1997/07/02 by G. B. Lima Neto, V. Pislar, Neto, G. B. Lima +7
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Scientific Research and Discoveries #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9707020
11 pages, 6 figures, 3 tables, LaTeX Accepted for publication in Astronomy & Astrophysics main journal
arxiv created 1997/07/02 · openalex publication_date 1997/07/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a new X-ray analysis mainly based on ROSAT HRI data. The HRI\nspatial resolution combined with an improved wavelet analysis method and with\ncomplementary radio and optical data provides new results compared to a\nprevious paper based on ROSAT PSPC data (Pislar et al. 1997). We use also\nredshift data in order to identify galaxies dynamically belonging to the main\nbody of the cluster and/or to superimposed substructures. Various kinds of\nemission are superimposed on a mean thermal X-ray emission due to the\nintra-cluster gas: a) an X-ray flux excess in the centre; b) a south blob,\npartially generated by individual galaxies. The mean velocity and velocity\ndispersion of the galaxies located in this region are the same as those of the\ncluster as a whole: it therefore does not seem to be a bound subgroup; c) West\nemission due to a foreground group with self-emission from a Seyfert galaxy\nlocated at the north-west; d) emission in the south-west due to inverse Compton\nemission associated to a very steep radio source (the remnant of an active\ngalactic nucleus). We have examined the possibility for the central peak to be\nan "unusual" galaxy, as assumed for the central galaxy of J2310-43 (Tananbaum\net al. 1997). We conclude on the existence of a cooling flow region, in which\nthe presence of at least three small features certainly related to cooler blobs\nis revealed by the wavelet analysis. We have performed a pixel-to-pixel\nmodelling of the double X-ray emission. The large scale emission component is\ncomparable to those derived from by the PSPC data and the small scale one is\ninterpreted as a cooling-flow. A multiphase gas model analysis leads to a mass\ndeposit of 50-150 M_ odot/yr.\n