The merging cluster Abell 85 caught between meals by XMM-Newton

Details The merging cluster Abell 85 caught between meals by XMM-Newton The merging cluster Abell 85 caught between meals by XMM-Newton

2005-01-12

arxiv.org/abs/astro-ph/0501214v1

Astronomy and Astrophysics

Astrophysics

Contribution to the Proceedings of the COSPAR Scientific Assembly, E1.2 "Clusters of Galaxies: New Insights from XMM-Newton, C

Scientific paper

10.1016/j.asr.2005.01.035

Our XMM-Newton observations of Abell 85 confirm the extended 4 Mpc filament first detected with ROSAT, which has an X-ray temperature of about 2 keV and is probably made of groups falling on to the cluster. A comparison of the temperature map with numerical simulations show that Abell 85 had intense merging activity in the past and is not fully relaxed, even in the central region. Finally, a deprojected temperature profile has been calculated and used, together with the suface brightness, to estimate the entropy and pressure profiles. Abell 85 only presents a mild flattening of the entropy profile in the center, showing no evidence of an ``entropy floor''.

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