Astron. Astrophys. 324, 32-40 (1997)

Acknowledgements

We wish to thank V. Cayatte for helpful discussions and acknowledge very constructive comments from the referee J. Lequeux. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, Caltech, under contract with the National Aeronautics and Space Administration. CX acknowledges that part of his work in this paper has been done in the framework of the Sonderforschungsbereich 328 (Entwicklung von Galaxien).

© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998

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