Astron. Astrophys. 336, 855-877 (1998)

Acknowledgements

AMR acknowledges the grateful receipt of a Royal Society fellowship during this work. We are also very grateful to Andreas Vogler for his X-ray-optical overlay routines and to Trevor Ponman for useful discussions. This research has made use of the SIMBAD database operated at CDS, Strasbourg.

Optical images are based on photographic data obtained with the UK Schmidt Telescope, operated by the Royal Observatory Edinburgh, and funded by the UK Science and Engineering Research Council, until June 1988, and thereafter by the Anglo-Australian Observatory. Original plate material is copyright (c) the Royal Observatory Edinburgh and the Anglo-Australian Observatory. The plates were processed into the present compressed digital form with their permission. The Digitized Sky Survey was produced at the Space Telescope Science Institute under US Government grant NAG W-2166.

Finally, we thank our colleagues from the MPE ROSAT group for their support. The ROSAT project is supported by the German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF/DARA) and the Max-Planck-Gesellschaft (MPG).

© European Southern Observatory (ESO) 1998

Online publication: July 27, 1998
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