Involved people at OAB: Cappi.
Cappi is involved in a project with researchers at the Observatoire de la
Côte d'Azur (Maurogordato, Slezak) and at the CEA/CEN in Saclay (M.Arnaud,
J--L. Sauvageot), aiming at a combined optical and X--ray study of galaxy and
gas dynamics in a selected sample of galaxy clusters. This project
is mainly based on optical observations at the ESO 3.6m
and CFHT telescopes, and on X-ray observations with ASCA and ROSAT, and
with Chandra (further observations with XMM are planned). The first results
(recently published) of this project concern A521, a complex, relatively
rich cluster at 
, in the middle of two filamentary structures,
with on--going merging (Maurogordato et al. 2000).
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