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Published online by Cambridge University Press: 25 May 2016
We are engaged in a radio–IR-optical–X-ray study of two flux-limited samples of ROSAT clusters of galaxies south of declination −20° (Pierre et al., 1994a). One sample covers an area of 1750 deg2 in Hydra (Pierre et al., 1994b) and includes some distant (z ≈ 0.3) and X-ray luminous (LX ≈ 1045 ergs–1) clusters. The other sample derives from a volume-limited subset (nominally z ≤ 0.1) of southern X-ray clusters, which are the focus of an ESO Key Program (Guzzo et al., 1995).