Astron. Astrophys. 334, 87-95 (1998)

Acknowledgements

We should thank Dr. W. Duschl and Prof. O. Gerhard very much for reading our manuscript carefully and giving us a lot of helpful comments. We also should thank Dr. H. Falcke and Dr. L. Wisotzki for many interesting discussions. YPW would like to thank all the collegues in the group, C. Zier, T. Enßlin and H. Seemann for their friendly help during YPW's stay in MPIFR. PLB would like to thank Dr. John Magorrian at Toronto for intense discussions of these issues. We also wish to thank the referee for helpful comments that helped to improve the clarity of our arguments. YPW was first supported by a fellowship of the MPG, and then by the University of Wuppertal; both sources of funding are gratefully acknowledged.

© European Southern Observatory (ESO) 1998

Online publication: May 12, 1998

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