Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-07-08
2009, MNRAS, vol. 395, 657
Astronomy and Astrophysics
Astrophysics
10 pages, 11 figures, accepted to MNRAS; expanded discussion of analysis and uncertainties, results qualitatively unchanged
Scientific paper
10.1111/j.1365-2966.2009.14547.x
We measure X-ray emission from the outskirts of the cluster of galaxies PKS 0745-191 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 ~1.5 r_200, (r_200 ~ 1.7 Mpc ~ 15'). The temperature is found to decrease by roughly 70 per cent from 0.3-1 r_200. 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.
Fabian Andrew C.
George Matthew R.
Russell Helen R.
Sanders Jeremy S.
Young Andrew J.
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