Discovery of large-scale diffuse radio emission in low-mass galaxy cluster Abell 1931
Extended, steep-spectrum radio synchrotron sources are pre-dominantly found in massive galaxy clusters as opposed to groups. LOFAR Two-Metre Sky Survey images have revealed a diffuse, ultra-steep-spectrum radio source in the low-mass cluster Abell 1931. The source has a fairly irregular morphology w...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Journal Article |
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Oxford University Press
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/74598 |
| _version_ | 1848763320095473664 |
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| author | Brüggen, M. Bonafede, A. van Weeren, R. Shimwell, T. Intema, Hubertus Röttgering, H. Brunetti, G. Di Gennaro, G. Savini, F. Wilber, A. O'Sullivan, S. Ensslin, T. De Gasperin, F. Hoeft, M. |
| author_facet | Brüggen, M. Bonafede, A. van Weeren, R. Shimwell, T. Intema, Hubertus Röttgering, H. Brunetti, G. Di Gennaro, G. Savini, F. Wilber, A. O'Sullivan, S. Ensslin, T. De Gasperin, F. Hoeft, M. |
| author_sort | Brüggen, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Extended, steep-spectrum radio synchrotron sources are pre-dominantly found in massive galaxy clusters as opposed to groups. LOFAR Two-Metre Sky Survey images have revealed a diffuse, ultra-steep-spectrum radio source in the low-mass cluster Abell 1931. The source has a fairly irregular morphology with the largest linear size of about 550 kpc. The source is only seen in LOFAR observations at 143 MHz and Giant Metre Radio Telescope observations at 325 MHz. The spectral index of the total source between 143 and 325 MHz is a 143325 = -2.86 ± 0.36. The source remains invisible in Very Large Array (1-2 GHz) observations as expected given the spectral index. Chandra X-ray observations of the cluster revealed a bolometric luminosity of LX =(1.65±0.39)×1043 erg s-1 and a temperature of 2.92-0.87+1.89 keV which implies a mass of around ~1014 M?. We conclude that the source is a remnant radio galaxy that has shut off around 200 Myr ago. The brightest cluster galaxy, a radio-loud elliptical galaxy, could be the source for this extinct source. Unlike remnant sources studied in the literature, our source has a steep spectrum at low radio frequencies. Studying such remnant radio galaxies at low radio frequencies is important for understanding the scarcity of such sources and their role in feedback processes. |
| first_indexed | 2025-11-14T11:01:35Z |
| format | Journal Article |
| id | curtin-20.500.11937-74598 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T11:01:35Z |
| publishDate | 2018 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-745982019-03-13T03:30:10Z Discovery of large-scale diffuse radio emission in low-mass galaxy cluster Abell 1931 Brüggen, M. Bonafede, A. van Weeren, R. Shimwell, T. Intema, Hubertus Röttgering, H. Brunetti, G. Di Gennaro, G. Savini, F. Wilber, A. O'Sullivan, S. Ensslin, T. De Gasperin, F. Hoeft, M. Extended, steep-spectrum radio synchrotron sources are pre-dominantly found in massive galaxy clusters as opposed to groups. LOFAR Two-Metre Sky Survey images have revealed a diffuse, ultra-steep-spectrum radio source in the low-mass cluster Abell 1931. The source has a fairly irregular morphology with the largest linear size of about 550 kpc. The source is only seen in LOFAR observations at 143 MHz and Giant Metre Radio Telescope observations at 325 MHz. The spectral index of the total source between 143 and 325 MHz is a 143325 = -2.86 ± 0.36. The source remains invisible in Very Large Array (1-2 GHz) observations as expected given the spectral index. Chandra X-ray observations of the cluster revealed a bolometric luminosity of LX =(1.65±0.39)×1043 erg s-1 and a temperature of 2.92-0.87+1.89 keV which implies a mass of around ~1014 M?. We conclude that the source is a remnant radio galaxy that has shut off around 200 Myr ago. The brightest cluster galaxy, a radio-loud elliptical galaxy, could be the source for this extinct source. Unlike remnant sources studied in the literature, our source has a steep spectrum at low radio frequencies. Studying such remnant radio galaxies at low radio frequencies is important for understanding the scarcity of such sources and their role in feedback processes. 2018 Journal Article http://hdl.handle.net/20.500.11937/74598 10.1093/mnras/sty851 Oxford University Press fulltext |
| spellingShingle | Brüggen, M. Bonafede, A. van Weeren, R. Shimwell, T. Intema, Hubertus Röttgering, H. Brunetti, G. Di Gennaro, G. Savini, F. Wilber, A. O'Sullivan, S. Ensslin, T. De Gasperin, F. Hoeft, M. Discovery of large-scale diffuse radio emission in low-mass galaxy cluster Abell 1931 |
| title | Discovery of large-scale diffuse radio emission in low-mass galaxy cluster Abell 1931 |
| title_full | Discovery of large-scale diffuse radio emission in low-mass galaxy cluster Abell 1931 |
| title_fullStr | Discovery of large-scale diffuse radio emission in low-mass galaxy cluster Abell 1931 |
| title_full_unstemmed | Discovery of large-scale diffuse radio emission in low-mass galaxy cluster Abell 1931 |
| title_short | Discovery of large-scale diffuse radio emission in low-mass galaxy cluster Abell 1931 |
| title_sort | discovery of large-scale diffuse radio emission in low-mass galaxy cluster abell 1931 |
| url | http://hdl.handle.net/20.500.11937/74598 |