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For refcode 1996A&A...311..413P:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1996A&A...311..413P X-ray analysis and matter distribution in the lens-cluster Abell 2390 M. Pierre, J.F. Le Borgne, G. Soucail, and J.P. Kneib CEA Saclay DSM/DAPNIA/SAp, Service d'Astrophysique, F-91 191 Gif-sur- Yvette, France Observatoire Midi-Pyrenee's, Laboratoire d'Astrophysique de Toulouse, URA 285,14 Avenue E. Belin, F-3 1400 Toulouse, France Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK Received 7 August 1995/Accepted 2 January 1996 Abstract. We present a deep X-ray ROSAT/HRI observation of the rich lensing cluster Abell 2390 as well as the analysis of the gas and matter distribution in the cluster. The X-ray centroid coincides with the location of the central cD galaxy, and the core appears to be dominated by a massive cooling flow, one of the strongest ever studied. On larger scales, the X-ray distribution is elliptical and locally distorted by a significant "sub-structure", which is located some 100 h^-1^ kpc from the center. The mass of this sub-structure is estimated to be ~1/15 of the total cluster mass and appears to be associated with an enhancement in the galaxy distribution, in the region where the giant "straight arc" and several arclets are observed. A simple lens model based on the geometrical properties of the X-ray gas shows that this sub-structure allows a simple explanation of the peculiar shape of the arc and puts strong constraints on the total mass distribution in the central part of this cluster. The derived M/L in the central part of the cluster is found to be around 250 in solar units, a rather common value compared with other cluster-lenses. Moreover, the link between the matter distribution derived from the lens model and the density profile obtained from the X- ray map analysis is used to infer the temperature profile in the cluster. This profile shows a significant decrease near the center, in agreement with the existence of the cooling flow. Both X-ray and lensing constraints are combined together to give a consistent picture of the dynamics of the central part of A2390. Key words: galaxies: clustering - galaxies: cluster: individual Abell 2390 - cosmology: observations - dark matter - gravitational lensing - X-rays: galaxies
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