A shock front at the radio relic of Abell 2744
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...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
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Oxford University Press
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/74604 |
| _version_ | 1848763321656803328 |
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| author | Eckert, D. Jauzac, M. Vazza, F. Owers, M. Kneib, J. Tchernin, C. Intema, Hubertus Knowles, K. |
| author_facet | Eckert, D. Jauzac, M. Vazza, F. Owers, M. Kneib, J. Tchernin, C. Intema, Hubertus Knowles, K. |
| author_sort | Eckert, D. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T11:01:36Z |
| format | Journal Article |
| id | curtin-20.500.11937-74604 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T11:01:36Z |
| publishDate | 2016 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-746042019-03-13T03:34:24Z A shock front at the radio relic of Abell 2744 Eckert, D. Jauzac, M. Vazza, F. Owers, M. Kneib, J. Tchernin, C. Intema, Hubertus Knowles, K. 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. 2016 Journal Article http://hdl.handle.net/20.500.11937/74604 10.1093/mnras/stw1435 Oxford University Press fulltext |
| spellingShingle | Eckert, D. Jauzac, M. Vazza, F. Owers, M. Kneib, J. Tchernin, C. Intema, Hubertus Knowles, K. A shock front at the radio relic of Abell 2744 |
| title | A shock front at the radio relic of Abell 2744 |
| title_full | A shock front at the radio relic of Abell 2744 |
| title_fullStr | A shock front at the radio relic of Abell 2744 |
| title_full_unstemmed | A shock front at the radio relic of Abell 2744 |
| title_short | A shock front at the radio relic of Abell 2744 |
| title_sort | shock front at the radio relic of abell 2744 |
| url | http://hdl.handle.net/20.500.11937/74604 |