The rich cluster of galaxies ABCG 85
II. X-ray analysis using the ROSAT HRI *
G.B. Lima Neto 1, 2,
V. Pislar 1,
F. Durret 1, 3,
D. Gerbal 1, 3 and
E. Slezak 4
Received 7 May 1997 / Accepted 17 June 1997
We present a new X-ray analysis mainly based on ROSAT HRI data. The HRI spatial resolution combined with an improved wavelet analysis method and with complementary radio and optical data provides new results compared to a previous paper based on ROSAT PSPC data (Pislar et al. 1997). We use also redshift data in order to identify galaxies dynamically belonging to the main body of the cluster and/or to superimposed substructures.
Various kinds of emission are superimposed on a mean thermal X-ray
emission due to the intra-cluster gas:
We have examined the possibility for the central peak to be an "unusual" galaxy, as assumed for the central galaxy of J2310-43 (Tananbaum et al. 1997). We conclude on the existence of a cooling flow region, in which the presence of at least three small features certainly related to cooler blobs is revealed by the wavelet analysis.
We have performed a pixel-to-pixel modelling of the double X-ray emission. The large 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 .
Key words: galaxies: clusters: general; clusters: individual: ABCG 85 cooling flows X-rays: galaxies
Send offprint requests to: G.B. Lima Neto, firstname.lastname@example.org
© European Southern Observatory (ESO) 1997
Online publication: April 8, 1998