Symposium Abstract S186-012P

Constraints on Interactions and Mergers from DSph Galaxies and Globular Clusters

Eva K. Grebel
Astronomy Dept., Univ. of Wurzburg, Am Hubland, D-97074 Wurzburg, Germany, grebel@astro.uni-wuerzburg.de

The suitability of dSph galaxies and globular clusters as tracers of interactions and mergers is investigated. Constraints on past interactions are discussed based on the stellar populations in dSph galaxies. Common and distinguishing properties of dSphs and globular clusters are analyzed with respect to the suggested great circles of merger remnants. The proposed Magellanic stream and the Fornax-Leo-Sculptor stream are found to be difficult to reconcile with the observed star formation histories and the few known space motions of dSphs and globular clusters. Correlations of globular cluster ages, metallicities, and horizontal branch morphologies with dynamical properties such as sense of rotation, angular momentum, and apogalactic distance are investigated. Implications for the formation of the Galactic halo are discussed.