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Astron. Astrophys. 323, 295-304 (1997) AcknowledgementsWe thank James Binney, Avishai Dekel, Jürgen Ehlers, Adi Nusser and David Weinberg for valuable comments and suggestions. TB is supported by the "Sonderforschungsbereich 375-95 für Astro-Teilchenphysik" der Deutschen Forschungsgemeinschaft. MPS is grateful to the Max-Planck-Institut für Astrophysik at Garching for its hospitality.
© European Southern Observatory (ESO) 1997 Online publication: June 5, 1998 ![]() |