A distant radio mini-halo in the phoenix galaxy cluster
We report the discovery of extended radio emission in the Phoenix cluster (SPT-CL J2344-4243, z = 0.596) with the Giant Metrewave Radio Telescope (GMRT) at 610 MHz. The diffuse emission extends over a region of at least 400-500 kpc and surrounds the central radio source of the Brightest Cluster Gala...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Journal Article |
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Institute of Physics Publishing
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/73868 |
| _version_ | 1848763119736717312 |
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| author | Van Weeren, R. Intema, Hubertus Lal, D. Andrade-Santos, F. Brüggen, M. De Gasperin, F. Forman, W. Hoeft, M. Jones, C. Nuza, S. Röttgering, H. Stroe, A. |
| author_facet | Van Weeren, R. Intema, Hubertus Lal, D. Andrade-Santos, F. Brüggen, M. De Gasperin, F. Forman, W. Hoeft, M. Jones, C. Nuza, S. Röttgering, H. Stroe, A. |
| author_sort | Van Weeren, R. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We report the discovery of extended radio emission in the Phoenix cluster (SPT-CL J2344-4243, z = 0.596) with the Giant Metrewave Radio Telescope (GMRT) at 610 MHz. The diffuse emission extends over a region of at least 400-500 kpc and surrounds the central radio source of the Brightest Cluster Galaxy, but does not appear to be directly associated with it. We classify the diffuse emission as a radio mini-halo, making it the currently most distant mini-halo known. Radio mini-halos have been explained by synchrotron emitting particles re-accelerated via turbulence, possibly induced by gas sloshing generated from a minor merger event. Chandra observations show a non-concentric X-ray surface brightness distribution, which is consistent with this sloshing interpretation. The mini-halo has a flux density of 17 ± 5 mJy, resulting in a 1.4 GHz radio power of (10.4 ± 3.5) × 1024 W Hz-1. The combined cluster emission, which includes the central compact radio source, is also detected in a shallow GMRT 156 MHz observation and together with the 610 MHz data we compute a spectral index of-0.84 ± 0.12 for the overall cluster radio emission. Given that mini-halos typically have steeper radio spectra than cluster radio galaxies, this spectral index should be taken as an upper limit for the mini-halo. © 2014. The American Astronomical Society. All rights reserved. |
| first_indexed | 2025-11-14T10:58:24Z |
| format | Journal Article |
| id | curtin-20.500.11937-73868 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:58:24Z |
| publishDate | 2014 |
| publisher | Institute of Physics Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-738682019-07-22T03:38:41Z A distant radio mini-halo in the phoenix galaxy cluster Van Weeren, R. Intema, Hubertus Lal, D. Andrade-Santos, F. Brüggen, M. De Gasperin, F. Forman, W. Hoeft, M. Jones, C. Nuza, S. Röttgering, H. Stroe, A. We report the discovery of extended radio emission in the Phoenix cluster (SPT-CL J2344-4243, z = 0.596) with the Giant Metrewave Radio Telescope (GMRT) at 610 MHz. The diffuse emission extends over a region of at least 400-500 kpc and surrounds the central radio source of the Brightest Cluster Galaxy, but does not appear to be directly associated with it. We classify the diffuse emission as a radio mini-halo, making it the currently most distant mini-halo known. Radio mini-halos have been explained by synchrotron emitting particles re-accelerated via turbulence, possibly induced by gas sloshing generated from a minor merger event. Chandra observations show a non-concentric X-ray surface brightness distribution, which is consistent with this sloshing interpretation. The mini-halo has a flux density of 17 ± 5 mJy, resulting in a 1.4 GHz radio power of (10.4 ± 3.5) × 1024 W Hz-1. The combined cluster emission, which includes the central compact radio source, is also detected in a shallow GMRT 156 MHz observation and together with the 610 MHz data we compute a spectral index of-0.84 ± 0.12 for the overall cluster radio emission. Given that mini-halos typically have steeper radio spectra than cluster radio galaxies, this spectral index should be taken as an upper limit for the mini-halo. © 2014. The American Astronomical Society. All rights reserved. 2014 Journal Article http://hdl.handle.net/20.500.11937/73868 10.1088/2041-8205/786/2/L17 Institute of Physics Publishing fulltext |
| spellingShingle | Van Weeren, R. Intema, Hubertus Lal, D. Andrade-Santos, F. Brüggen, M. De Gasperin, F. Forman, W. Hoeft, M. Jones, C. Nuza, S. Röttgering, H. Stroe, A. A distant radio mini-halo in the phoenix galaxy cluster |
| title | A distant radio mini-halo in the phoenix galaxy cluster |
| title_full | A distant radio mini-halo in the phoenix galaxy cluster |
| title_fullStr | A distant radio mini-halo in the phoenix galaxy cluster |
| title_full_unstemmed | A distant radio mini-halo in the phoenix galaxy cluster |
| title_short | A distant radio mini-halo in the phoenix galaxy cluster |
| title_sort | distant radio mini-halo in the phoenix galaxy cluster |
| url | http://hdl.handle.net/20.500.11937/73868 |