Deep VLA Observations of the Cluster 1RXS J0603.3+4214 in the Frequency Range of 1-2 GHz
We report L-band VLA observations of 1RXS J0603.3+4214, a cluster that hosts a bright radio relic, known as the Toothbrush, and an elongated giant radio halo. These new observations allow us to study the surface brightness distribution down to 1 arcsec resolution with very high sensitivity. Our imag...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Published: |
Institute of Physics Publishing
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/73680 |
| _version_ | 1848763069876928512 |
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| author | Rajpurohit, K. Hoeft, M. Van Weeren, R. Rudnick, L. Röttgering, H. Forman, W. Brüggen, M. Croston, J. Andrade-Santos, F. Dawson, W. Intema, Hubertus Kraft, R. Jones, C. Jee, M. |
| author_facet | Rajpurohit, K. Hoeft, M. Van Weeren, R. Rudnick, L. Röttgering, H. Forman, W. Brüggen, M. Croston, J. Andrade-Santos, F. Dawson, W. Intema, Hubertus Kraft, R. Jones, C. Jee, M. |
| author_sort | Rajpurohit, K. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We report L-band VLA observations of 1RXS J0603.3+4214, a cluster that hosts a bright radio relic, known as the Toothbrush, and an elongated giant radio halo. These new observations allow us to study the surface brightness distribution down to 1 arcsec resolution with very high sensitivity. Our images provide an unprecedented detailed view of the Toothbrush, revealing enigmatic filamentary structures. To study the spectral index distribution, we complement our analysis with published LOFAR and GMRT observations. The bright "brush" of the Toothbrush shows a prominent narrow ridge to its north with a sharp outer edge. The spectral index at the ridge is in the range -0.70 = a = -0.80. We suggest that the ridge is caused by projection along the line of sight. With a simple toy model for the smallest region of the ridge, we conclude that the magnetic field is below 5 µG and varies significantly across the shock front. Our model indicates that the actual Mach number is higher than that obtained from the injection index and agrees well with the one derived from the overall spectrum, namely M = 3.78+0.3-0.2. The radio halo shows an average spectral index of a = -1.16 ±0.05 and a slight gradient from north to south. The southernmost part of the halo is steeper and possibly related to a shock front. Excluding the southernmost part, the halo morphology agrees very well with the X-ray morphology. A power-law correlation is found between the radio and X-ray surface brightness. |
| first_indexed | 2025-11-14T10:57:36Z |
| format | Journal Article |
| id | curtin-20.500.11937-73680 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:57:36Z |
| publishDate | 2018 |
| publisher | Institute of Physics Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-736802019-07-22T03:29:16Z Deep VLA Observations of the Cluster 1RXS J0603.3+4214 in the Frequency Range of 1-2 GHz Rajpurohit, K. Hoeft, M. Van Weeren, R. Rudnick, L. Röttgering, H. Forman, W. Brüggen, M. Croston, J. Andrade-Santos, F. Dawson, W. Intema, Hubertus Kraft, R. Jones, C. Jee, M. We report L-band VLA observations of 1RXS J0603.3+4214, a cluster that hosts a bright radio relic, known as the Toothbrush, and an elongated giant radio halo. These new observations allow us to study the surface brightness distribution down to 1 arcsec resolution with very high sensitivity. Our images provide an unprecedented detailed view of the Toothbrush, revealing enigmatic filamentary structures. To study the spectral index distribution, we complement our analysis with published LOFAR and GMRT observations. The bright "brush" of the Toothbrush shows a prominent narrow ridge to its north with a sharp outer edge. The spectral index at the ridge is in the range -0.70 = a = -0.80. We suggest that the ridge is caused by projection along the line of sight. With a simple toy model for the smallest region of the ridge, we conclude that the magnetic field is below 5 µG and varies significantly across the shock front. Our model indicates that the actual Mach number is higher than that obtained from the injection index and agrees well with the one derived from the overall spectrum, namely M = 3.78+0.3-0.2. The radio halo shows an average spectral index of a = -1.16 ±0.05 and a slight gradient from north to south. The southernmost part of the halo is steeper and possibly related to a shock front. Excluding the southernmost part, the halo morphology agrees very well with the X-ray morphology. A power-law correlation is found between the radio and X-ray surface brightness. 2018 Journal Article http://hdl.handle.net/20.500.11937/73680 10.3847/1538-4357/aa9f13 Institute of Physics Publishing fulltext |
| spellingShingle | Rajpurohit, K. Hoeft, M. Van Weeren, R. Rudnick, L. Röttgering, H. Forman, W. Brüggen, M. Croston, J. Andrade-Santos, F. Dawson, W. Intema, Hubertus Kraft, R. Jones, C. Jee, M. Deep VLA Observations of the Cluster 1RXS J0603.3+4214 in the Frequency Range of 1-2 GHz |
| title | Deep VLA Observations of the Cluster 1RXS J0603.3+4214 in the Frequency Range of 1-2 GHz |
| title_full | Deep VLA Observations of the Cluster 1RXS J0603.3+4214 in the Frequency Range of 1-2 GHz |
| title_fullStr | Deep VLA Observations of the Cluster 1RXS J0603.3+4214 in the Frequency Range of 1-2 GHz |
| title_full_unstemmed | Deep VLA Observations of the Cluster 1RXS J0603.3+4214 in the Frequency Range of 1-2 GHz |
| title_short | Deep VLA Observations of the Cluster 1RXS J0603.3+4214 in the Frequency Range of 1-2 GHz |
| title_sort | deep vla observations of the cluster 1rxs j0603.3+4214 in the frequency range of 1-2 ghz |
| url | http://hdl.handle.net/20.500.11937/73680 |