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Astron. Astrophys. 347, 424-433 (1999) AcknowledgementsWe are grateful to A. Comastri and G. Zamorani for a careful reading of the manuscript, and to T. Miyaji, G. Hasinger and M. Schmidt for permission to use their LDDE model in advance of publication. Our presentation was greatly improved by the comments of the referee, Prof. G. Hasinger. This work was partly supported by the Italian Space Agency (ASI) under grant ARS-98-116/22 and by the Italian Ministry for University and Research (MURST) under grant Cofin98-02-32.
© European Southern Observatory (ESO) 1999 Online publication: June 30, 1999 ![]() |