A shock front at the radio relic of Abell 2744
MetadataShow full item record
Radio relics are Mpc-scale diffuse radio sources at the peripheries of galaxy clusters which are thought to trace outgoing merger shocks. We present XMM-Newton and Suzaku observations of the galaxy cluster Abell 2744 (z = 0.306), which reveal the presence of a shock front 1.5 Mpc east of the cluster core. The surface-brightness jump coincides with the position of a known radio relic. Although the surface-brightness jump indicates a weak shock with a Mach number M=1.7-0.3+0.5, the plasma in the post-shock region has been heated to a very high temperature (~13 keV) by the passage of the shock wave. The low-acceleration efficiency expected from such a weak shock suggests that mildly relativistic electrons have been re-accelerated by the passage of the shock front.
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Showing items related by title, author, creator and subject.
A powerful double radio relic system discovered in PSZ1 G108.18-11.53: Evidence for a shock with non-uniform Mach number?de Gasperin, F.; Intema, Hubertus; van Weeren, R.; Dawson, W.; Golovich, N.; Wittman, D.; Bonafede, A.; Brüggen, M. (2015)Diffuse radio emission in the form of radio haloes and relics has been found in a number of merging galaxy clusters. These structures indicate that shock and turbulence associated with the merger accelerate electrons to ...
Hoang, D.; Shimwell, T.; Stroe, A.; Akamatsu, H.; Brunetti, G.; Donnert, J.; Intema, Hubertus; Mulcahy, D.; Röttgering, H.; van Weeren, R.; Bonafede, A.; Brüggen, M.; Cassano, R.; Chyzy, K.; Enßlin, T.; Ferrari, C.; de Gasperin, F.; Gu, L.; Hoeft, M.; Miley, G.; Orrú, E.; Pizzo, R.; White, G. (2017)Previous studies have shown that CIZA J2242.8+5301 (the 'Sausage' cluster, z = 0.192) is a massive merging galaxy cluster that hosts a radio halo and multiple relics. In this paper, we present deep, high-fidelity, ...
Van Weeren, R.; Brunetti, G.; Brüggen, M.; Andrade-Santos, F.; Ogrean, G.; Williams, W.; Röttgering, H.; Dawson, W.; Forman, W.; Gasperin, F.; Hardcastle, M.; Jones, C.; Miley, G.; Rafferty, D.; Rudnick, L.; Sabater, J.; Sarazin, C.; Shimwell, T.; Bonafede, A.; Best, P.; Birzan, L.; Cassano, R.; Chyzy, K.; Croston, J.; Dijkema, T.; Enßlin, T.; Ferrari, C.; Heald, G.; Hoeft, M.; Horellou, C.; Jarvis, M.; Kraft, R.; Mevius, M.; Intema, Hubertus; Murray, S.; Orrú, E.; Pizzo, R.; Sridhar, S.; Simionescu, A.; Stroe, A.; Tol, S.; White, G. (2016)© 2016. The American Astronomical Society. All rights reserved.. We present deep LOFAR observations between 120 and 181 MHz of the "Toothbrush" (RX J0603.3+4214), a cluster that contains one of the brightest radio relic ...