NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-07-16 T02:58:27 PDT
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For refcode 2015MNRAS.447.2497E:
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NED Abstract

Copyright by Royal Astronomical Society. 2015MNRAS.447.2497E Evidence for a pressure discontinuity at the position of the Coma relic from Planck Sunyaev-Zel'dovich effect data Erler, J.; Basu, K.; Trasatti, M.; Klein, U.; Bertoldi, F. Abstract. Radio relics are Mpc-scale diffuse synchrotron sources found in galaxy cluster outskirts. They are believed to be associated with large-scale shocks propagating through the intracluster medium, although the connection between radio relics and the cluster merger shocks is not yet proven conclusively. We present a first tentative detection of a pressure jump in the well-known relic of the Coma cluster through Sunyaev-Zel'dovich effect (SZE) imaging. The SZE data are extracted from the first public all-sky data release of Planck and we use high-frequency radio data at 2.3 GHz to constrain the shock-front geometry. The SZE data provide evidence for a pressure discontinuity, consistent with the relic position, without requiring any additional prior on the shock-front location. The derived Mach number M = 2.9^{+0.8}_{-0.6}_ is consistent with X-ray and radio results. A high-pressure 'filament' without any pressure discontinuity is disfavoured by X-ray measurements and a 'sub-cluster' model based on the infalling group NGC 4839 can be ruled out considering the published mass estimates for this group. These results signify a first attempt towards directly measuring the pressure discontinuity for a radio relic and the first SZE-detected shock feature observed near the virial radius of a galaxy cluster. Key words: radiation mechanisms: non-thermal, radiation mechanisms: thermal, shock waves, galaxies: clusters: general, galaxies: clusters: intracluster medium
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