Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies
Radio haloes are diffuse synchrotron sources on scales of ~1 Mpc that are found in merging clusters of galaxies, and are believed to be powered by electrons re-accelerated by mergerdriven turbulence. We present measurements of extended radio emission on similarly large scales in two clusters of gala...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
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Oxford University Press
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/73911 |
| _version_ | 1848763130634567680 |
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| author | Sommer, M. Basu, K. Intema, Hubertus Pacaud, F. Bonafede, A. Babul, A. Bertoldi, F. |
| author_facet | Sommer, M. Basu, K. Intema, Hubertus Pacaud, F. Bonafede, A. Babul, A. Bertoldi, F. |
| author_sort | Sommer, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Radio haloes are diffuse synchrotron sources on scales of ~1 Mpc that are found in merging clusters of galaxies, and are believed to be powered by electrons re-accelerated by mergerdriven turbulence. We present measurements of extended radio emission on similarly large scales in two clusters of galaxies hosting cool cores: Abell 2390 and Abell 2261. The analysis is based on interferometric imaging with the Karl G. Jansky Very Large Array, Very Large Array and Giant Metrewave Radio Telescope.We present detailed radio images of the targets, subtract the compact emission components and measure the spectral indices for the diffuse components. The radio emission in A2390 extends beyond a known sloshing-like brightness discontinuity, and has a very steep in-band spectral slope at 1.5 GHz that is similar to some known ultrasteep spectrum radio haloes. The diffuse signal in A2261 is more extended than in A2390 but has lower luminosity. X-ray morphological indicators, derived from XMM-Newton X-ray data, place these clusters in the category of relaxed or regular systems, although some asymmetric features that can indicate past minor mergers are seen in the X-ray brightness images. If these two Mpc-scale radio sources are categorized as giant radio haloes, they question the common assumption of radio haloes occurring exclusively in clusters undergoing violent merging activity, in addition to commonly used criteria for distinguishing between radio haloes and minihaloes. |
| first_indexed | 2025-11-14T10:58:34Z |
| format | Journal Article |
| id | curtin-20.500.11937-73911 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:58:34Z |
| publishDate | 2017 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-739112019-03-13T00:59:17Z Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies Sommer, M. Basu, K. Intema, Hubertus Pacaud, F. Bonafede, A. Babul, A. Bertoldi, F. Radio haloes are diffuse synchrotron sources on scales of ~1 Mpc that are found in merging clusters of galaxies, and are believed to be powered by electrons re-accelerated by mergerdriven turbulence. We present measurements of extended radio emission on similarly large scales in two clusters of galaxies hosting cool cores: Abell 2390 and Abell 2261. The analysis is based on interferometric imaging with the Karl G. Jansky Very Large Array, Very Large Array and Giant Metrewave Radio Telescope.We present detailed radio images of the targets, subtract the compact emission components and measure the spectral indices for the diffuse components. The radio emission in A2390 extends beyond a known sloshing-like brightness discontinuity, and has a very steep in-band spectral slope at 1.5 GHz that is similar to some known ultrasteep spectrum radio haloes. The diffuse signal in A2261 is more extended than in A2390 but has lower luminosity. X-ray morphological indicators, derived from XMM-Newton X-ray data, place these clusters in the category of relaxed or regular systems, although some asymmetric features that can indicate past minor mergers are seen in the X-ray brightness images. If these two Mpc-scale radio sources are categorized as giant radio haloes, they question the common assumption of radio haloes occurring exclusively in clusters undergoing violent merging activity, in addition to commonly used criteria for distinguishing between radio haloes and minihaloes. 2017 Journal Article http://hdl.handle.net/20.500.11937/73911 10.1093/mnras/stw3015 Oxford University Press fulltext |
| spellingShingle | Sommer, M. Basu, K. Intema, Hubertus Pacaud, F. Bonafede, A. Babul, A. Bertoldi, F. Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies |
| title | Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies |
| title_full | Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies |
| title_fullStr | Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies |
| title_full_unstemmed | Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies |
| title_short | Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies |
| title_sort | mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies |
| url | http://hdl.handle.net/20.500.11937/73911 |