THE RICH CLUSTER OF GALAXIES ABCG-85 .2. X-RAY-ANALYSIS USING THE ROSAT HRI

We present a new X-ray analysis mainly based on ROSAT HRI data. The HR I spatial resolution combined with an improved wavelet analysis method and with complementary radio and optical data provides new results co mpared to a previous paper based on ROSAT PSPC data (Pislar et al. 199 7). We use also redshift data in order to identify galaxies dynamicall y belonging to the main body of the cluster and/or to superimposed sub structures. Various kinds of emission are superimposed on a mean therm al X-ray emission due to intra-cluster gas: an X-ray flux excess in th e centre at a scale of 15-25 kpc; a south blob, partially generated by individual galaxies (such as the second brightest galaxy); the mean v elocity and velocity dispersion of the galaxies located in this region are the same as those of the cluster as a whole: it therefore does no t seem to be a bound subgroup; West emission due to a foreground group with self-emission from a Seyfert galaxy located at the north-west; e mission in the south-west due to inverse Compton emission associated t o a very steep radio source (the remnant of an active galactic nucleus ). We have examined the possibility for the central peak to be an ''un usual'' galaxy, as assumed for the central galaxy of J2310-43 (Tananba um et al. 1997). We conclude on the existence of a cooling flow region , in which the presence of at least three small features certainly rel ated to cooler blobs is revealed by the wavelet analysis. We have perf ormed a pixel-to-pixel modelling of the double X-ray emission. The lar ge scale emission component is comparable to those derived from by the PSPC data and the small scale one is interpreted as a cooling-flow. A multiphase gas model analysis leads to a mass deposit of 50-150 M./yr .