Results from the REFLEX Cluster Survey
  Based on the ROSAT All-Sky Survey we have conducted a large redshift survey as an ESO key programme to identify and secure redshifts for the X-ray brightest clusters found in the southern hemisphere. We present first results for a highly controlled sample for a flux limit of 3 10-12 erg/s/cm+2 comprising 475 clusters (87% with redshifts). The logN-logS function of the sample shows an almost perfect Euclidian slope and a preliminary X-ray luminosity function is presented. 
H. B\"ohringer (MPE, Garching), L. Guzzo (Osservatorio Merate), C.A.   Collins (University of Liverpool), D.M. Neumann (CEA,...