Abell 2142 at large scales: An extreme case for sloshing?
  We present results obtained with a new XMM-Newton observation of A2142, a
famous textbook example of cluster with multiple cold fronts, which has been
studied in detail with Chandra but whose large scale properties are presented
here for the first time. We report the discovery of a a new cold front, the
most distant one ever detected in a galaxy cluster, at about one Mpc from the
center to the SE. Residual images, thermodynamics and metal abundance maps are
qualitatively in agreement with predictions from numerical simulations of the
sloshing phenomenon. However, the scales involved are much larger, similarly to
what recently observed in the Perseus cluster. These results show that sloshing
is a cluster-wide phenomenon, not confined in the cores, which extends well
beyond the cooling region involving a large fraction of the ICM up to almost
half of the virial radius. The absence of a cool core and a newly discovered
giant radio halo in A2142, in spite of its relaxed X-ray morphology, suggest
that large scale sloshing, or the intermediate merger which caused it, may
trigger Mpc-scale radio emission and may lead to the disruption of the cluster
cool core
