  From ROSAT data, the bright X-ray cluster Abell 85 was found to show a
roughly symmetrical shape, on to which are superimposed several features, among
which: (1) a blob or group of galaxies falling on to the main cluster, with the
gas in the impact region probably hotter and the galaxies in that zone showing
enhanced star formation; (2) a filament, either diffuse or made of small groups
of galaxies, extending at least 4 Mpc from the cluster (Durret et al. 1998).
Preliminary results obtained from XMM-Newton and Chandra observations of Abell
85 and its filament will be presented.

Astrophysics