A radio halo surrounding the Brightest Cluster Galaxy in RXCJ0232.2-4420: a mini-halo in transition ?
| Autor: | Kale, Ruta, Shende, Krishna M., Parekh, Viral |
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| Rok vydání: | 2019 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnrasl/slz061 |
| Popis: | Diffuse radio sources associated with the intra-cluster medium are direct probes of the cosmic ray electrons and magnetic fields. We report the discovery of a diffuse radio source in the galaxy cluster RXCJ0232.2-4420 (SPT-CL J0232-4421, $z=0.2836$) using 606 MHz observations with the Giant Metrewave Radio Telescope. The diffuse radio source surrounds the Brightest Cluster Galaxy in the cluster like typical radio mini-halos. However the total extent of it is $550\times800$ kpc$^{2}$, which is larger than mini-halos and similar to that of radio halos. The BCG itself is also a radio source with a marginally resolved core at $7''$ (30 kpc) resolution. We measure the 606 MHz flux density of the RH to be $52\pm5$ mJy. Assuming a spectral index of 1.3, the 1.4 GHz radio power is $4.5 \times 10^{24}$ W Hz$^{-1}$. The dynamical state of the cluster has been inferred to be "relaxed" and also as "complex" depending on the classification methods based on the morphology of the X-ray surface brightness. This system thus seems to be in the transition phase from a mini-halo to a radio halo. Comment: Accepted for publication in MNRAS Letters |
| Databáze: | arXiv |
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