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Astron. Astrophys. 319, 655-663 (1997) AcknowledgementsWe like to thank the entire ROSAT team and the Effelsberg telescope operateurs for excellent support. We also thank the referee, Dr. T. L. Landecker, for usefull comments, and Dr. L.A. Higgs for his agreement to install the DRAO plotting package at the MPIfR. All figures, except Figs. 7 and 9 are plotted with this package.
© European Southern Observatory (ESO) 1997 Online publication: July 3, 1998 ![]() |