The First Murchison Widefield Array low-frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667
We present the first Murchison Widefield Array observations of the well-known cluster of galaxies Abell 3667 (A3667) between 105 and 241 MHz. A3667 is one of the best known examples of a galaxy cluster hosting a double radio relic and has been reported to contain a faint radio halo and bridge. The o...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
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Oxford University Press
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/16482 |
| _version_ | 1848749189281873920 |
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| author | Hindson, L. Johnston-Hollitt, M. Hurley-Walker, Natasha Buckley, K. Morgan, John Carretti, E. Dwarakanath, K. Bell, M. Bernardi, G. Bhat, Ramesh Bowman, J. Briggs, F. Cappallo, R. Corey, B. Deshpande, A. Emrich, David Ewall-Wice, A. Feng, L. Gaensler, B. Goeke, R. Greenhill, L. Hazelton, B. Jacobs, D. Kaplan, D. Kasper, J. Kratzenberg, E. Kudryavtseva, N. Lenc, E. Lonsdale, C. Lynch, M. McWhirter, S. McKinley, B. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Pindor, B. Prabu, T. Procopio, P. Offringa, A. Riding, J. Rogers, A. Roshi, A. Shankar, N. Srivani, K. Subramanyan, R. Tingay, Steven Waterson, Mark Wayth, Randall Webster, R. Whitney, A. Williams, A. Williams, C. |
| author_facet | Hindson, L. Johnston-Hollitt, M. Hurley-Walker, Natasha Buckley, K. Morgan, John Carretti, E. Dwarakanath, K. Bell, M. Bernardi, G. Bhat, Ramesh Bowman, J. Briggs, F. Cappallo, R. Corey, B. Deshpande, A. Emrich, David Ewall-Wice, A. Feng, L. Gaensler, B. Goeke, R. Greenhill, L. Hazelton, B. Jacobs, D. Kaplan, D. Kasper, J. Kratzenberg, E. Kudryavtseva, N. Lenc, E. Lonsdale, C. Lynch, M. McWhirter, S. McKinley, B. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Pindor, B. Prabu, T. Procopio, P. Offringa, A. Riding, J. Rogers, A. Roshi, A. Shankar, N. Srivani, K. Subramanyan, R. Tingay, Steven Waterson, Mark Wayth, Randall Webster, R. Whitney, A. Williams, A. Williams, C. |
| author_sort | Hindson, L. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We present the first Murchison Widefield Array observations of the well-known cluster of galaxies Abell 3667 (A3667) between 105 and 241 MHz. A3667 is one of the best known examples of a galaxy cluster hosting a double radio relic and has been reported to contain a faint radio halo and bridge. The origin of radio haloes, relics and bridges is still unclear, however galaxy cluster merger seems to be an important factor. We clearly detect the north-west (NW) and south-east radio relics in A3667 and find an integrated flux density at 149 MHz of 28.1 ± 1.7 and 2.4 ± 0.1 Jy, respectively, with an average spectral index, between 120 and 1400 MHz, of −0.9 ± 0.1 for both relics. We find evidence of a spatial variation in the spectral index across the NW relic steepening towards the centre of the cluster, which indicates an ageing electron population. These properties are consistent with higher frequency observations. We detect emission that could be associated with a radio halo and bridge. However, due to the presence of poorly sampled large-scale Galactic emission and blended point sources we are unable to verify the exact nature of these features. |
| first_indexed | 2025-11-14T07:16:59Z |
| format | Journal Article |
| id | curtin-20.500.11937-16482 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:16:59Z |
| publishDate | 2014 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-164822017-09-13T15:43:29Z The First Murchison Widefield Array low-frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667 Hindson, L. Johnston-Hollitt, M. Hurley-Walker, Natasha Buckley, K. Morgan, John Carretti, E. Dwarakanath, K. Bell, M. Bernardi, G. Bhat, Ramesh Bowman, J. Briggs, F. Cappallo, R. Corey, B. Deshpande, A. Emrich, David Ewall-Wice, A. Feng, L. Gaensler, B. Goeke, R. Greenhill, L. Hazelton, B. Jacobs, D. Kaplan, D. Kasper, J. Kratzenberg, E. Kudryavtseva, N. Lenc, E. Lonsdale, C. Lynch, M. McWhirter, S. McKinley, B. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Pindor, B. Prabu, T. Procopio, P. Offringa, A. Riding, J. Rogers, A. Roshi, A. Shankar, N. Srivani, K. Subramanyan, R. Tingay, Steven Waterson, Mark Wayth, Randall Webster, R. Whitney, A. Williams, A. Williams, C. We present the first Murchison Widefield Array observations of the well-known cluster of galaxies Abell 3667 (A3667) between 105 and 241 MHz. A3667 is one of the best known examples of a galaxy cluster hosting a double radio relic and has been reported to contain a faint radio halo and bridge. The origin of radio haloes, relics and bridges is still unclear, however galaxy cluster merger seems to be an important factor. We clearly detect the north-west (NW) and south-east radio relics in A3667 and find an integrated flux density at 149 MHz of 28.1 ± 1.7 and 2.4 ± 0.1 Jy, respectively, with an average spectral index, between 120 and 1400 MHz, of −0.9 ± 0.1 for both relics. We find evidence of a spatial variation in the spectral index across the NW relic steepening towards the centre of the cluster, which indicates an ageing electron population. These properties are consistent with higher frequency observations. We detect emission that could be associated with a radio halo and bridge. However, due to the presence of poorly sampled large-scale Galactic emission and blended point sources we are unable to verify the exact nature of these features. 2014 Journal Article http://hdl.handle.net/20.500.11937/16482 10.1093/mnras/stu1669 Oxford University Press fulltext |
| spellingShingle | Hindson, L. Johnston-Hollitt, M. Hurley-Walker, Natasha Buckley, K. Morgan, John Carretti, E. Dwarakanath, K. Bell, M. Bernardi, G. Bhat, Ramesh Bowman, J. Briggs, F. Cappallo, R. Corey, B. Deshpande, A. Emrich, David Ewall-Wice, A. Feng, L. Gaensler, B. Goeke, R. Greenhill, L. Hazelton, B. Jacobs, D. Kaplan, D. Kasper, J. Kratzenberg, E. Kudryavtseva, N. Lenc, E. Lonsdale, C. Lynch, M. McWhirter, S. McKinley, B. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Pindor, B. Prabu, T. Procopio, P. Offringa, A. Riding, J. Rogers, A. Roshi, A. Shankar, N. Srivani, K. Subramanyan, R. Tingay, Steven Waterson, Mark Wayth, Randall Webster, R. Whitney, A. Williams, A. Williams, C. The First Murchison Widefield Array low-frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667 |
| title | The First Murchison Widefield Array low-frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667 |
| title_full | The First Murchison Widefield Array low-frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667 |
| title_fullStr | The First Murchison Widefield Array low-frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667 |
| title_full_unstemmed | The First Murchison Widefield Array low-frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667 |
| title_short | The First Murchison Widefield Array low-frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667 |
| title_sort | first murchison widefield array low-frequency radio observations of cluster scale non-thermal emission: the case of abell 3667 |
| url | http://hdl.handle.net/20.500.11937/16482 |