Astron. Astrophys. 355, L47-L51 (2000)

Acknowledgements

We thank the TNG staff and C. Baffa for technical assistance during the observations. We are grateful to P. Giommi, G. Matt, S. Molendi and G.C. Perola, who are involved in the HELLAS project. This work was partially supported by the Italian Space Agency (ASI) through the grant ARS-99-75 and by the Italian Ministry for University and Research (MURST) through the grant Cofin-98-02-32.

© European Southern Observatory (ESO) 2000

Online publication: March 21, 2000
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