出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present a survey of 22 very X-ray luminous galaxy (Lx ¸ 0:5£1045 erg/sec in the 0.5-2keV
band) clusters selected from the ROSAT Bright Survey. Because of their tremendous X-ray luminosity
all clusters are assumed to be very massive systems. In addition, the medium redshift range
0:1 · z · 0:52 was chosen, hence the probability for these clusters to act as gravitational lenses
is very high. In these proceedings we present R- and V-band observations of the three clusters
RBS325, RBS653 and RBS864 and discuss their photometric properties.
