Galaxies: - observational and theoretical studies of the nuclear properties. Cusp slopes of spirals, dwarfs, and ellipticals. Origin of nuclei in galaxies. The role of massive black holes.
- observational and theoretical studies of galaxy formation and evolution. Differentiation between spirals and ellipticals, origin of the global properties of galaxies, the fundamental plane of elliptical galaxies and its evolution with redshift.
Globular Clusters: dynamical effects on the properties of globular clusters and globular cluster systems.
M 87 : the jet and counterjet in M87. Synchrotron models.
NGST : scientific requirements, study of instrument concepts.