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Title:
X-ray observations of the galaxy cluster PKS0745-191: to the virial radius, and beyond
Authors:
George, M. R.; Fabian, A. C.; Sanders, J. S.; Young, A. J.; Russell, H. R.
Affiliation:
AA(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AB(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AC(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AD(H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL), AE(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 395, Issue 2, pp. 657-666. (MNRAS Homepage)
Publication Date:
05/2009
Origin:
MNRAS
MNRAS Keywords:
galaxies: clusters: general , galaxies: clusters: individual: PKS0745-191 , X-rays: galaxies: clusters
DOI:
10.1111/j.1365-2966.2009.14547.x
Bibliographic Code:
2009MNRAS.395..657G

Abstract

We measure X-ray emission from the outskirts of the cluster of galaxies PKS0745-191 with Suzaku, determining radial profiles of density, temperature, entropy, gas fraction and mass. These measurements extend beyond the virial radius for the first time, providing new information about cluster assembly and the diffuse intracluster medium out to ~1.5r200(r200 ~= 1.7Mpc ~= 15arcmin). The temperature is found to decrease by roughly 70 per cent from 0.3 to 1r200. We also see a flattening of the entropy profile near the virial radius and consider the implications this has for the assumption of hydrostatic equilibrium when deriving mass estimates. We place these observations in the context of simulations and analytical models to develop a better understanding of non-gravitational physics in the outskirts of the cluster.
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