Diffusive shock acceleration induced by a cluster merger?

Details Diffusive shock acceleration induced by a cluster merger? Diffusive shock acceleration induced by a cluster merger?

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop..147r&link_type=abstract

XMM-Newton Proposal ID #06540301

Physics

Groups Of Galaxies, Clusters Of Galaxies, Supercluster, Ciza J2242.8+53

Scientific paper

We have discovered an extraordinarily long, narrow steep spectrum radio relic in the galaxy cluster CIZA J2242.8+5301. The relic has a remarkable radio spectral index gradient perpendicular to its long axis and polarization points to a magnetic field parallel to it. Here we propose deep X-ray observations to (i) confirm the presence of a shock front at the position of the radio relic, (ii) determine the shock physical conditions, (iii) characterize the dynamical state of the cluster, and (iv) map the temperature distribution. These observations will (i) provide conclusive evidence for the existence of diffusive shock acceleration and, (ii) constrain scenarios connecting the properties of shock fronts, particle acceleration mechanisms, and the occurrence of radio relics.

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